+---
+title: Sectional Overhead Doors
+category: Architectural / Openings
+toc_depth: 3
+description: >
+ When to use: Upward-acting sectional overhead doors whose horizontal panels (sections) hinge together and track horizontally beneath the ceiling when open, serving loading docks, drive-through service openings, parking garages, warehouses, and light-industrial buildings. Covers insulated (foamed polyurethane sandwich), non-insulated (ribbed or pan steel), and full-vision aluminum-and-glazing doors; panel material, gauge, thickness, and finish; vision lites and glazing; weatherseals and air-infiltration class; torsion and extension counterbalance and cycle-life rating; track and lift configuration selected by available headroom and sideroom; wind-load design pressure and reinforcement; manual chain-hoist and motor operation with UL 325 entrapment protection; installation, field testing including the safety-reverse test, and warranty.
+ Not intended for: Overhead coiling and rolling doors and coiling grilles whose curtain rolls onto a barrel above the opening (see [[sync/overhead-coiling-doors]]); high-speed fabric or rubber roll-up doors; fire-rated rolling doors and counter shutters (fire-rated openings in this category are normally protected by rolling assemblies, see [[sync/overhead-coiling-doors]]); swinging or sliding hollow-metal doors and frames (see [[sync/doors-frames-and-hardware]]); impact traffic doors; and loading-dock equipment such as levelers, seals, and shelters.
+---
+
+# Scope
+
+This standard covers the furnishing, installation, and commissioning of upward-acting sectional overhead doors in commercial, institutional, and industrial construction. The scope includes insulated and non-insulated steel sectional doors, full-vision aluminum sectional doors, the counterbalance and track systems that raise them, weatherseals, manual and motorized operation, and the entrapment-protection devices required for powered doors. Opening sizes, locations, and wind-load design pressures shall be as indicated on the contract drawings; this standard establishes the minimum performance, material, fabrication, operation, installation, and inspection requirements that apply to each scheduled opening.
+
+A sectional door is an assembly of two or more horizontal sections, hinged edge-to-edge, that travels in a pair of vertical jamb tracks and then turns onto horizontal tracks that carry the open door beneath the ceiling. A counterbalance — a torsion spring on a shaft above the opening, or extension springs alongside the horizontal tracks — offsets the weight of the sections through their travel so that the door can be raised by hand or by an operator sized for the residual load. Because the sections fold flat overhead rather than coiling, a sectional door is selected where the headroom above the opening and the depth of ceiling behind it can accommodate the open door, and where the panel construction (insulation, vision, finish) matters to the building. The trade-off against a coiling door is that a sectional door consumes ceiling depth when open and needs a defined headroom; that geometry is the single most important coordination item and drives the track and lift selection in this standard.
+
+A sectional door is engineered for its opening. The spring counterbalance, the section weight, the track radius and lift, the wind-load reinforcement, and the operator are matched to the specific width, height, and design load. A sectional door is not a catalog commodity that can be cut to fit in the field; each unit is fabricated and balanced for its opening and its loads. Coordinate this work with the structural and masonry trades that form the opening and provide the jambs and header to which tracks and the spring anchor pad attach (see [[sync/doors-frames-and-hardware]] for adjacent hollow-metal openings); with the electrical trade for power and control wiring to motor operators; with [[sync/air-barriers]] and [[sync/joint-sealants]] for the seal of the door frame to the wall air and water barrier; and with [[sync/building-thermal-insulation]] where an insulated door closes a conditioned envelope.
+
+# Referenced Standards
+
+Materials, fabrication, testing, and installation shall comply with the latest adopted edition of the referenced standards. Where the contract documents or the adopted building code impose more stringent requirements than a referenced standard, the more stringent requirement shall govern. The Contractor shall resolve conflicts in writing with the Engineer of Record before proceeding.
+
+| Standard | Title |
+|----------|-------|
+| ANSI/DASMA 102 | Specifications for Sectional Doors (the core product standard for residential and commercial sectional doors — construction, counterbalance, cycle life, and component conventions) |
+| ANSI/DASMA 105 | Test Method for Thermal Transmittance and Air Infiltration of Garage Doors |
+| ANSI/DASMA 107 | Room Fire Test Standard for Garage Doors Using Foam Plastic Insulation |
+| ANSI/DASMA 108 | Standard Method for Testing Sectional Garage Doors and Rolling Doors: Determination of Structural Performance Under Uniform Static Air Pressure Difference |
+| ANSI/DASMA 109 | Standard Method for Testing Garage Doors: Determination of Cycle Life |
+| ANSI/DASMA 115 | Standard Method for Testing Sectional Garage Doors and Rolling Doors: Determination of Structural Performance Under Missile Impact and Cyclic Wind Pressure |
+| ANSI/DASMA 116 | Standard for Section Interfaces on Residential Garage Door Systems (pinch-resistant section joint) |
+| ANSI/UL 325 | Standard for Door, Drapery, Gate, Louver, and Window Operators and Systems |
+| ASTM E330 | Standard Test Method for Structural Performance of Exterior Windows, Doors, Skylights, and Curtain Walls by Uniform Static Air Pressure Difference |
+| ASTM E283 | Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors Under Specified Pressure Differences |
+| ASTM E1886 | Standard Test Method for Performance of Exterior Windows, Doors, Shutters, and Impact Protective Systems Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials |
+| ASTM E1996 | Standard Specification for Performance of Exterior Windows, Doors, Shutters, and Impact Protective Systems Impacted by Windborne Debris |
+| ASTM C1363 | Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus |
+| ASTM A653 | Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process |
+| DASMA TDS-163 | U-Factor and R-Value for Residential and Commercial Garage Doors (tested-vs-calculated thermal reporting) |
+| NEMA 250 | Enclosