−---
−title: Fencing and Gates
−category: Sitework
−toc_depth: 3
−description: >
− When to use: Site perimeter, security, and screening fencing and gates for commercial, institutional, and industrial projects, including galvanized and polymer-coated chain-link fence systems, ornamental tubular steel and aluminum picket fence, welded-wire mesh security fence, posts and concrete footings, top and bottom rails and tension wire, barbed-wire and razor-ribbon outriggers, single and double swing gates, cantilever and overhead-slide vehicular gates, pedestrian gates, automated vehicular gate operators listed to UL 325, the gate construction and entrapment-protection requirements of ASTM F2200, and gate hardware including hinges, latches, and provisions for access control and electric locking hardware furnished by others. Intended to be read alongside the civil site plan and fence layout drawings, which govern fence lines, heights, gate locations and swings, and grade conditions.
− Not intended for: Wood, vinyl, composite, and chain-link residential fencing for single-family use; agricultural and field fencing (woven-wire, high-tensile, electric livestock fence); guardrail, crash-rated anti-ram vehicle barriers, bollards, and crash-rated gates certified to ASTM F2656 (those require a project-specific perimeter-security specification); retaining walls and freestanding masonry or concrete screen walls (see [[sync/cast-in-place-concrete]]); handrails and guards on stairs and ramps; sound barrier walls; sports-netting and backstop systems beyond standard chain-link; expansion-joint and structural detailing of the foundations themselves (see [[sync/cast-in-place-concrete]]); and the access-control head end, credential readers, intercoms, and gate-controller logic (see [[sync/access-control-systems]]). Earthwork, grading, and subgrade beneath fence lines and gate slabs are covered by [[sync/earthwork]].
−---
−
−# Scope
−
−This specification covers the materials, fabrication, and installation of site perimeter, security, and screening fencing and the associated swing, slide, and pedestrian gates, including automated vehicular gate operators and their entrapment-protection systems. Fencing is frequently treated as an afterthought scope, installed late and detailed thinly, yet it is the most visible boundary of a completed project and, where it serves a security function, it is a life-safety and liability element. A fence that is the wrong height, set on inadequate footings, or fitted with an automated gate that does not comply with current entrapment-protection standards is a defect that is both conspicuous and, in the case of gate operators, potentially dangerous.
−
−This standard addresses chain-link fence systems including framework pipe, fabric, rails, tension wire, and fittings; ornamental tubular steel and aluminum picket fence; welded-wire mesh security fence; barbed-wire, barbed-tape, and razor-ribbon toppings; post types, spacing, and concrete footings; single and double swing gates; cantilever and overhead-slide vehicular gates; pedestrian gates; automated vehicular gate operators; the gate construction and safety requirements that govern automated gates; and gate hardware. The selection of fence type, height, line, and gate locations is established by the contract drawings and is project-specific; this standard governs how the selected systems are built and installed.
−
−All work under this specification shall conform to the fence lines, heights, gate locations, gate swings, and grade conditions shown on the contract drawings. Where this standard and the drawings or the geotechnical report conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing. The Contractor shall coordinate fence and gate work with [[sync/earthwork]] for grading and subgrade along fence lines and at gate slabs, with [[sync/cast-in-place-concrete]] for post footings and gate operator pads where cast-in-place concrete is specified, and with [[sync/access-control-systems]] for the conduit, power, control wiring, credential readers, and gate-controller logic that interface with automated gate operators and electric gate locks.
−
−# Referenced Standards
−
−Materials, fabrication, testing, and installation shall comply with the latest adopted edition of the following standards. Where project documents, adopted codes, and referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
−
−| Standard | Title |
−|----------|-------|
−| ASTM A392 | Standard Specification for Zinc-Coated Steel Chain-Link Fence Fabric |
−| ASTM F668 | Standard Specification for Polyvinyl Chloride (PVC), Polyolefin, and Other Polymer-Coated Steel Chain-Link Fence Fabric |
−| ASTM F1083 | Standard Specification for Pipe, Steel, Hot-Dipped Zinc-Coated (Galvanized) Welded, for Fence Structures |
−| ASTM F1043 | Standard Specification for Strength and Protective Coatings on Steel Industrial Fence Framework |
−| ASTM F1234 | Standard Specification for Protective Coatings on Steel Framework for Fences (round and roll-formed sections) |
−| ASTM F626 | Standard Specification for Fence Fittings |
−| ASTM A121 | Standard Specification for Metallic-Coated Carbon Steel Barbed Wire |
−| ASTM F1665 | Standard Specification for Polyvinyl Chloride (PVC) and Other Conforming Organic Polymer-Coated Steel Barbed Wire |
−| ASTM F900 | Standard Specification for Industrial and Commercial Swing Gates |
−| ASTM F1184 | Standard Specification for Industrial and Commercial Horizontal Slide Gates |
−| ASTM F2408 | Standard Specification for Ornamental Fences Employing Galvanized Steel Tubular Pickets |
−| ASTM F2589 | Standard Specification for Ornamental Fences Employing Galvanized Steel Tubular Pickets, Heavy and High-Security Grades |
−| ASTM F2453 | Standard Specification for Welded Wire Mesh Fence Fabric (Metallic-Coated or Polymer Coated) for Meshes of 6 in² or Less, in Panels or Rolls, with Uniform Meshes |
−| ASTM F2611 | Standard Guide for the Design and Construction of Chain Link Security Fencing |
−| ASTM F2814 | Standard Guide for Design and Construction of Ornamental Steel Picket Fence Systems for Security Purposes |
−| ASTM F567 | Standard Practice for Installation of Chain-Link Fence |
−| ASTM A123/A123M | Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products |
−| ASTM A153/A153M | Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware |
−| ASTM A780/A780M | Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings |
−| UL 325 | Standard for Door, Drapery, Gate, Louver, and Window Operators and Systems |
−| ASTM F2200 | Standard Specification for Automated Vehicular Gate Construction |
−| ASTM F2656/F2656M | Standard Test Method for Crash Testing of Vehicle Security Barriers (referenced for exclusions only) |
−
−Note on framework coating standards: ASTM F1083 governs the steel pipe itself (the most common chain-link and gate framework material). ASTM F1043 governs the strength and protective-coating classes of industrial fence framework and references F1083 Group IA as its benchmark. ASTM F1234 covers protective coatings on roll-formed and lighter framework sections. These standards are complementary, not alternatives, and the correct combination is identified in the framework sections of this standard.
−
−# Submittals
−
−## Action Submittals
−
−The Contractor shall submit the following for the Engineer of Record's review before fabricating or delivering any fence or gate materials. Fabrication shall not begin until the submittals are reviewed and returned. Submittal review does not relieve the Contractor of responsibility for compliance with the contract documents.
−
−- Product data for fence fabric, framework, fittings, gates, gate hardware, and gate operators, identifying the governing ASTM standard, coating class, gauge or wall thickness, and finish for each component
−- Shop drawings showing fence elevations, post types and spacing, footing details and embedment depths, gate elevations and swings or travel, brace and truss arrangements, grounding details, and the location of every line, terminal, corner, end, gate, and pull post keyed to the site plan
−- Gate operator data: manufacturer's installation instructions, the UL 325 listing and the operator usage class (Class I through Class IV), the entrapment-protection means provided in each direction of travel, and the wiring and interface schedule for power, control, and access-control connections
−- ASTM F2200 gate construction compliance statement for each automated gate leaf, identifying how each construction requirement (mesh openings, exposed-roller covers, guarding of pinch and entrapment zones, restraint against falling) is satisfied
−- Galvanizing and coating certifications: mill or applicator certification of zinc coating weights for fabric (ASTM A392), framework (ASTM F1043/F1083), fittings (ASTM F626 / A153), and polymer-coating class and color where polymer-coated materials are specified (ASTM F668)
−- Concrete mix design or product data for post footing concrete, coordinated with [[sync/cast-in-place-concrete]]
−
−```datasheet
−label: Action Submittals Required
−type: checkbox
−options:
− - "Product data (fabric, framework, fittings, gates, hardware, operators)"
− - "Shop drawings (elevations, post schedule, footings, gate swings/travel, grounding)"
− - "Gate operator data (UL 325 listing, usage class, entrapment means, wiring)"
− - "ASTM F2200 gate construction compliance statement"
− - "Galvanizing / polymer-coating certifications"
− - "Footing concrete mix design / product data"
−default: "Product data (fabric, framework, fittings, gates, hardware, operators)"
−```
−
−## Closeout Submittals
−
−Prior to substantial completion the Contractor shall provide the following:
−
−- Operation and maintenance manuals for gate operators, including the maintenance schedule, the procedure for periodic testing of entrapment-protection devices, and the manual-release procedure
−- Written certification that each automated vehicular gate and its operator were installed in compliance with UL 325 and ASTM F2200, and that all required entrapment-protection devices were tested and function correctly
−- As-built record showing the installed fence line, post locations, gate locations and swings, grounding points, and any deviations from the contract drawings
−- Warranty documentation for fence materials, gates, gate operators, and polymer coatings as required by this specification
−- Spare-parts and access-control interface documentation, including the operator's safety-loop and entrapment-device wiring as left for connection by the access-control installer
−
−# Quality Assurance
−
−## Installer Qualifications
−
−Fence and gate work shall be performed by an installer regularly engaged in commercial and industrial fence installation. Automated vehicular gate operators shall be installed by personnel trained and certified by the operator manufacturer or holding a recognized automated-gate-operator installer certification, because the entrapment-protection provisions of UL 325 and ASTM F2200 depend on correct field configuration, not merely on the selection of a listed operator. An operator that is listed to UL 325 but installed without the required entrapment-protection devices, or with those devices misconfigured, does not comply.
−
−```datasheet
−label: Automated Gate Installer Qualification
−type: radio
−options:
− - "Manufacturer-certified gate operator installer"
− - "Recognized automated-gate-operator installer certification (e.g., IDEA/AGOTI)"
− - "Not applicable — no automated gates on this project"
−default: "Manufacturer-certified gate operator installer"
−```
−
−## Gate Safety Compliance Authority
−
−Every automated vehicular gate operator installed under this specification shall be listed to UL 325 and shall be installed so that the completed gate system complies with UL 325 and ASTM F2200. These two standards work together: UL 325 governs the operator (the machine and its controls), and ASTM F2200 governs the construction and installation of the gate the operator moves. Compliance with one does not establish compliance with the other. The Contractor is responsible for delivering a complete, compliant gate system, not merely a listed operator. The Authority Having Jurisdiction may require inspection and a compliance affidavit before the gate is energized.
−
−## Pre-Installation Conference
−
−Before fence and gate installation begins, the Contractor shall participate in a pre-installation conference attended by the Contractor's superintendent, the gate operator installer, and the Engineer of Record, and the access-control installer where automated gates interface with an access-control system. The conference shall review the fence layout and grade conditions, post footing requirements, gate swings and travel clearances, the entrapment-protection design for each automated gate, the division of work between the gate operator installer and the access-control installer, and the sequence of power and control connections.
−
−## Mock-Up
−
−Where the contract documents require a mock-up, the Contractor shall erect a representative fence panel and a representative gate of each type for review of fabric tension, post plumb, finish, and hardware operation before proceeding with full production.
−
−```datasheet
−label: Mock-Up Required
−type: radio
−options:
− - "Required — one representative panel and one gate of each type"
− - "Not required"
−default: "Not required"
−```
−
−# Environmental and Service Conditions
−
−## Corrosion Environment
−
−The fence and gate system shall be selected for the corrosivity of the installation environment. Standard hot-dip galvanized framework and fabric are appropriate for ordinary inland atmospheric exposure. Coastal, marine, de-icing-salt, and industrial-chemical environments accelerate corrosion of zinc coatings and warrant heavier zinc coating weights, polymer over-coating, or aluminized or aluminum components. The corrosion environment also governs the fastener and hardware coating class.
−
−```datasheet
−label: Corrosion Exposure Classification
−type: select
−options:
− - "Ordinary inland atmospheric — standard galvanized"
− - "Industrial / urban — heavier zinc or polymer over-coat"
− - "Coastal / marine / de-icing salt — polymer-coated or aluminum"
− - "Per project corrosion assessment"
−default: "Ordinary inland atmospheric — standard galvanized"
−```
−
−## Wind Load
−
−Fence framework, post spacing, and footing design shall resist the design wind load for the project location and exposure category per the adopted building code. Wind load on fencing is highly dependent on the solidity of the fence: open chain-link and picket fence present far less area to the wind than fence fitted with privacy slats, windscreen, fabric screening, or solid panels. Where privacy slats, windscreen, or solid infill are specified, the increased wind load shall be accounted for in post spacing and footing size, because a fence designed as open and then fitted with screening is a common cause of post and footing failure.
−
−```datasheet
−label: Wind Load Basis
−type: radio
−drawing_ref: true
−options:
− - "Open fabric / pickets — no privacy slats or windscreen"
− - "With privacy slats or windscreen — increased solidity accounted for"
− - "Solid infill panels — full wind area"
− - "Per structural design on drawings"
−default: "Open fabric / pickets — no privacy slats or windscreen"
−```
−
−# Chain-Link Fence Framework
−
−## Framework Pipe
−
−Chain-link fence framework — line posts, terminal (end, corner, pull, and gate) posts, top and brace rails — shall be hot-dipped zinc-coated welded steel pipe conforming to ASTM F1083, or shall conform to the strength and protective-coating requirements of ASTM F1043 for the specified framework group. ASTM F1083 Schedule 40 pipe (Group IA framework) is the heavy industrial benchmark and shall be used where framework strength and long service life govern. Lighter roll-formed and high-strength reduced-wall sections conforming to ASTM F1043 Group IC or ASTM F1234 may be used for light-commercial fencing where the design loads permit, but shall not be substituted for Schedule 40 framework where the drawings call for industrial framework.
−
−```datasheet
−label: Chain-Link Framework Type
−type: radio
−options:
− - "ASTM F1083 Schedule 40 pipe (Group IA — heavy industrial)"
− - "ASTM F1043 Group IC high-strength pipe (light industrial / commercial)"
− - "ASTM F1234 roll-formed sections (light commercial)"
−default: "ASTM F1083 Schedule 40 pipe (Group IA — heavy industrial)"
−```
−
−## Framework Coating
−
−Steel framework shall be hot-dip galvanized with a zinc coating not less than 1.8 oz/ft² (550 g/m²) on the exterior and 1.8 oz/ft² on the interior surface for Schedule 40 pipe per ASTM F1083, or shall provide the coating class required by ASTM F1043 for the specified framework group. Where a polymer over-coat or color finish is specified, it shall be applied over the metallic coating and shall conform to the applicable coating class. The interior coating of hollow framework matters as much as the exterior, because uncoated pipe interiors are a common origin of corrosion that is invisible until the post fails at the groundline.
−
−```datasheet
−label: Framework Coating Class
−type: select
−options:
− - "Type A — hot-dip galvanized 1.8 oz/ft² exterior and interior (F1083 / F1043 Type A)"
− - "Type B — zinc 0.9 oz/ft² with chromate and clear polymer (F1043 Type B)"
− - "Type C — zinc 0.9 oz/ft² with chromate and polymer color over-coat (F1043 Type C)"
− - "Polymer color finish over Type A galvanized"
−default: "Type A — hot-dip galvanized 1.8 oz/ft² exterior and interior (F1083 / F1043 Type A)"
−```
−
−## Line Post Spacing
−
−Line posts shall be spaced not more than 10 feet on center along the fence line, measured from center to center, and closer where the design wind load, fence height, or solidity requires. Post spacing exceeding 10 feet leads to fabric sag and reduced wind resistance and shall not be used.
−
−```datasheet
−label: Line Post Maximum Spacing
−type: radio
−unit: ft on center
−options:
− - "8 ft on center (high wind or screened fence)"
− - "10 ft on center (standard)"
−default: "10 ft on center (standard)"
−```
−
−## Post Sizes
−
−Post outside diameters shall be selected for the fence height and the post function. Terminal posts (end, corner, pull, and gate posts) shall be larger than line posts because they resist the tension of the stretched fabric. The following are minimum sizes for common heights; larger sizes shall be used where the structural design, gate weight, or wind load requires.
−
−```datasheet
−label: Line Post Size — Chain-Link up to 8 ft High
−type: select
−unit: in OD
−options:
− - "1.90 in OD (light commercial, up to 6 ft)"
− - "2.375 in OD (standard, up to 8 ft)"
− - "2.875 in OD (heavy / high wind)"
−default: "2.375 in OD (standard, up to 8 ft)"
−```
−
−```datasheet
−label: Terminal Post Size — Chain-Link up to 8 ft High
−type: select
−unit: in OD
−options:
− - "2.375 in OD (light commercial)"
− - "2.875 in OD (standard)"
− - "4.000 in OD (heavy / high security)"
−default: "2.875 in OD (standard)"
−```
−
−# Chain-Link Fabric
−
−## Fabric Material and Coating
−
−Chain-link fabric shall be zinc-coated steel conforming to ASTM A392, or polymer-coated steel conforming to ASTM F668 where a color finish or enhanced corrosion resistance is specified. Zinc-coated fabric shall carry a Class 1 (1.2 oz/ft²) or Class 2 (2.0 oz/ft²) zinc coating; Class 2 shall be used where service life and corrosion exposure warrant the heavier coating. Polymer-coated fabric (ASTM F668) consists of a metallic-coated steel core wire with a fused and bonded or extruded polymer coating and is specified by class and color; it provides both corrosion resistance and a non-reflective, lower-visibility finish.
−
−```datasheet
−label: Chain-Link Fabric Coating
−type: select
−options:
− - "Zinc-coated, ASTM A392 Class 1 (1.2 oz/ft²)"
− - "Zinc-coated, ASTM A392 Class 2 (2.0 oz/ft²)"
− - "Polymer-coated over zinc, ASTM F668 Class 2a"
− - "Polymer-coated over aluminized, ASTM F668 Class 2b"
−default: "Zinc-coated, ASTM A392 Class 2 (2.0 oz/ft²)"
−```
−
−```datasheet
−label: Polymer Coating Color (where polymer-coated)
−type: select
−drawing_ref: true
−options:
− - "Black"
− - "Green"
− - "Brown"
− - "Not applicable — galvanized fabric"
−default: "Black"
−```
−
−## Fabric Wire Gauge
−
−Fabric wire gauge governs the strength and security rating of the fence. Heavier (lower-number) gauges resist cutting and deformation. The wire gauge shall be matched to the fence function: light commercial perimeter fence uses 11 or 9 gauge; security fence uses 9 or 6 gauge.
−
−```datasheet
−label: Fabric Wire Gauge
−type: select
−options:
− - "11 gauge (0.120 in) — light commercial"
− - "9 gauge (0.148 in) — standard commercial / industrial"
− - "6 gauge (0.192 in) — high security"
−default: "9 gauge (0.148 in) — standard commercial / industrial"
−```
−
−## Fabric Mesh Opening
−
−Mesh opening (the dimension between parallel wires) governs both visibility and the security rating. A smaller mesh opening resists climbing and the insertion of cutting tools but increases material cost and wind solidity. Standard commercial fence uses 2-inch mesh; high-security and anti-climb fence uses smaller openings.
−
−```datasheet
−label: Fabric Mesh Opening
−type: select
−unit: in
−options:
− - "2 in (standard commercial / industrial)"
− - "1 in (security — resists toe-hold and tool insertion)"
− - "3/8 in (high-security mini-mesh — anti-climb / anti-cut)"
−default: "2 in (standard commercial / industrial)"
−```
−
−## Fabric Selvage
−
−The top and bottom selvage of the fabric (the finish of the cut wire ends) shall be knuckled or twisted as specified. A knuckled selvage presents a smooth, closed loop and is used at the bottom of fence and at the top of fence in public and pedestrian areas. A twisted (barbed) selvage presents protruding twisted ends and is used at the top of security fence to deter climbing.
−
−```datasheet
−label: Fabric Selvage — Top
−type: radio
−options:
− - "Knuckled (smooth — public / pedestrian areas)"
− - "Twisted / barbed (security — climb deterrent)"
−default: "Knuckled (smooth — public / pedestrian areas)"
−```
−
−```datasheet
−label: Fabric Selvage — Bottom
−type: radio
−options:
− - "Knuckled (smooth — standard)"
− - "Twisted / barbed (buried or anti-dig applications)"
−default: "Knuckled (smooth — standard)"
−```
−
−## Fabric Height
−
−```datasheet
−label: Chain-Link Fabric Height
−type: select
−unit: ft
−drawing_ref: true
−options:
− - "4 ft (low perimeter / screening)"
− - "6 ft (standard commercial perimeter)"
− - "7 ft (industrial / utility)"
− - "8 ft (security perimeter)"
− - "Per fence elevation on drawings"
−default: "6 ft (standard commercial perimeter)"
−```
−
−Fabric height is the nominal height of the fabric measured from the bottom selvage to the top selvage and does not include barbed-wire or razor-ribbon toppings. The overall fence height including topping shall be [[drawing: as indicated on the fence elevations]]. The fabric shall be installed with the bottom selvage not more than 2 inches above finished grade unless a bottom rail or anti-dig measure is specified, because a larger ground gap defeats the purpose of a security fence.
−
−# Chain-Link Rails, Tension Wire, and Fittings
−
−## Top Rail and Bottom Rail
−
−A top rail conforming to ASTM F1083 or F1043 shall be provided continuously along the top of chain-link fence, threaded through line post caps and coupled with expansion sleeves, unless a top tension wire is specified in lieu of a top rail for security fence (a tension wire allows the fabric to flex and deters the use of the top rail as a climbing aid). A bottom rail shall be provided where the drawings require resistance to fabric push-up and animal intrusion at the bottom of the fence.
−
−```datasheet
−label: Top Member
−type: radio
−options:
− - "Top rail (standard commercial)"
− - "Top tension wire (security — no climbing rail)"
− - "Top rail with barbed-wire outrigger above"
−default: "Top rail (standard commercial)"
−```
−
−```datasheet
−label: Bottom Member
−type: radio
−options:
− - "Bottom tension wire"
− - "Bottom rail (resists push-up / anti-dig)"
− - "None"
−default: "Bottom tension wire"
−```
−
−## Tension Wire
−
−Tension (coil) wire shall be metallic-coated or polymer-coated steel marcelled tension wire, not lighter than 7 gauge, installed at the top, bottom, or both as specified, and fastened to the fabric to control sag and resist push-up and pull-out of the fabric between posts. Tension wire shall match the coating of the fabric for corrosion compatibility.
−
−```datasheet
−label: Tension Wire Gauge
−type: radio
−options:
− - "7 gauge (0.177 in) — standard"
− - "6 gauge (0.192 in) — heavy / security"
−default: "7 gauge (0.177 in) — standard"
−```
−
−## Fittings
−
−All fittings — post and line caps, rail and brace ends, top rail sleeves, tension and brace bands, tension bars, truss-rod assemblies, tie wires, and barbed-wire arms — shall conform to ASTM F626. Pressed-steel fittings shall be galvanized after fabrication with a zinc coating not less than 1.20 oz/ft² (366 g/m²), and shall match the framework and fabric finish where a color finish is specified. Tension bars shall be one piece, not less than the full height of the fabric, and shall secure the fabric to terminal posts through tension bands spaced not more than 15 inches on center.
−
−```datasheet
−label: Fitting Finish
−type: radio
−options:
− - "Hot-dip galvanized per ASTM F626"
− - "Galvanized with polymer color over-coat to match fabric"
−default: "Hot-dip galvanized per ASTM F626"
−```
−
−## Bracing and Trussing
−
−Terminal, corner, and gate posts shall be braced to the adjacent line post with a horizontal brace rail and a diagonal truss rod with a turnbuckle or take-up, so that the tension of the stretched fabric does not pull the terminal post out of plumb. Brace and truss assemblies shall be provided at every terminal, corner, pull, and gate post and at intervals along long straight runs as required to maintain fabric tension.
−
−## Fabric Ties
−
−Fabric shall be fastened to line posts and to top rail or top tension wire with tie wires or clips at intervals not exceeding 12 inches on posts and 24 inches on rails, and shall be fastened to bottom tension wire with hog rings at intervals not exceeding 24 inches. For security fence, tamper-resistant fasteners shall be used so that the fabric cannot be readily detached from the framework.
−
−```datasheet
−label: Fabric Tie Type
−type: radio
−options:
− - "Aluminum or galvanized tie wires (standard)"
− - "Tamper-resistant clips / fasteners (security)"
−default: "Aluminum or galvanized tie wires (standard)"
−```
−
−# Ornamental Picket Fence
−
−## Steel Ornamental Picket Fence
−
−Ornamental tubular steel picket fence shall conform to ASTM F2408 for standard grades, or ASTM F2589 where heavy or high-security grades are specified. Pickets, rails, and posts shall be galvanized steel, hot-dip galvanized either before or after forming, with the specified factory-applied polymer or powder-coat finish over the metallic coating. Ornamental picket fence is specified by grade (which sets picket size, rail size, and wall thickness), by the rail configuration (number of rails), and by the picket top treatment.
−
−```datasheet
−label: Steel Ornamental Fence Grade
−type: select
−options:
− - "Residential grade (ASTM F2408 — light)"
− - "Commercial grade (ASTM F2408 — medium)"
− - "Industrial grade (ASTM F2408 — heavy)"
− - "High-security grade (ASTM F2589)"
−default: "Commercial grade (ASTM F2408 — medium)"
−```
−
−```datasheet
−label: Ornamental Fence Rail Configuration
−type: radio
−options:
− - "2-rail"
− - "3-rail (standard commercial security)"
− - "4-rail (high security / anti-climb)"
−default: "3-rail (standard commercial security)"
−```
−
−```datasheet
−label: Picket Top Treatment
−type: select
−options:
− - "Flush / smooth top (pedestrian areas)"
− - "Extended picket (spear / point — climb deterrent)"
− - "Tri-finial / decorative"
− - "Per drawings"
−default: "Extended picket (spear / point — climb deterrent)"
−```
−
−## Aluminum Ornamental Picket Fence
−
−Where corrosion exposure or maintenance considerations warrant, ornamental picket fence shall be extruded aluminum alloy with a factory-applied powder-coat finish. Aluminum ornamental fence does not corrode like steel and is appropriate for coastal and high-moisture environments, but provides lower impact and security resistance than steel of equivalent size and shall not be substituted for steel where security is the governing function.
−
−```datasheet
−label: Ornamental Fence Material
−type: radio
−options:
− - "Galvanized steel (security and strength governing)"
− - "Extruded aluminum (corrosion resistance / low maintenance governing)"
−default: "Galvanized steel (security and strength governing)"
−```
−
−## Ornamental Fence Finish
−
−The factory finish shall be a thermoset powder coat or a fused polymer coating applied over a cleaned and pretreated (and, for steel, galvanized) substrate. The color shall be [[drawing: as indicated on the architectural drawings or finish schedule]]. Field-cut ends and field-drilled holes in steel components shall be touched up with a zinc-rich repair coating per ASTM A780 before the finish coat is repaired, so that the cut does not become a corrosion origin.
−
−```datasheet
−label: Ornamental Fence Finish Color
−type: select
−drawing_ref: true
−options:
− - "Black"
− - "Bronze / dark brown"
− - "White"
− - "Per architectural finish schedule"
−default: "Black"
−```
−
−# Welded-Wire Mesh Security Fence
−
−Welded-wire mesh security fence uses a rigid panel of welded steel wires conforming to ASTM F2453, mounted on posts. The close mesh spacing of anti-climb welded mesh (commonly a narrow vertical aperture that defeats finger and toe holds) makes it a high-security alternative to chain-link where a rigid, difficult-to-climb, difficult-to-cut barrier is required. Mesh panels shall be hot-dip galvanized and may be polymer-coated for color and added corrosion resistance.
−
−```datasheet
−label: Welded Mesh Aperture
−type: select
−options:
− - "Standard square/rectangular mesh"
− - "Anti-climb narrow aperture (e.g., 3/8 in x 3 in — '358' type)"
− - "High-security twin-wire mesh"
−default: "Anti-climb narrow aperture (e.g., 3/8 in x 3 in — '358' type)"
−```
−
−```datasheet
−label: Welded Mesh Coating
−type: radio
−options:
− - "Hot-dip galvanized only"
− - "Galvanized plus polymer color coat"
−default: "Galvanized plus polymer color coat"
−```
−
−# Fence Toppings — Barbed Wire and Razor Ribbon
−
−## Barbed-Wire Outrigger
−
−Where a barbed-wire topping is specified, it shall be supported on barbed-wire arms (outriggers) conforming to ASTM F626, capable of supporting a vertical 250 lb load, mounted on the line and terminal posts. The arms shall be angled outward (toward the unsecured side), vertical, or in a V configuration as specified, and shall carry the specified number of strands of barbed wire. Barbed wire shall conform to ASTM A121 (metallic-coated) or ASTM F1665 (polymer-coated), of the design specified.
−
−```datasheet
−label: Barbed-Wire Topping
−type: radio
−options:
− - "Not provided"
− - "3-strand single-arm outrigger (angled outward)"
− - "6-strand V-arm outrigger (both sides)"
− - "Per security elevation on drawings"
−default: "Not provided"
−```
−
−```datasheet
−label: Barbed Wire Type
−type: radio
−options:
− - "ASTM A121 — galvanized, 12-1/2 ga, 4-point barbs at 5 in O.C."
− - "ASTM F1665 — polymer-coated to match fabric"
− - "Not applicable — no barbed wire"
−default: "Not applicable — no barbed wire"
−```
−
−## Razor Ribbon / Barbed Tape
−
−Where a higher-security topping is specified, razor ribbon (barbed tape) shall be provided in lieu of or in addition to barbed wire. Razor ribbon shall be galvanized or stainless-clad steel-cored barbed tape, supplied as concertina coils or flat-wrap, mounted on the outriggers or along the top of the fence. Because razor ribbon is a serious injury hazard, it shall not be installed on fence adjacent to public pedestrian areas, and its use shall be coordinated with the Owner's security and risk requirements and any local ordinance limiting its use.
−
−```datasheet
−label: High-Security Topping
−type: radio
−options:
− - "Not provided"
− - "Concertina razor coil"
− - "Flat-wrap razor ribbon"
− - "Per security design on drawings"
−default: "Not provided"
−```
−
−# Posts and Concrete Footings
−
−## Footing General
−
−Posts shall be set in cast-in-place concrete footings (drilled or formed piers) with a 28-day compressive strength of not less than 2,500 psi unless the structural design or [[sync/cast-in-place-concrete]] requires a higher strength. Footings shall be crowned or sloped at the top to shed water away from the post, because water ponding at the post groundline is the most common cause of post corrosion failure. Concrete shall not be placed in footing holes containing standing water or loose material; the hole shall be cleaned to undisturbed bearing material before placement.
−
−```datasheet
−label: Footing Concrete Strength
−type: radio
−unit: psi
−options:
− - "2,500 psi (standard fence posts)"
− - "3,000 psi (gate posts / heavy framework)"
− - "Per structural design / cast-in-place concrete standard"
−default: "2,500 psi (standard fence posts)"
−```
−
−## Footing Size and Embedment — Line Posts
−
−Footing diameter and embedment depth shall be sized for the post function, fence height, wind load, and soil bearing. As a minimum for standard fence in ordinary soils, line post footings shall be not less than three times the post diameter in width and shall embed the post not less than the depths below, increased for taller fence, screened fence, poor soils, or the local frost depth. Posts in frost-susceptible soils shall be embedded below the local frost line to prevent frost heave from lifting the post.
−
−```datasheet
−label: Line Post Embedment Depth
−type: range
−unit: in
−drawing_ref: true
−options:
− min: 24
− max: 48
− setpoints: [24, 30, 36, 42]
−default: 30
−```
−
−```datasheet
−label: Line Post Footing Diameter
−type: select
−unit: in
−options:
− - "8 in"
− - "10 in"
− - "12 in"
− - "Per structural design"
−default: "10 in"
−```
−
−## Footing Size and Embedment — Terminal and Gate Posts
−
−Terminal, corner, pull, and gate posts carry concentrated loads — fabric tension at terminals and the cantilevered weight and operating loads of gate leaves at gate posts — and shall have larger and deeper footings than line posts. Gate post footings in particular shall be sized for the gate weight, the leaf length, and the dynamic loads of opening and closing, including the loads imposed by an automated operator. Undersized gate post footings that allow the gate post to lean are among the most common gate failures and the most expensive to correct after the fact.
−
−```datasheet
−label: Gate Post Embedment Depth
−type: range
−unit: in
−drawing_ref: true
−options:
− min: 30
− max: 60
− setpoints: [36, 42, 48, 54]
−default: 36
−```
−
−```datasheet
−label: Gate Post Footing Diameter
−type: select
−unit: in
−options:
− - "12 in"
− - "16 in"
− - "18 in"
− - "Per structural design — sized for gate weight and operating loads"
−default: "Per structural design — sized for gate weight and operating loads"
−```
−
−## Frost Depth
−
−```datasheet
−label: Footing Depth Governed by Frost Line
−type: radio
−drawing_ref: true
−options:
− - "Yes — embed all footings below local frost line"
− - "No — non-frost region; embedment governed by structural requirements"
−default: "Yes — embed all footings below local frost line"
−```
−
−# Swing Gates
−
−## Swing Gate Construction
−
−Single and double swing gates shall conform to ASTM F900. Gate frames shall be fabricated from the framework pipe specified for the fence, welded or assembled with malleable or pressed-steel corner fittings, with the corners trussed by diagonal rods so that the gate leaf does not sag. The gate infill shall match the fence (chain-link fabric, ornamental pickets, or welded mesh) unless otherwise specified. Gate leaf width and the resulting weight govern the hinge, post, and footing design; long single-leaf swing gates sag and are difficult to operate and should be split into double-leaf gates or replaced with a slide gate.
−
−```datasheet
−label: Swing Gate Configuration
−type: radio
−drawing_ref: true
−options:
− - "Single-leaf swing"
− - "Double-leaf swing (drive openings)"
− - "Per gate schedule on drawings"
−default: "Single-leaf swing"
−```
−
−```datasheet
−label: Swing Gate Leaf Infill
−type: radio
−options:
− - "Match fence (chain-link fabric)"
− - "Match fence (ornamental pickets)"
− - "Match fence (welded mesh)"
− - "Per gate elevation"
−default: "Match fence (chain-link fabric)"
−```
−
−## Swing Gate Opening Width
−
−```datasheet
−label: Swing Gate Opening Width
−type: range
−unit: ft
−drawing_ref: true
−options:
− min: 3
− max: 24
− setpoints: [4, 6, 12, 16, 20]
−default: 12
−```
−
−Gate opening width is the clear opening between gate posts and is established by the drawings to suit the vehicle or pedestrian traffic served. The single-leaf maximum practical width before sag and operating difficulty become problems is roughly 6 feet for pedestrian and light gates; wider vehicle openings shall be double-leaf swing gates or slide gates.
−
−## Swing Gate Hinges and Hardware
−
−Hinges shall conform to ASTM F900 and shall be structurally capable of supporting the gate leaf and allowing it to swing freely without binding through repeated open-close cycles. Hinges shall be of a non-lift-off design, or shall be installed so that the gate cannot be lifted off its hinges, for security gates. The gate shall be provided with the latching and stop hardware specified, including a center stop or drop rod for double-leaf gates, gate stops, and keepers to hold the gate in the open position.
−
−```datasheet
−label: Swing Gate Hinge Type
−type: radio
−options:
− - "Standard galvanized gate hinges (ASTM F900)"
− - "Non-lift-off security hinges"
− - "Heavy-duty ball-bearing hinges (automated or heavy gates)"
−default: "Standard galvanized gate hinges (ASTM F900)"
−```
−
−# Slide Gates
−
−## Slide Gate Type
−
−Horizontal slide gates shall conform to ASTM F1184. Cantilever slide gates (Type II) span the opening with no support within the opening, supported and guided by roller assemblies on a counterbalance section that extends beyond the opening; they are the standard choice for vehicular openings because they leave the opening clear and have no track in the driving surface to collect debris or ice. Overhead-slide gates (Type I) are supported from an overhead beam and are used where the counterbalance run for a cantilever gate is not available. Track-type (V-groove) slide gates running on a ground track are not recommended for automated vehicular use because the ground track is an entrapment and maintenance liability.
−
−```datasheet
−label: Slide Gate Type
−type: radio
−options:
− - "Cantilever slide (ASTM F1184 Type II — standard vehicular)"
− - "Overhead slide (ASTM F1184 Type I — limited run-back room)"
−default: "Cantilever slide (ASTM F1184 Type II — standard vehicular)"
−```
−
−## Slide Gate Opening Width and Run-Back
−
−```datasheet
−label: Slide Gate Opening Width
−type: range
−unit: ft
−drawing_ref: true
−options:
− min: 8
− max: 40
− setpoints: [12, 16, 20, 24, 30]
−default: 20
−```
−
−A cantilever slide gate requires a run-back (the clear space alongside the opening into which the gate retracts) of approximately 1.5 times the opening width to accommodate the gate leaf plus the counterbalance section. The Contractor shall verify that the available run-back shown on the drawings is adequate for the specified opening before fabrication; inadequate run-back is a common cantilever-gate coordination error discovered only at installation.
−
−## Slide Gate Ground Clearance and Rollers
−
−For cantilever gates with external rollers, the ground clearance beneath the gate leaf shall be approximately 3 inches, grade permitting, so that the gate clears uneven pavement and accumulated debris and ice without binding. All exposed rollers and roller assemblies on automated slide gates shall be covered or guarded in accordance with ASTM F2200 so that they do not create a pinch or entrapment hazard.
−
−```datasheet
−label: Slide Gate Ground Clearance
−type: radio
−unit: in
−options:
− - "3 in (standard — grade permitting)"
− - "Per site grading — coordinate with paving"
−default: "3 in (standard — grade permitting)"
−```
−
−# Pedestrian Gates
−
−Pedestrian gates shall be swing gates conforming to ASTM F900, sized for the required passage width and for accessibility where they serve an accessible route. Pedestrian gates on an accessible route shall provide the clear opening width and the maneuvering clearances required by the adopted accessibility standard, and shall be operable with hardware that does not require tight grasping, pinching, or twisting of the wrist. Pedestrian gates shall be separated from automated vehicular gates; pedestrians shall never be routed through a moving vehicular gate, which is a fundamental ASTM F2200 safety principle.
−
−```datasheet
−label: Pedestrian Gate Accessibility
−type: radio
−options:
− - "Accessible route — meets clear width and accessible hardware requirements"
− - "Not on an accessible route"
−default: "Accessible route — meets clear width and accessible hardware requirements"
−```
−
−```datasheet
−label: Pedestrian Gate Clear Opening Width
−type: radio
−unit: in
−drawing_ref: true
−options:
− - "36 in (single accessible passage)"
− - "48 in (wide passage)"
− - "Per drawings"
−default: "36 in (single accessible passage)"
−```
−
−# Automated Vehicular Gate Operators
−
−## Operator Listing and Usage Class
−
−Every automated vehicular gate operator shall be listed to UL 325 and shall be selected for the correct usage class for the installation. UL 325 defines four usage classes by the type of property served, and the required entrapment-protection and access provisions differ by class. Selecting the wrong usage class — for example, a Class I residential operator on a Class III commercial gate — produces a non-compliant installation regardless of the operator's listing.
−
−```datasheet
−label: Gate Operator Usage Class (UL 325)
−type: select
−options:
− - "Class I — residential (single-family)"
− - "Class II — commercial / general access (multi-family, school, retail)"
− - "Class III — industrial / limited access (factory, loading dock)"
− - "Class IV — restricted access (guarded industrial, airport, high-security)"
−default: "Class III — industrial / limited access (factory, loading dock)"
−```
−
−## Operator Type and Power
−
−The operator type shall match the gate type — slide-gate operator for cantilever and overhead-slide gates, swing-gate operator for swing gates. The operator shall be sized for the gate leaf weight and length and the duty cycle. Power supply, conduit, and disconnect shall be coordinated with the electrical scope; where standby operation is required during a power outage, a battery backup or a manual-release means shall be provided.
−
−```datasheet
−label: Gate Operator Type
−type: radio
−options:
− - "Slide-gate operator (cantilever / overhead slide)"
− - "Swing-gate operator (single or dual arm)"
− - "Per gate type on drawings"
−default: "Slide-gate operator (cantilever / overhead slide)"
−```
−
−```datasheet
−label: Operator Power Supply
−type: select
−drawing_ref: true
−options:
− - "120 VAC single phase"
− - "208-240 VAC single phase"
− - "Solar with battery (remote sites)"
− - "Per electrical drawings"
−default: "120 VAC single phase"
−```
−
−```datasheet
−label: Standby / Backup Operation
−type: radio
−options:
− - "Battery backup for continued operation on power loss"
− - "Manual release only on power loss"
− - "Per Owner requirement"
−default: "Battery backup for continued operation on power loss"
−```
−
−# Gate Safety and Entrapment Protection
−
−## Inherent Entrapment Sensing
−
−Every automated vehicular gate operator shall include an inherent (Type A) entrapment-sensing means that stops and reverses the gate when it contacts an obstruction. The inherent sensor is the operator's built-in obstruction detection and is the first of the required means of entrapment protection. It alone is not sufficient: UL 325 requires at least two independent means of entrapment protection for each direction of gate travel.
−
−## Independent Entrapment-Protection Devices
−
−In addition to the inherent sensor, each direction of gate travel shall be protected by at least one independent external entrapment-protection device — either a Type B1 non-contact device (photoelectric sensor or photo eye) or a Type B2 contact device (a sensing edge that reverses the gate on contact). The devices shall be located to protect every entrapment zone the gate creates: the leading edge of the gate in the closing direction, the trailing edge and the run-back zone of a slide gate in the opening direction, and the pinch points between the moving gate and fixed framework, posts, and walls.
−
−```datasheet
−label: Entrapment Protection — Closing Direction
−type: select
−options:
− - "Photoelectric sensor (Type B1) — non-contact"
− - "Sensing edge (Type B2) — contact"
− - "Both photo eye and sensing edge"
−default: "Both photo eye and sensing edge"
−```
−
−```datasheet
−label: Entrapment Protection — Opening Direction
−type: select
−options:
− - "Photoelectric sensor (Type B1) — non-contact"
− - "Sensing edge (Type B2) — contact"
− - "Both photo eye and sensing edge"
−default: "Both photo eye and sensing edge"
−```
−
−The two means in each direction shall be independent so that the failure of one does not disable both. A single device cannot satisfy the two-means requirement, and an inherent sensor plus a single photo eye is the practical minimum; sensing edges on the leading and trailing edges of the gate provide contact protection where a non-contact sensor cannot see a low or thin obstruction.
−
−## Gate Construction for Automation (ASTM F2200)
−
−Every gate that is, or is designed to be, automated shall be constructed in accordance with ASTM F2200. The gate construction requirements exist because automating a gate turns a passive barrier into a powered machine, and the gate must be built so that it does not catch, crush, or fall on a person. The following construction requirements apply and shall be reflected in the gate fabrication and installation.
−
−```datasheet
−label: ASTM F2200 Gate Construction Requirements (verify all that apply)
−type: checkbox
−options:
− - "No openings in the gate that would allow a 2-1/4 in sphere to pass in the area a person could reach through (reduces reach-through entrapment)"
− - "Exposed rollers covered or guarded"
− - "Gate restrained so it cannot fall over if disconnected or derailed"
− - "No protrusions or sharp edges on the gate or in the travel path"
− - "Pinch and entrapment zones between gate and fixed structure guarded or screened"
− - "Gate guided so it cannot leave its supports during normal operation"
−default: "Exposed rollers covered or guarded"
−```
−
−## Warning Signage and Controls Location
−
−Warning placards advising that the gate is automated and may move without warning shall be posted on both sides of the gate. Manually operated controls (push buttons, key switches) that can override entrapment protection shall be located so that the operator of the control has a clear, unobstructed view of the entire gate and its travel path and is at least the required distance from the moving gate, so that the gate cannot be operated by a person who cannot see it.
−
−```datasheet
−label: Manual Control Location
−type: radio
−options:
− - "Within clear sight of the gate, minimum required distance from gate travel"
− - "Remote with no line of sight — PROHIBITED for override controls"
−default: "Within clear sight of the gate, minimum required distance from gate travel"
−```
−
−# Gate Hardware and Access Control Provisions
−
−## Locking and Latching Hardware
−
−Gate latching, locking, and stop hardware shall be galvanized or finished to match the gate and shall be of sufficient strength for the gate function. Manual gates shall be provided with the latch and padlock provisions specified. Where electric locking is specified — electric strikes, magnetic locks, or solenoid-operated latches — the locking hardware and its rough-in shall be coordinated with the access-control scope.
−
−```datasheet
−label: Gate Locking Provision
−type: select
−options:
− - "Manual latch with padlock provision"
− - "Electric strike (powered by others)"
− - "Magnetic lock (powered by others)"
− - "Integral to gate operator (slide / swing)"
−default: "Manual latch with padlock provision"
−```
−
−## Access Control Interface
−
−The Contractor shall provide the conduit, junction boxes, and pull strings for the access-control wiring at each automated or electrically locked gate, and shall terminate the gate operator's safety, control, and free-exit inputs as required for connection by the access-control installer. The credential readers, intercoms, keypads, free-exit loops, the gate controller, and the head-end logic that decide when the gate opens are furnished and connected under [[sync/access-control-systems]]. The division of responsibility shall be confirmed at the pre-installation conference so that the gate is left ready for connection and no interface is omitted between scopes.
−
−```datasheet
−label: Access Control Wiring Division
−type: radio
−options:
− - "This contract: conduit, boxes, pull strings, and operator terminations only"
− - "This contract: complete operator wiring; access-control head end by others"
− - "Per project responsibility matrix on drawings"
−default: "This contract: conduit, boxes, pull strings, and operator terminations only"
−```
−
−```datasheet
−label: Vehicle Detection / Free-Exit Loops
−type: select
−options:
− - "Inductive loops installed by this contract, connected by access-control"
− - "Loops furnished and connected by access-control installer"
− - "Not required"
−default: "Inductive loops installed by this contract, connected by access-control"
−```
−
−# Grounding and Bonding
−
−Fence and gate framework shall be grounded and bonded where required by the adopted electrical code, particularly where the fence is within the zone of influence of high-voltage equipment, near overhead power lines, or at electrically powered gate operators. Metallic fence near power lines can accumulate dangerous induced voltages, and powered gate equipment shall be grounded for both fault clearing and lightning protection. Grounding electrode conductors, ground rods, and bonding jumpers shall be installed at the intervals and locations shown on the drawings.
−
−```datasheet
−label: Fence Grounding Required
−type: radio
−drawing_ref: true
−options:
− - "Yes — fence within influence of power lines / electrified equipment"
− - "Yes — at powered gate operators only"
− - "No — not required for this installation"
−default: "Yes — at powered gate operators only"
−```
−
−# Installation
−
−## Layout and Grade
−
−The fence line shall be staked and the post locations laid out from the contract drawings before any footing is excavated. The Contractor shall verify that the staked line clears all underground utilities, using utility locates and hand-digging within tolerance zones. Where the fence crosses changing grade, the framework shall follow the grade in stepped or raked sections as the fabric type allows; chain-link fabric can be raked to follow a uniform slope, while rigid ornamental and welded-mesh panels are stepped. The bottom-of-fence clearance to grade shall be maintained within the limits specified for the fence function.
−
−## Post Setting
−
−Posts shall be set plumb in their footings, at the correct line and spacing, and shall not be disturbed until the concrete has attained sufficient strength to resist construction loads. Fabric and gate leaves shall not be hung until the footings have cured. Posts set out of plumb, or footings loaded before cure, are common and visible defects.
−
−## Fabric Installation
−
−Chain-link fabric shall be stretched taut with a fabric stretcher, fastened to terminal posts with a full-height tension bar and tension bands, and tied to line posts, rails, and tension wire at the specified intervals. The fabric shall be uniformly tensioned so that it does not sag or wave between posts. Fabric installation shall conform to ASTM F567.
−
−## Gate Installation and Adjustment
−
−Gates shall be hung plumb and shall swing or slide freely through their full travel without binding, dragging, or contacting the ground. Swing gates shall be adjusted so the leaf does not sag, and the truss rods shall be tensioned to remove sag. Slide gates shall be adjusted so the rollers carry the leaf smoothly and the gate stops at the correct open and closed positions. Automated gates shall be adjusted, and their limit and obstruction settings configured, in accordance with the operator manufacturer's instructions and tested for compliance before the gate is placed in service.
−
−## Field Repair of Coatings
−
−Field cuts, drilled holes, welds, and abrasions that expose bare steel shall be repaired with a zinc-rich repair coating conforming to ASTM A780, and the factory color finish shall be touched up to match. Bare steel left at a field cut is the most common origin of premature corrosion in an otherwise galvanized fence.
−
−```datasheet
−label: Field Coating Repair Material
−type: radio
−options:
− - "Zinc-rich repair coating per ASTM A780"
− - "Cold-galvanizing compound plus color touch-up to match finish"
−default: "Zinc-rich repair coating per ASTM A780"
−```
−
−# Field Testing and Acceptance
−
−## Gate Operation Test
−
−Each gate shall be operated through its full range of travel and demonstrated to swing or slide freely without binding, to latch and lock as specified, and to stop at the correct positions. Automated gates shall be cycled to confirm the operator opens and closes the gate fully, stops and reverses on the inherent sensor, and responds correctly to each independent entrapment-protection device.
−
−## Entrapment-Protection Test
−
−Each entrapment-protection device on every automated gate shall be tested by simulating an obstruction in its protected zone and confirming that the gate stops and reverses (in the closing direction) or stops (in the opening direction) as required. The test shall be performed for each direction of travel and for each device, and the results shall be documented in the closeout certification. A gate shall not be placed in service until every required entrapment-protection device has been tested and confirmed to function.
−
−```datasheet
−label: Entrapment-Protection Acceptance Test
−type: radio
−options:
− - "Required — test every device in every direction, documented before energizing"
− - "Not applicable — no automated gates"
−default: "Required — test every device in every direction, documented before energizing"
−```
−
−## Plumb, Alignment, and Tension Check
−
−The completed fence shall be checked for post plumb, line alignment, uniform fabric or panel tension, correct height, and the specified ground clearance. Sagging fabric, out-of-plumb posts, leaning gate posts, and gates that drag or bind shall be corrected before acceptance.
−
−# Delivery, Storage, and Handling
−
−Fence materials shall be delivered and stored so that coatings are not damaged. Galvanized and polymer-coated framework and fabric shall be stored off the ground on supports, kept dry and ventilated, and not stored in tight bundles where trapped moisture causes wet-storage staining (white rust) on galvanized surfaces. Polymer-coated and powder-coated components shall be protected from abrasion and impact that chip the finish. Gate operators and their electronics shall be stored indoors, protected from weather, until installed. Damaged materials, and galvanized materials with significant wet-storage staining, shall not be installed.
−
−```datasheet
−label: Material Storage
−type: radio
−options:
− - "Off ground, dry, ventilated; operators stored indoors"
− - "Per manufacturer's storage instructions"
−default: "Off ground, dry, ventilated; operators stored indoors"
−```
−
−# Warranty
−
−The Contractor shall warrant the fence and gate installation, including framework, fabric, gates, hardware, and the achievement of plumb, tension, and free operation, for the project warranty period beginning at substantial completion. Warranty obligations include correction of post heave and lean, fabric sag, gate sag and binding, coating failure not attributable to abuse, and gate operator malfunction.
−
−```datasheet
−label: Fence and Gate Installation Warranty
−type: select
−options:
− - "1 year from substantial completion"
− - "2 years from substantial completion"
−default: "1 year from substantial completion"
−```
−
−Polymer and powder-coat finishes and the gate operators frequently carry longer manufacturer warranties; those manufacturer warranties shall be assigned to the Owner and shall run from substantial completion. The Contractor shall provide the manufacturer warranty documentation for finishes and operators at closeout.
−
−```datasheet
−label: Gate Operator Manufacturer Warranty
−type: select
−options:
− - "1 year"
− - "2 years"
− - "5 years (heavy-duty operators)"
− - "Per manufacturer standard warranty"
−default: "Per manufacturer standard warranty"
−```
−
−# Spare Parts
−
−The Contractor shall provide the spare parts and special tools required to maintain the gate operators and access provisions, as specified. At a minimum, where automated gates are provided, the Contractor shall furnish the manual-release keys or tools and any proprietary programming or limit-setting tool required for routine adjustment, and shall turn over the operator manufacturer's recommended spare-parts list.
−
−```datasheet
−label: Spare Parts and Tools
−type: checkbox
−options:
− - "Manual-release keys / tools for each automated gate"
− - "Operator programming / limit-setting tool"
− - "Manufacturer-recommended spare entrapment-protection devices"
− - "Spare fabric ties and fittings"
−default: "Manual-release keys / tools for each automated gate"
−```
+---
+title: Fencing and Gates
+category: Sitework
+toc_depth: 3
+description: >
+ When to use: Site perimeter, security, and screening fencing and gates for commercial, institutional, and industrial projects, including galvanized and polymer-coated chain-link fence systems, ornamental tubular steel and aluminum picket fence, welded-wire mesh security fence, posts and concrete footings, top and bottom rails and tension wire, barbed-wire and razor-ribbon outriggers, single and double swing gates, cantilever and overhead-slide vehicular gates, pedestrian gates, automated vehicular gate operators listed to UL 325, the gate construction and entrapment-protection requirements of ASTM F2200, and gate hardware including hinges, latches, and provisions for access control and electric locking hardware furnished by others. Intended to be read alongside the civil site plan and fence layout drawings, which govern fence lines, heights, gate locations and swings, and grade conditions.
+ Not intended for: Wood, vinyl, composite, and chain-link residential fencing for single-family use; agricultural and field fencing (woven-wire, high-tensile, electric livestock fence); guardrail, crash-rated anti-ram vehicle barriers, bollards, and crash-rated gates certified to ASTM F2656 (those require a project-specific perimeter-security specification); retaining walls and freestanding masonry or concrete screen walls (see [[sync/cast-in-place-concrete]]); handrails and guards on stairs and ramps; sound barrier walls; sports-netting and backstop systems beyond standard chain-link; expansion-joint and structural detailing of the foundations themselves (see [[sync/cast-in-place-concrete]]); and the access-control head end, credential readers, intercoms, and gate-controller logic (see [[sync/access-control-systems]]). Earthwork, grading, and subgrade beneath fence lines and gate slabs are covered by [[sync/earthwork]].
+---
+
+# Scope {toc}
+
+## This specification covers the materials, fabrication, and installation of site perimeter, security, and screening fencing and the associated swing, slide, and pedestrian gates, including automated vehicular gate operators and their entrapment-protection systems. {note}
+
+## Fencing is frequently treated as an afterthought scope, installed late and detailed thinly, yet it is the most visible boundary of a completed project and, where it serves a security function, it is a life-safety and liability element. {note}
+
+## A fence that is the wrong height, set on inadequate footings, or fitted with an automated gate that does not comply with current entrapment-protection standards is a defect that is both conspicuous and, in the case of gate operators, potentially dangerous. {note}
+
+## This standard addresses chain-link fence systems including framework pipe, fabric, rails, tension wire, and fittings; ornamental tubular steel and aluminum picket fence; welded-wire mesh security fence; barbed-wire, barbed-tape, and razor-ribbon toppings; post types, spacing, and concrete footings; single and double swing gates; cantilever and overhead-slide vehicular gates; pedestrian gates; automated vehicular gate operators; the gate construction and safety requirements that govern automated gates; and gate hardware. {note}
+
+## The selection of fence type, height, line, and gate locations is established by the contract drawings and is project-specific; this standard governs how the selected systems are built and installed. {note}
+
+## All work under this specification shall conform to the fence lines, heights, gate locations, gate swings, and grade conditions shown on the contract drawings.
+
+## Where this standard and the drawings or the geotechnical report conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## The Contractor shall coordinate fence and gate work with [[sync/earthwork]] for grading and subgrade along fence lines and at gate slabs, with [[sync/cast-in-place-concrete]] for post footings and gate operator pads where cast-in-place concrete is specified, and with [[sync/access-control-systems]] for the conduit, power, control wiring, credential readers, and gate-controller logic that interface with automated gate operators and electric gate locks.
+
+# Referenced Standards {toc}
+
+## Materials, fabrication, testing, and installation shall comply with the latest adopted edition of the following standards.
+
+## Where project documents, adopted codes, and referenced standards conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## Referenced Standards List {toc}
+
+| Standard | Title |
+|----------|-------|
+| ASTM A392 | Standard Specification for Zinc-Coated Steel Chain-Link Fence Fabric |
+| ASTM F668 | Standard Specification for Polyvinyl Chloride (PVC), Polyolefin, and Other Polymer-Coated Steel Chain-Link Fence Fabric |
+| ASTM F1083 | Standard Specification for Pipe, Steel, Hot-Dipped Zinc-Coated (Galvanized) Welded, for Fence Structures |
+| ASTM F1043 | Standard Specification for Strength and Protective Coatings on Steel Industrial Fence Framework |
+| ASTM F1234 | Standard Specification for Protective Coatings on Steel Framework for Fences (round and roll-formed sections) |
+| ASTM F626 | Standard Specification for Fence Fittings |
+| ASTM A121 | Standard Specification for Metallic-Coated Carbon Steel Barbed Wire |
+| ASTM F1665 | Standard Specification for Polyvinyl Chloride (PVC) and Other Conforming Organic Polymer-Coated Steel Barbed Wire |
+| ASTM F900 | Standard Specification for Industrial and Commercial Swing Gates |
+| ASTM F1184 | Standard Specification for Industrial and Commercial Horizontal Slide Gates |
+| ASTM F2408 | Standard Specification for Ornamental Fences Employing Galvanized Steel Tubular Pickets |
+| ASTM F2589 | Standard Specification for Ornamental Fences Employing Galvanized Steel Tubular Pickets, Heavy and High-Security Grades |
+| ASTM F2453 | Standard Specification for Welded Wire Mesh Fence Fabric (Metallic-Coated or Polymer Coated) for Meshes of 6 in² or Less, in Panels or Rolls, with Uniform Meshes |
+| ASTM F2611 | Standard Guide for the Design and Construction of Chain Link Security Fencing |
+| ASTM F2814 | Standard Guide for Design and Construction of Ornamental Steel Picket Fence Systems for Security Purposes |
+| ASTM F567 | Standard Practice for Installation of Chain-Link Fence |
+| ASTM A123/A123M | Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products |
+| ASTM A153/A153M | Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware |
+| ASTM A780/A780M | Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings |
+| UL 325 | Standard for Door, Drapery, Gate, Louver, and Window Operators and Systems |
+| ASTM F2200 | Standard Specification for Automated Vehicular Gate Construction |
+| ASTM F2656/F2656M | Standard Test Method for Crash Testing of Vehicle Security Barriers (referenced for exclusions only) |
+
+## Framework Coating Standards {toc}
+
+### ASTM F1083 governs the steel pipe itself (the most common chain-link and gate framework material). {note}
+
+### ASTM F1043 governs the strength and protective-coating classes of industrial fence framework and references F1083 Group IA as its benchmark. {note}
+
+### ASTM F1234 covers protective coatings on roll-formed and lighter framework sections. {note}
+
+### These standards are complementary, not alternatives, and the correct combination is identified in the framework sections of this standard. {note}
+
+# Submittals {toc}
+
+## Action Submittals {toc}
+
+### The Contractor shall submit the following for the Engineer of Record's review before fabricating or delivering any fence or gate materials:
+
+- Product data for fence fabric, framework, fittings, gates, gate hardware, and gate operators, identifying the governing ASTM standard, coating class, gauge or wall thickness, and finish for each component
+- Shop drawings showing fence elevations, post types and spacing, footing details and embedment depths, gate elevations and swings or travel, brace and truss arrangements, grounding details, and the location of every line, terminal, corner, end, gate, and pull post keyed to the site plan
+- Gate operator data: manufacturer's installation instructions, the UL 325 listing and the operator usage class (Class I through Class IV), the entrapment-protection means provided in each direction of travel, and the wiring and interface schedule for power, control, and access-control connections
+- ASTM F2200 gate construction compliance statement for each automated gate leaf, identifying how each construction requirement (mesh openings, exposed-roller covers, guarding of pinch and entrapment zones, restraint against falling) is satisfied
+- Galvanizing and coating certifications: mill or applicator certification of zinc coating weights for fabric (ASTM A392), framework (ASTM F1043/F1083), fittings (ASTM F626 / A153), and polymer-coating class and color where polymer-coated materials are specified (ASTM F668)
+- Concrete mix design or product data for post footing concrete, coordinated with [[sync/cast-in-place-concrete]]
+
+```datasheet
+label: Action Submittals Required
+type: checkbox
+options:
+ - "Product data (fabric, framework, fittings, gates, hardware, operators)"
+ - "Shop drawings (elevations, post schedule, footings, gate swings/travel, grounding)"
+ - "Gate operator data (UL 325 listing, usage class, entrapment means, wiring)"
+ - "ASTM F2200 gate construction compliance statement"
+ - "Galvanizing / polymer-coating certifications"
+ - "Footing concrete mix design / product data"
+default: "Product data (fabric, framework, fittings, gates, hardware, operators)"
+```
+
+### Fabrication shall not begin until the submittals are reviewed and returned.
+
+### Submittal review does not relieve the Contractor of responsibility for compliance with the contract documents.
+
+## Closeout Submittals {toc}
+
+### Prior to substantial completion the Contractor shall provide the following:
+
+- Operation and maintenance manuals for gate operators, including the maintenance schedule, the procedure for periodic testing of entrapment-protection devices, and the manual-release procedure
+- Written certification that each automated vehicular gate and its operator were installed in compliance with UL 325 and ASTM F2200, and that all required entrapment-protection devices were tested and function correctly
+- As-built record showing the installed fence line, post locations, gate locations and swings, grounding points, and any deviations from the contract drawings
+- Warranty documentation for fence materials, gates, gate operators, and polymer coatings as required by this specification
+- Spare-parts and access-control interface documentation, including the operator's safety-loop and entrapment-device wiring as left for connection by the access-control installer
+
+```datasheet
+label: Closeout Submittals Required
+type: checkbox
+options:
+ - "Operation and maintenance manuals for gate operators"
+ - "Written UL 325 / ASTM F2200 installation and entrapment-test certification"
+ - "As-built record (fence line, posts, gate locations/swings, grounding)"
+ - "Warranty documentation (materials, gates, operators, coatings)"
+ - "Spare-parts and access-control interface documentation"
+default: "Operation and maintenance manuals for gate operators"
+```
+
+# Quality Assurance {toc}
+
+## Installer Qualifications {toc}
+
+```datasheet
+label: Automated Gate Installer Qualification
+type: radio
+options:
+ - "Manufacturer-certified gate operator installer"
+ - "Recognized automated-gate-operator installer certification (e.g., IDEA/AGOTI)"
+ - "Not applicable — no automated gates on this project"
+default: "Manufacturer-certified gate operator installer"
+```
+
+### Fence and gate work shall be performed by an installer regularly engaged in commercial and industrial fence installation.
+
+### Automated vehicular gate operators shall be installed by personnel trained and certified by the operator manufacturer or holding a recognized automated-gate-operator installer certification.
+
+### The entrapment-protection provisions of UL 325 and ASTM F2200 depend on correct field configuration, not merely on the selection of a listed operator; an operator that is listed to UL 325 but installed without the required entrapment-protection devices, or with those devices misconfigured, does not comply. {note}
+
+## Gate Safety Compliance Authority {toc}
+
+### Every automated vehicular gate operator installed under this specification shall be listed to UL 325 and shall be installed so that the completed gate system complies with UL 325 and ASTM F2200.
+
+### The Contractor is responsible for delivering a complete, compliant gate system, not merely a listed operator.
+
+### UL 325 governs the operator (the machine and its controls), and ASTM F2200 governs the construction and installation of the gate the operator moves; these two standards work together, and compliance with one does not establish compliance with the other. {note}
+
+### The Authority Having Jurisdiction may require inspection and a compliance affidavit before the gate is energized.
+
+## Pre-Installation Conference {toc}
+
+### Before fence and gate installation begins, the Contractor shall participate in a pre-installation conference attended by the Contractor's superintendent, the gate operator installer, and the Engineer of Record, and the access-control installer where automated gates interface with an access-control system.
+
+### The conference shall review the fence layout and grade conditions, post footing requirements, gate swings and travel clearances, the entrapment-protection design for each automated gate, the division of work between the gate operator installer and the access-control installer, and the sequence of power and control connections.
+
+## Mock-Up {toc}
+
+```datasheet
+label: Mock-Up Required
+type: radio
+options:
+ - "Required — one representative panel and one gate of each type"
+ - "Not required"
+default: "Not required"
+```
+
+### Where the contract documents require a mock-up, the Contractor shall erect a representative fence panel and a representative gate of each type for review of fabric tension, post plumb, finish, and hardware operation before proceeding with full production.
+
+# Environmental and Service Conditions {toc}
+
+## Corrosion Environment {toc}
+
+```datasheet
+label: Corrosion Exposure Classification
+type: select
+options:
+ - "Ordinary inland atmospheric — standard galvanized"
+ - "Industrial / urban — heavier zinc or polymer over-coat"
+ - "Coastal / marine / de-icing salt — polymer-coated or aluminum"
+ - "Per project corrosion assessment"
+default: "Ordinary inland atmospheric — standard galvanized"
+```
+
+### The fence and gate system shall be selected for the corrosivity of the installation environment.
+
+### Standard hot-dip galvanized framework and fabric are appropriate for ordinary inland atmospheric exposure.
+
+### Coastal, marine, de-icing-salt, and industrial-chemical environments accelerate corrosion of zinc coatings and warrant heavier zinc coating weights, polymer over-coating, or aluminized or aluminum components.
+
+### The corrosion environment also governs the fastener and hardware coating class.
+
+## Wind Load {toc}
+
+```datasheet
+label: Wind Load Basis
+type: radio
+drawing_ref: true
+options:
+ - "Open fabric / pickets — no privacy slats or windscreen"
+ - "With privacy slats or windscreen — increased solidity accounted for"
+ - "Solid infill panels — full wind area"
+ - "Per structural design on drawings"
+default: "Open fabric / pickets — no privacy slats or windscreen"
+```
+
+### Fence framework, post spacing, and footing design shall resist the design wind load for the project location and exposure category per the adopted building code.
+
+### Wind load on fencing is highly dependent on the solidity of the fence: open chain-link and picket fence present far less area to the wind than fence fitted with privacy slats, windscreen, fabric screening, or solid panels. {note}
+
+### Where privacy slats, windscreen, or solid infill are specified, the increased wind load shall be accounted for in post spacing and footing size.
+
+### A fence designed as open and then fitted with screening is a common cause of post and footing failure. {note}
+
+# Chain-Link Fence Framework {toc}
+
+## Framework Pipe {toc}
+
+```datasheet
+label: Chain-Link Framework Type
+type: radio
+options:
+ - "ASTM F1083 Schedule 40 pipe (Group IA — heavy industrial)"
+ - "ASTM F1043 Group IC high-strength pipe (light industrial / commercial)"
+ - "ASTM F1234 roll-formed sections (light commercial)"
+default: "ASTM F1083 Schedule 40 pipe (Group IA — heavy industrial)"
+```
+
+### Chain-link fence framework — line posts, terminal (end, corner, pull, and gate) posts, top and brace rails — shall be hot-dipped zinc-coated welded steel pipe conforming to ASTM F1083, or shall conform to the strength and protective-coating requirements of ASTM F1043 for the specified framework group.
+
+### ASTM F1083 Schedule 40 pipe (Group IA framework) is the heavy industrial benchmark and shall be used where framework strength and long service life govern.
+
+### Lighter roll-formed and high-strength reduced-wall sections conforming to ASTM F1043 Group IC or ASTM F1234 may be used for light-commercial fencing where the design loads permit, but shall not be substituted for Schedule 40 framework where the drawings call for industrial framework.
+
+## Framework Coating {toc}
+
+```datasheet
+label: Framework Coating Class
+type: select
+options:
+ - "Type A — hot-dip galvanized 1.8 oz/ft² exterior and interior (F1083 / F1043 Type A)"
+ - "Type B — zinc 0.9 oz/ft² with chromate and clear polymer (F1043 Type B)"
+ - "Type C — zinc 0.9 oz/ft² with chromate and polymer color over-coat (F1043 Type C)"
+ - "Polymer color finish over Type A galvanized"
+default: "Type A — hot-dip galvanized 1.8 oz/ft² exterior and interior (F1083 / F1043 Type A)"
+```
+
+### Steel framework shall be hot-dip galvanized with a zinc coating not less than 1.8 oz/ft² (550 g/m²) on the exterior and 1.8 oz/ft² on the interior surface for Schedule 40 pipe per ASTM F1083, or shall provide the coating class required by ASTM F1043 for the specified framework group.
+
+### Where a polymer over-coat or color finish is specified, it shall be applied over the metallic coating and shall conform to the applicable coating class.
+
+### The interior coating of hollow framework matters as much as the exterior, because uncoated pipe interiors are a common origin of corrosion that is invisible until the post fails at the groundline. {note}
+
+## Line Post Spacing {toc}
+
+```datasheet
+label: Line Post Maximum Spacing
+type: radio
+unit: ft on center
+options:
+ - "8 ft on center (high wind or screened fence)"
+ - "10 ft on center (standard)"
+default: "10 ft on center (standard)"
+```
+
+### Line posts shall be spaced not more than 10 feet on center along the fence line, measured from center to center, and closer where the design wind load, fence height, or solidity requires.
+
+### Post spacing exceeding 10 feet leads to fabric sag and reduced wind resistance and shall not be used.
+
+## Post Sizes {toc}
+
+```datasheet
+label: Line Post Size — Chain-Link up to 8 ft High
+type: select
+unit: in OD
+options:
+ - "1.90 in OD (light commercial, up to 6 ft)"
+ - "2.375 in OD (standard, up to 8 ft)"
+ - "2.875 in OD (heavy / high wind)"
+default: "2.375 in OD (standard, up to 8 ft)"
+```
+
+```datasheet
+label: Terminal Post Size — Chain-Link up to 8 ft High
+type: select
+unit: in OD
+options:
+ - "2.375 in OD (light commercial)"
+ - "2.875 in OD (standard)"
+ - "4.000 in OD (heavy / high security)"
+default: "2.875 in OD (standard)"
+```
+
+### Post outside diameters shall be selected for the fence height and the post function.
+
+### Terminal posts (end, corner, pull, and gate posts) shall be larger than line posts because they resist the tension of the stretched fabric.
+
+### The sizes scheduled in the datasheets above are minimums for common heights; larger sizes shall be used where the structural design, gate weight, or wind load requires.
+
+# Chain-Link Fabric {toc}
+
+## Fabric Material and Coating {toc}
+
+```datasheet
+label: Chain-Link Fabric Coating
+type: select
+options:
+ - "Zinc-coated, ASTM A392 Class 1 (1.2 oz/ft²)"
+ - "Zinc-coated, ASTM A392 Class 2 (2.0 oz/ft²)"
+ - "Polymer-coated over zinc, ASTM F668 Class 2a"
+ - "Polymer-coated over aluminized, ASTM F668 Class 2b"
+default: "Zinc-coated, ASTM A392 Class 2 (2.0 oz/ft²)"
+```
+
+```datasheet
+label: Polymer Coating Color (where polymer-coated)
+type: select
+drawing_ref: true
+options:
+ - "Black"
+ - "Green"
+ - "Brown"
+ - "Not applicable — galvanized fabric"
+default: "Black"
+```
+
+### Chain-link fabric shall be zinc-coated steel conforming to ASTM A392, or polymer-coated steel conforming to ASTM F668 where a color finish or enhanced corrosion resistance is specified.
+
+### Zinc-coated fabric shall carry a Class 1 (1.2 oz/ft²) or Class 2 (2.0 oz/ft²) zinc coating; Class 2 shall be used where service life and corrosion exposure warrant the heavier coating.
+
+### Polymer-coated fabric (ASTM F668) consists of a metallic-coated steel core wire with a fused and bonded or extruded polymer coating and is specified by class and color; it provides both corrosion resistance and a non-reflective, lower-visibility finish. {note}
+
+## Fabric Wire Gauge {toc}
+
+```datasheet
+label: Fabric Wire Gauge
+type: select
+options:
+ - "11 gauge (0.120 in) — light commercial"
+ - "9 gauge (0.148 in) — standard commercial / industrial"
+ - "6 gauge (0.192 in) — high security"
+default: "9 gauge (0.148 in) — standard commercial / industrial"
+```
+
+### The wire gauge shall be matched to the fence function: light commercial perimeter fence uses 11 or 9 gauge; security fence uses 9 or 6 gauge.
+
+### Fabric wire gauge governs the strength and security rating of the fence; heavier (lower-number) gauges resist cutting and deformation. {note}
+
+## Fabric Mesh Opening {toc}
+
+```datasheet
+label: Fabric Mesh Opening
+type: select
+unit: in
+options:
+ - "2 in (standard commercial / industrial)"
+ - "1 in (security — resists toe-hold and tool insertion)"
+ - "3/8 in (high-security mini-mesh — anti-climb / anti-cut)"
+default: "2 in (standard commercial / industrial)"
+```
+
+### Standard commercial fence uses 2-inch mesh; high-security and anti-climb fence uses smaller openings.
+
+### Mesh opening (the dimension between parallel wires) governs both visibility and the security rating; a smaller mesh opening resists climbing and the insertion of cutting tools but increases material cost and wind solidity. {note}
+
+## Fabric Selvage {toc}
+
+```datasheet
+label: Fabric Selvage — Top
+type: radio
+options:
+ - "Knuckled (smooth — public / pedestrian areas)"
+ - "Twisted / barbed (security — climb deterrent)"
+default: "Knuckled (smooth — public / pedestrian areas)"
+```
+
+```datasheet
+label: Fabric Selvage — Bottom
+type: radio
+options:
+ - "Knuckled (smooth — standard)"
+ - "Twisted / barbed (buried or anti-dig applications)"
+default: "Knuckled (smooth — standard)"
+```
+
+### The top and bottom selvage of the fabric (the finish of the cut wire ends) shall be knuckled or twisted as specified.
+
+### A knuckled selvage presents a smooth, closed loop and is used at the bottom of fence and at the top of fence in public and pedestrian areas; a twisted (barbed) selvage presents protruding twisted ends and is used at the top of security fence to deter climbing. {note}
+
+## Fabric Height {toc}
+
+```datasheet
+label: Chain-Link Fabric Height
+type: select
+unit: ft
+drawing_ref: true
+options:
+ - "4 ft (low perimeter / screening)"
+ - "6 ft (standard commercial perimeter)"
+ - "7 ft (industrial / utility)"
+ - "8 ft (security perimeter)"
+ - "Per fence elevation on drawings"
+default: "6 ft (standard commercial perimeter)"
+```
+
+### Fabric height is the nominal height of the fabric measured from the bottom selvage to the top selvage and does not include barbed-wire or razor-ribbon toppings. {note}
+
+### The overall fence height including topping shall be [[drawing: as indicated on the fence elevations]].
+
+### The fabric shall be installed with the bottom selvage not more than 2 inches above finished grade unless a bottom rail or anti-dig measure is specified, because a larger ground gap defeats the purpose of a security fence.
+
+# Chain-Link Rails, Tension Wire, and Fittings {toc}
+
+## Top Rail and Bottom Rail {toc}
+
+```datasheet
+label: Top Member
+type: radio
+options:
+ - "Top rail (standard commercial)"
+ - "Top tension wire (security — no climbing rail)"
+ - "Top rail with barbed-wire outrigger above"
+default: "Top rail (standard commercial)"
+```
+
+```datasheet
+label: Bottom Member
+type: radio
+options:
+ - "Bottom tension wire"
+ - "Bottom rail (resists push-up / anti-dig)"
+ - "None"
+default: "Bottom tension wire"
+```
+
+### A top rail conforming to ASTM F1083 or F1043 shall be provided continuously along the top of chain-link fence, threaded through line post caps and coupled with expansion sleeves, unless a top tension wire is specified in lieu of a top rail for security fence.
+
+### A bottom rail shall be provided where the drawings require resistance to fabric push-up and animal intrusion at the bottom of the fence.
+
+### A top tension wire allows the fabric to flex and deters the use of the top rail as a climbing aid. {note}
+
+## Tension Wire {toc}
+
+```datasheet
+label: Tension Wire Gauge
+type: radio
+options:
+ - "7 gauge (0.177 in) — standard"
+ - "6 gauge (0.192 in) — heavy / security"
+default: "7 gauge (0.177 in) — standard"
+```
+
+### Tension (coil) wire shall be metallic-coated or polymer-coated steel marcelled tension wire, not lighter than 7 gauge, installed at the top, bottom, or both as specified, and fastened to the fabric to control sag and resist push-up and pull-out of the fabric between posts.
+
+### Tension wire shall match the coating of the fabric for corrosion compatibility.
+
+## Fittings {toc}
+
+```datasheet
+label: Fitting Finish
+type: radio
+options:
+ - "Hot-dip galvanized per ASTM F626"
+ - "Galvanized with polymer color over-coat to match fabric"
+default: "Hot-dip galvanized per ASTM F626"
+```
+
+### All fittings — post and line caps, rail and brace ends, top rail sleeves, tension and brace bands, tension bars, truss-rod assemblies, tie wires, and barbed-wire arms — shall conform to ASTM F626.
+
+### Pressed-steel fittings shall be galvanized after fabrication with a zinc coating not less than 1.20 oz/ft² (366 g/m²), and shall match the framework and fabric finish where a color finish is specified.
+
+### Tension bars shall be one piece, not less than the full height of the fabric, and shall secure the fabric to terminal posts through tension bands spaced not more than 15 inches on center.
+
+## Bracing and Trussing {toc}
+
+### Terminal, corner, and gate posts shall be braced to the adjacent line post with a horizontal brace rail and a diagonal truss rod with a turnbuckle or take-up, so that the tension of the stretched fabric does not pull the terminal post out of plumb.
+
+### Brace and truss assemblies shall be provided at every terminal, corner, pull, and gate post and at intervals along long straight runs as required to maintain fabric tension.
+
+## Fabric Ties {toc}
+
+```datasheet
+label: Fabric Tie Type
+type: radio
+options:
+ - "Aluminum or galvanized tie wires (standard)"
+ - "Tamper-resistant clips / fasteners (security)"
+default: "Aluminum or galvanized tie wires (standard)"
+```
+
+### Fabric shall be fastened to line posts and to top rail or top tension wire with tie wires or clips at intervals not exceeding 12 inches on posts and 24 inches on rails, and shall be fastened to bottom tension wire with hog rings at intervals not exceeding 24 inches.
+
+### For security fence, tamper-resistant fasteners shall be used so that the fabric cannot be readily detached from the framework.
+
+# Ornamental Picket Fence {toc}
+
+## Steel Ornamental Picket Fence {toc}
+
+```datasheet
+label: Steel Ornamental Fence Grade
+type: select
+options:
+ - "Residential grade (ASTM F2408 — light)"
+ - "Commercial grade (ASTM F2408 — medium)"
+ - "Industrial grade (ASTM F2408 — heavy)"
+ - "High-security grade (ASTM F2589)"
+default: "Commercial grade (ASTM F2408 — medium)"
+```
+
+```datasheet
+label: Ornamental Fence Rail Configuration
+type: radio
+options:
+ - "2-rail"
+ - "3-rail (standard commercial security)"
+ - "4-rail (high security / anti-climb)"
+default: "3-rail (standard commercial security)"
+```
+
+```datasheet
+label: Picket Top Treatment
+type: select
+options:
+ - "Flush / smooth top (pedestrian areas)"
+ - "Extended picket (spear / point — climb deterrent)"
+ - "Tri-finial / decorative"
+ - "Per drawings"
+default: "Extended picket (spear / point — climb deterrent)"
+```
+
+### Ornamental tubular steel picket fence shall conform to ASTM F2408 for standard grades, or ASTM F2589 where heavy or high-security grades are specified.
+
+### Pickets, rails, and posts shall be galvanized steel, hot-dip galvanized either before or after forming, with the specified factory-applied polymer or powder-coat finish over the metallic coating.
+
+### Ornamental picket fence is specified by grade (which sets picket size, rail size, and wall thickness), by the rail configuration (number of rails), and by the picket top treatment. {note}
+
+## Aluminum Ornamental Picket Fence {toc}
+
+```datasheet
+label: Ornamental Fence Material
+type: radio
+options:
+ - "Galvanized steel (security and strength governing)"
+ - "Extruded aluminum (corrosion resistance / low maintenance governing)"
+default: "Galvanized steel (security and strength governing)"
+```
+
+### Where corrosion exposure or maintenance considerations warrant, ornamental picket fence shall be extruded aluminum alloy with a factory-applied powder-coat finish.
+
+### Aluminum ornamental fence shall not be substituted for steel where security is the governing function.
+
+### Aluminum ornamental fence does not corrode like steel and is appropriate for coastal and high-moisture environments, but provides lower impact and security resistance than steel of equivalent size. {note}
+
+## Ornamental Fence Finish {toc}
+
+```datasheet
+label: Ornamental Fence Finish Color
+type: select
+drawing_ref: true
+options:
+ - "Black"
+ - "Bronze / dark brown"
+ - "White"
+ - "Per architectural finish schedule"
+default: "Black"
+```
+
+### The factory finish shall be a thermoset powder coat or a fused polymer coating applied over a cleaned and pretreated (and, for steel, galvanized) substrate.
+
+### The color shall be [[drawing: as indicated on the architectural drawings or finish schedule]].
+
+### Field-cut ends and field-drilled holes in steel components shall be touched up with a zinc-rich repair coating per ASTM A780 before the finish coat is repaired, so that the cut does not become a corrosion origin.
+
+# Welded-Wire Mesh Security Fence {toc}
+
+## Welded-Wire Mesh Material {toc}
+
+```datasheet
+label: Welded Mesh Aperture
+type: select
+options:
+ - "Standard square/rectangular mesh"
+ - "Anti-climb narrow aperture (e.g., 3/8 in x 3 in — '358' type)"
+ - "High-security twin-wire mesh"
+default: "Anti-climb narrow aperture (e.g., 3/8 in x 3 in — '358' type)"
+```
+
+```datasheet
+label: Welded Mesh Coating
+type: radio
+options:
+ - "Hot-dip galvanized only"
+ - "Galvanized plus polymer color coat"
+default: "Galvanized plus polymer color coat"
+```
+
+### Welded-wire mesh security fence shall use a rigid panel of welded steel wires conforming to ASTM F2453, mounted on posts.
+
+### Mesh panels shall be hot-dip galvanized and may be polymer-coated for color and added corrosion resistance.
+
+### The close mesh spacing of anti-climb welded mesh (commonly a narrow vertical aperture that defeats finger and toe holds) makes it a high-security alternative to chain-link where a rigid, difficult-to-climb, difficult-to-cut barrier is required. {note}
+
+# Fence Toppings — Barbed Wire and Razor Ribbon {toc}
+
+## Barbed-Wire Outrigger {toc}
+
+```datasheet
+label: Barbed-Wire Topping
+type: radio
+options:
+ - "Not provided"
+ - "3-strand single-arm outrigger (angled outward)"
+ - "6-strand V-arm outrigger (both sides)"
+ - "Per security elevation on drawings"
+default: "Not provided"
+```
+
+```datasheet
+label: Barbed Wire Type
+type: radio
+options:
+ - "ASTM A121 — galvanized, 12-1/2 ga, 4-point barbs at 5 in O.C."
+ - "ASTM F1665 — polymer-coated to match fabric"
+ - "Not applicable — no barbed wire"
+default: "Not applicable — no barbed wire"
+```
+
+### Where a barbed-wire topping is specified, it shall be supported on barbed-wire arms (outriggers) conforming to ASTM F626, capable of supporting a vertical 250 lb load, mounted on the line and terminal posts.
+
+### The arms shall be angled outward (toward the unsecured side), vertical, or in a V configuration as specified, and shall carry the specified number of strands of barbed wire.
+
+### Barbed wire shall conform to ASTM A121 (metallic-coated) or ASTM F1665 (polymer-coated), of the design specified.
+
+## Razor Ribbon / Barbed Tape {toc}
+
+```datasheet
+label: High-Security Topping
+type: radio
+options:
+ - "Not provided"
+ - "Concertina razor coil"
+ - "Flat-wrap razor ribbon"
+ - "Per security design on drawings"
+default: "Not provided"
+```
+
+### Where a higher-security topping is specified, razor ribbon (barbed tape) shall be provided in lieu of or in addition to barbed wire.
+
+### Razor ribbon shall be galvanized or stainless-clad steel-cored barbed tape, supplied as concertina coils or flat-wrap, mounted on the outriggers or along the top of the fence.
+
+### Because razor ribbon is a serious injury hazard, it shall not be installed on fence adjacent to public pedestrian areas.
+
+### The use of razor ribbon shall be coordinated with the Owner's security and risk requirements and any local ordinance limiting its use.
+
+# Posts and Concrete Footings {toc}
+
+## Footing General {toc}
+
+```datasheet
+label: Footing Concrete Strength
+type: radio
+unit: psi
+options:
+ - "2,500 psi (standard fence posts)"
+ - "3,000 psi (gate posts / heavy framework)"
+ - "Per structural design / cast-in-place concrete standard"
+default: "2,500 psi (standard fence posts)"
+```
+
+### Posts shall be set in cast-in-place concrete footings (drilled or formed piers) with a 28-day compressive strength of not less than 2,500 psi unless the structural design or [[sync/cast-in-place-concrete]] requires a higher strength.
+
+### Footings shall be crowned or sloped at the top to shed water away from the post.
+
+### Concrete shall not be placed in footing holes containing standing water or loose material; the hole shall be cleaned to undisturbed bearing material before placement.
+
+### Water ponding at the post groundline is the most common cause of post corrosion failure. {note}
+
+## Footing Size and Embedment — Line Posts {toc}
+
+```datasheet
+label: Line Post Embedment Depth
+type: range
+unit: in
+drawing_ref: true
+options:
+ min: 24
+ max: 48
+ setpoints: [24, 30, 36, 42]
+default: 30
+```
+
+```datasheet
+label: Line Post Footing Diameter
+type: select
+unit: in
+options:
+ - "8 in"
+ - "10 in"
+ - "12 in"
+ - "Per structural design"
+default: "10 in"
+```
+
+### Footing diameter and embedment depth shall be sized for the post function, fence height, wind load, and soil bearing.
+
+### As a minimum for standard fence in ordinary soils, line post footings shall be not less than three times the post diameter in width and shall embed the post not less than the depths scheduled above, increased for taller fence, screened fence, poor soils, or the local frost depth.
+
+### Posts in frost-susceptible soils shall be embedded below the local frost line to prevent frost heave from lifting the post.
+
+## Footing Size and Embedment — Terminal and Gate Posts {toc}
+
+```datasheet
+label: Gate Post Embedment Depth
+type: range
+unit: in
+drawing_ref: true
+options:
+ min: 30
+ max: 60
+ setpoints: [36, 42, 48, 54]
+default: 36
+```
+
+```datasheet
+label: Gate Post Footing Diameter
+type: select
+unit: in
+options:
+ - "12 in"
+ - "16 in"
+ - "18 in"
+ - "Per structural design — sized for gate weight and operating loads"
+default: "Per structural design — sized for gate weight and operating loads"
+```
+
+### Terminal, corner, pull, and gate posts carry concentrated loads — fabric tension at terminals and the cantilevered weight and operating loads of gate leaves at gate posts — and shall have larger and deeper footings than line posts.
+
+### Gate post footings in particular shall be sized for the gate weight, the leaf length, and the dynamic loads of opening and closing, including the loads imposed by an automated operator.
+
+### Undersized gate post footings that allow the gate post to lean are among the most common gate failures and the most expensive to correct after the fact. {note}
+
+## Frost Depth {toc}
+
+```datasheet
+label: Footing Depth Governed by Frost Line
+type: radio
+drawing_ref: true
+options:
+ - "Yes — embed all footings below local frost line"
+ - "No — non-frost region; embedment governed by structural requirements"
+default: "Yes — embed all footings below local frost line"
+```
+
+# Swing Gates {toc}
+
+## Swing Gate Construction {toc}
+
+```datasheet
+label: Swing Gate Configuration
+type: radio
+drawing_ref: true
+options:
+ - "Single-leaf swing"
+ - "Double-leaf swing (drive openings)"
+ - "Per gate schedule on drawings"
+default: "Single-leaf swing"
+```
+
+```datasheet
+label: Swing Gate Leaf Infill
+type: radio
+options:
+ - "Match fence (chain-link fabric)"
+ - "Match fence (ornamental pickets)"
+ - "Match fence (welded mesh)"
+ - "Per gate elevation"
+default: "Match fence (chain-link fabric)"
+```
+
+### Single and double swing gates shall conform to ASTM F900.
+
+### Gate frames shall be fabricated from the framework pipe specified for the fence, welded or assembled with malleable or pressed-steel corner fittings, with the corners trussed by diagonal rods so that the gate leaf does not sag.
+
+### The gate infill shall match the fence (chain-link fabric, ornamental pickets, or welded mesh) unless otherwise specified.
+
+### Gate leaf width and the resulting weight govern the hinge, post, and footing design; long single-leaf swing gates sag and are difficult to operate and should be split into double-leaf gates or replaced with a slide gate.
+
+## Swing Gate Opening Width {toc}
+
+```datasheet
+label: Swing Gate Opening Width
+type: range
+unit: ft
+drawing_ref: true
+options:
+ min: 3
+ max: 24
+ setpoints: [4, 6, 12, 16, 20]
+default: 12
+```
+
+### Gate opening width is the clear opening between gate posts and is established by the drawings to suit the vehicle or pedestrian traffic served.
+
+### Wide vehicle openings shall be double-leaf swing gates or slide gates.
+
+### The single-leaf maximum practical width before sag and operating difficulty become problems is roughly 6 feet for pedestrian and light gates. {note}
+
+## Swing Gate Hinges and Hardware {toc}
+
+```datasheet
+label: Swing Gate Hinge Type
+type: radio
+options:
+ - "Standard galvanized gate hinges (ASTM F900)"
+ - "Non-lift-off security hinges"
+ - "Heavy-duty ball-bearing hinges (automated or heavy gates)"
+default: "Standard galvanized gate hinges (ASTM F900)"
+```
+
+### Hinges shall conform to ASTM F900 and shall be structurally capable of supporting the gate leaf and allowing it to swing freely without binding through repeated open-close cycles.
+
+### Hinges shall be of a non-lift-off design, or shall be installed so that the gate cannot be lifted off its hinges, for security gates.
+
+### The gate shall be provided with the latching and stop hardware specified, including a center stop or drop rod for double-leaf gates, gate stops, and keepers to hold the gate in the open position.
+
+# Slide Gates {toc}
+
+## Slide Gate Type {toc}
+
+```datasheet
+label: Slide Gate Type
+type: radio
+options:
+ - "Cantilever slide (ASTM F1184 Type II — standard vehicular)"
+ - "Overhead slide (ASTM F1184 Type I — limited run-back room)"
+default: "Cantilever slide (ASTM F1184 Type II — standard vehicular)"
+```
+
+### Horizontal slide gates shall conform to ASTM F1184.
+
+### Track-type (V-groove) slide gates running on a ground track are not recommended for automated vehicular use because the ground track is an entrapment and maintenance liability.
+
+### Cantilever slide gates (Type II) span the opening with no support within the opening, supported and guided by roller assemblies on a counterbalance section that extends beyond the opening; they are the standard choice for vehicular openings because they leave the opening clear and have no track in the driving surface to collect debris or ice. {note}
+
+### Overhead-slide gates (Type I) are supported from an overhead beam and are used where the counterbalance run for a cantilever gate is not available. {note}
+
+## Slide Gate Opening Width and Run-Back {toc}
+
+```datasheet
+label: Slide Gate Opening Width
+type: range
+unit: ft
+drawing_ref: true
+options:
+ min: 8
+ max: 40
+ setpoints: [12, 16, 20, 24, 30]
+default: 20
+```
+
+### The Contractor shall verify that the available run-back shown on the drawings is adequate for the specified opening before fabrication.
+
+### A cantilever slide gate requires a run-back (the clear space alongside the opening into which the gate retracts) of approximately 1.5 times the opening width to accommodate the gate leaf plus the counterbalance section; inadequate run-back is a common cantilever-gate coordination error discovered only at installation. {note}
+
+## Slide Gate Ground Clearance and Rollers {toc}
+
+```datasheet
+label: Slide Gate Ground Clearance
+type: radio
+unit: in
+options:
+ - "3 in (standard — grade permitting)"
+ - "Per site grading — coordinate with paving"
+default: "3 in (standard — grade permitting)"
+```
+
+### For cantilever gates with external rollers, the ground clearance beneath the gate leaf shall be approximately 3 inches, grade permitting, so that the gate clears uneven pavement and accumulated debris and ice without binding.
+
+### All exposed rollers and roller assemblies on automated slide gates shall be covered or guarded in accordance with ASTM F2200 so that they do not create a pinch or entrapment hazard.
+
+# Pedestrian Gates {toc}
+
+## Pedestrian Gate Requirements {toc}
+
+```datasheet
+label: Pedestrian Gate Accessibility
+type: radio
+options:
+ - "Accessible route — meets clear width and accessible hardware requirements"
+ - "Not on an accessible route"
+default: "Accessible route — meets clear width and accessible hardware requirements"
+```
+
+```datasheet
+label: Pedestrian Gate Clear Opening Width
+type: radio
+unit: in
+drawing_ref: true
+options:
+ - "36 in (single accessible passage)"
+ - "48 in (wide passage)"
+ - "Per drawings"
+default: "36 in (single accessible passage)"
+```
+
+### Pedestrian gates shall be swing gates conforming to ASTM F900, sized for the required passage width and for accessibility where they serve an accessible route.
+
+### Pedestrian gates on an accessible route shall provide the clear opening width and the maneuvering clearances required by the adopted accessibility standard, and shall be operable with hardware that does not require tight grasping, pinching, or twisting of the wrist.
+
+### Pedestrian gates shall be separated from automated vehicular gates; pedestrians shall never be routed through a moving vehicular gate, which is a fundamental ASTM F2200 safety principle.
+
+# Automated Vehicular Gate Operators {toc}
+
+## Operator Listing and Usage Class {toc}
+
+```datasheet
+label: Gate Operator Usage Class (UL 325)
+type: select
+options:
+ - "Class I — residential (single-family)"
+ - "Class II — commercial / general access (multi-family, school, retail)"
+ - "Class III — industrial / limited access (factory, loading dock)"
+ - "Class IV — restricted access (guarded industrial, airport, high-security)"
+default: "Class III — industrial / limited access (factory, loading dock)"
+```
+
+### Every automated vehicular gate operator shall be listed to UL 325 and shall be selected for the correct usage class for the installation.
+
+### UL 325 defines four usage classes by the type of property served, and the required entrapment-protection and access provisions differ by class. {note}
+
+### Selecting the wrong usage class — for example, a Class I residential operator on a Class III commercial gate — produces a non-compliant installation regardless of the operator's listing. {note}
+
+## Operator Type and Power {toc}
+
+```datasheet
+label: Gate Operator Type
+type: radio
+options:
+ - "Slide-gate operator (cantilever / overhead slide)"
+ - "Swing-gate operator (single or dual arm)"
+ - "Per gate type on drawings"
+default: "Slide-gate operator (cantilever / overhead slide)"
+```
+
+```datasheet
+label: Operator Power Supply
+type: select
+drawing_ref: true
+options:
+ - "120 VAC single phase"
+ - "208-240 VAC single phase"
+ - "Solar with battery (remote sites)"
+ - "Per electrical drawings"
+default: "120 VAC single phase"
+```
+
+```datasheet
+label: Standby / Backup Operation
+type: radio
+options:
+ - "Battery backup for continued operation on power loss"
+ - "Manual release only on power loss"
+ - "Per Owner requirement"
+default: "Battery backup for continued operation on power loss"
+```
+
+### The operator type shall match the gate type — slide-gate operator for cantilever and overhead-slide gates, swing-gate operator for swing gates.
+
+### The operator shall be sized for the gate leaf weight and length and the duty cycle.
+
+### Power supply, conduit, and disconnect shall be coordinated with the electrical scope.
+
+### Where standby operation is required during a power outage, a battery backup or a manual-release means shall be provided.
+
+# Gate Safety and Entrapment Protection {toc}
+
+## Inherent Entrapment Sensing {toc}
+
+### Every automated vehicular gate operator shall include an inherent (Type A) entrapment-sensing means that stops and reverses the gate when it contacts an obstruction.
+
+### The inherent sensor is the operator's built-in obstruction detection and is the first of the required means of entrapment protection; it alone is not sufficient, because UL 325 requires at least two independent means of entrapment protection for each direction of gate travel. {note}
+
+## Independent Entrapment-Protection Devices {toc}
+
+```datasheet
+label: Entrapment Protection — Closing Direction
+type: select
+options:
+ - "Photoelectric sensor (Type B1) — non-contact"
+ - "Sensing edge (Type B2) — contact"
+ - "Both photo eye and sensing edge"
+default: "Both photo eye and sensing edge"
+```
+
+```datasheet
+label: Entrapment Protection — Opening Direction
+type: select
+options:
+ - "Photoelectric sensor (Type B1) — non-contact"
+ - "Sensing edge (Type B2) — contact"
+ - "Both photo eye and sensing edge"
+default: "Both photo eye and sensing edge"
+```
+
+### In addition to the inherent sensor, each direction of gate travel shall be protected by at least one independent external entrapment-protection device — either a Type B1 non-contact device (photoelectric sensor or photo eye) or a Type B2 contact device (a sensing edge that reverses the gate on contact).
+
+### The devices shall be located to protect every entrapment zone the gate creates: the leading edge of the gate in the closing direction, the trailing edge and the run-back zone of a slide gate in the opening direction, and the pinch points between the moving gate and fixed framework, posts, and walls.
+
+### The two means in each direction shall be independent so that the failure of one does not disable both.
+
+### A single device cannot satisfy the two-means requirement, and an inherent sensor plus a single photo eye is the practical minimum; sensing edges on the leading and trailing edges of the gate provide contact protection where a non-contact sensor cannot see a low or thin obstruction. {note}
+
+## Gate Construction for Automation (ASTM F2200) {toc}
+
+```datasheet
+label: ASTM F2200 Gate Construction Requirements (verify all that apply)
+type: checkbox
+options:
+ - "No openings in the gate that would allow a 2-1/4 in sphere to pass in the area a person could reach through (reduces reach-through entrapment)"
+ - "Exposed rollers covered or guarded"
+ - "Gate restrained so it cannot fall over if disconnected or derailed"
+ - "No protrusions or sharp edges on the gate or in the travel path"
+ - "Pinch and entrapment zones between gate and fixed structure guarded or screened"
+ - "Gate guided so it cannot leave its supports during normal operation"
+default: "Exposed rollers covered or guarded"
+```
+
+### Every gate that is, or is designed to be, automated shall be constructed in accordance with ASTM F2200.
+
+### The ASTM F2200 construction requirements listed in the datasheet above shall be reflected in the gate fabrication and installation.
+
+### The gate construction requirements exist because automating a gate turns a passive barrier into a powered machine, and the gate must be built so that it does not catch, crush, or fall on a person. {note}
+
+## Warning Signage and Controls Location {toc}
+
+```datasheet
+label: Manual Control Location
+type: radio
+options:
+ - "Within clear sight of the gate, minimum required distance from gate travel"
+ - "Remote with no line of sight — PROHIBITED for override controls"
+default: "Within clear sight of the gate, minimum required distance from gate travel"
+```
+
+### Warning placards advising that the gate is automated and may move without warning shall be posted on both sides of the gate.
+
+### Manually operated controls (push buttons, key switches) that can override entrapment protection shall be located so that the operator of the control has a clear, unobstructed view of the entire gate and its travel path and is at least the required distance from the moving gate, so that the gate cannot be operated by a person who cannot see it.
+
+# Gate Hardware and Access Control Provisions {toc}
+
+## Locking and Latching Hardware {toc}
+
+```datasheet
+label: Gate Locking Provision
+type: select
+options:
+ - "Manual latch with padlock provision"
+ - "Electric strike (powered by others)"
+ - "Magnetic lock (powered by others)"
+ - "Integral to gate operator (slide / swing)"
+default: "Manual latch with padlock provision"
+```
+
+### Gate latching, locking, and stop hardware shall be galvanized or finished to match the gate and shall be of sufficient strength for the gate function.
+
+### Manual gates shall be provided with the latch and padlock provisions specified.
+
+### Where electric locking is specified — electric strikes, magnetic locks, or solenoid-operated latches — the locking hardware and its rough-in shall be coordinated with the access-control scope.
+
+## Access Control Interface {toc}
+
+```datasheet
+label: Access Control Wiring Division
+type: radio
+options:
+ - "This contract: conduit, boxes, pull strings, and operator terminations only"
+ - "This contract: complete operator wiring; access-control head end by others"
+ - "Per project responsibility matrix on drawings"
+default: "This contract: conduit, boxes, pull strings, and operator terminations only"
+```
+
+```datasheet
+label: Vehicle Detection / Free-Exit Loops
+type: select
+options:
+ - "Inductive loops installed by this contract, connected by access-control"
+ - "Loops furnished and connected by access-control installer"
+ - "Not required"
+default: "Inductive loops installed by this contract, connected by access-control"
+```
+
+### The Contractor shall provide the conduit, junction boxes, and pull strings for the access-control wiring at each automated or electrically locked gate, and shall terminate the gate operator's safety, control, and free-exit inputs as required for connection by the access-control installer.
+
+### The division of responsibility shall be confirmed at the pre-installation conference so that the gate is left ready for connection and no interface is omitted between scopes.
+
+### The credential readers, intercoms, keypads, free-exit loops, the gate controller, and the head-end logic that decide when the gate opens are furnished and connected under [[sync/access-control-systems]]. {note}
+
+# Grounding and Bonding {toc}
+
+## Fence and Gate Grounding {toc}
+
+```datasheet
+label: Fence Grounding Required
+type: radio
+drawing_ref: true
+options:
+ - "Yes — fence within influence of power lines / electrified equipment"
+ - "Yes — at powered gate operators only"
+ - "No — not required for this installation"
+default: "Yes — at powered gate operators only"
+```
+
+### Fence and gate framework shall be grounded and bonded where required by the adopted electrical code, particularly where the fence is within the zone of influence of high-voltage equipment, near overhead power lines, or at electrically powered gate operators.
+
+### Grounding electrode conductors, ground rods, and bonding jumpers shall be installed at the intervals and locations shown on the drawings.
+
+### Metallic fence near power lines can accumulate dangerous induced voltages, and powered gate equipment shall be grounded for both fault clearing and lightning protection. {note}
+
+# Installation {toc}
+
+## Layout and Grade {toc}
+
+### The fence line shall be staked and the post locations laid out from the contract drawings before any footing is excavated.
+
+### The Contractor shall verify that the staked line clears all underground utilities, using utility locates and hand-digging within tolerance zones.
+
+### Where the fence crosses changing grade, the framework shall follow the grade in stepped or raked sections as the fabric type allows; chain-link fabric can be raked to follow a uniform slope, while rigid ornamental and welded-mesh panels are stepped.
+
+### The bottom-of-fence clearance to grade shall be maintained within the limits specified for the fence function.
+
+## Post Setting {toc}
+
+### Posts shall be set plumb in their footings, at the correct line and spacing, and shall not be disturbed until the concrete has attained sufficient strength to resist construction loads.
+
+### Fabric and gate leaves shall not be hung until the footings have cured.
+
+### Posts set out of plumb, or footings loaded before cure, are common and visible defects. {note}
+
+## Fabric Installation {toc}
+
+### Chain-link fabric shall be stretched taut with a fabric stretcher, fastened to terminal posts with a full-height tension bar and tension bands, and tied to line posts, rails, and tension wire at the specified intervals.
+
+### The fabric shall be uniformly tensioned so that it does not sag or wave between posts.
+
+### Fabric installation shall conform to ASTM F567.
+
+## Gate Installation and Adjustment {toc}
+
+### Gates shall be hung plumb and shall swing or slide freely through their full travel without binding, dragging, or contacting the ground.
+
+### Swing gates shall be adjusted so the leaf does not sag, and the truss rods shall be tensioned to remove sag.
+
+### Slide gates shall be adjusted so the rollers carry the leaf smoothly and the gate stops at the correct open and closed positions.
+
+### Automated gates shall be adjusted, and their limit and obstruction settings configured, in accordance with the operator manufacturer's instructions and tested for compliance before the gate is placed in service.
+
+## Field Repair of Coatings {toc}
+
+```datasheet
+label: Field Coating Repair Material
+type: radio
+options:
+ - "Zinc-rich repair coating per ASTM A780"
+ - "Cold-galvanizing compound plus color touch-up to match finish"
+default: "Zinc-rich repair coating per ASTM A780"
+```
+
+### Field cuts, drilled holes, welds, and abrasions that expose bare steel shall be repaired with a zinc-rich repair coating conforming to ASTM A780, and the factory color finish shall be touched up to match.
+
+### Bare steel left at a field cut is the most common origin of premature corrosion in an otherwise galvanized fence. {note}
+
+# Field Testing and Acceptance {toc}
+
+## Gate Operation Test {toc}
+
+### Each gate shall be operated through its full range of travel and demonstrated to swing or slide freely without binding, to latch and lock as specified, and to stop at the correct positions.
+
+### Automated gates shall be cycled to confirm the operator opens and closes the gate fully, stops and reverses on the inherent sensor, and responds correctly to each independent entrapment-protection device.
+
+## Entrapment-Protection Test {toc}
+
+```datasheet
+label: Entrapment-Protection Acceptance Test
+type: radio
+options:
+ - "Required — test every device in every direction, documented before energizing"
+ - "Not applicable — no automated gates"
+default: "Required — test every device in every direction, documented before energizing"
+```
+
+### Each entrapment-protection device on every automated gate shall be tested by simulating an obstruction in its protected zone and confirming that the gate stops and reverses (in the closing direction) or stops (in the opening direction) as required.
+
+### The test shall be performed for each direction of travel and for each device, and the results shall be documented in the closeout certification.
+
+### A gate shall not be placed in service until every required entrapment-protection device has been tested and confirmed to function.
+
+## Plumb, Alignment, and Tension Check {toc}
+
+### The completed fence shall be checked for post plumb, line alignment, uniform fabric or panel tension, correct height, and the specified ground clearance.
+
+### Sagging fabric, out-of-plumb posts, leaning gate posts, and gates that drag or bind shall be corrected before acceptance.
+
+# Delivery, Storage, and Handling {toc}
+
+## Material Storage and Handling {toc}
+
+```datasheet
+label: Material Storage
+type: radio
+options:
+ - "Off ground, dry, ventilated; operators stored indoors"
+ - "Per manufacturer's storage instructions"
+default: "Off ground, dry, ventilated; operators stored indoors"
+```
+
+### Fence materials shall be delivered and stored so that coatings are not damaged.
+
+### Galvanized and polymer-coated framework and fabric shall be stored off the ground on supports, kept dry and ventilated, and not stored in tight bundles where trapped moisture causes wet-storage staining (white rust) on galvanized surfaces.
+
+### Polymer-coated and powder-coated components shall be protected from abrasion and impact that chip the finish.
+
+### Gate operators and their electronics shall be stored indoors, protected from weather, until installed.
+
+### Damaged materials, and galvanized materials with significant wet-storage staining, shall not be installed.
+
+# Warranty {toc}
+
+## Installation Warranty {toc}
+
+```datasheet
+label: Fence and Gate Installation Warranty
+type: select
+options:
+ - "1 year from substantial completion"
+ - "2 years from substantial completion"
+default: "1 year from substantial completion"
+```
+
+### The Contractor shall warrant the fence and gate installation, including framework, fabric, gates, hardware, and the achievement of plumb, tension, and free operation, for the project warranty period beginning at substantial completion.
+
+### Warranty obligations include correction of post heave and lean, fabric sag, gate sag and binding, coating failure not attributable to abuse, and gate operator malfunction.
+
+## Manufacturer Warranties {toc}
+
+```datasheet
+label: Gate Operator Manufacturer Warranty
+type: select
+options:
+ - "1 year"
+ - "2 years"
+ - "5 years (heavy-duty operators)"
+ - "Per manufacturer standard warranty"
+default: "Per manufacturer standard warranty"
+```
+
+### The manufacturer warranties for polymer and powder-coat finishes and for the gate operators shall be assigned to the Owner and shall run from substantial completion.
+
+### The Contractor shall provide the manufacturer warranty documentation for finishes and operators at closeout.
+
+# Spare Parts {toc}
+
+## Spare Parts and Tools {toc}
+
+```datasheet
+label: Spare Parts and Tools
+type: checkbox
+options:
+ - "Manual-release keys / tools for each automated gate"
+ - "Operator programming / limit-setting tool"
+ - "Manufacturer-recommended spare entrapment-protection devices"
+ - "Spare fabric ties and fittings"
+default: "Manual-release keys / tools for each automated gate"
+```
+
+### The Contractor shall provide the spare parts and special tools required to maintain the gate operators and access provisions, as specified.
+
+### Where automated gates are provided, the Contractor shall furnish, at a minimum, the manual-release keys or tools and any proprietary programming or limit-setting tool required for routine adjustment, and shall turn over the operator manufacturer's recommended spare-parts list.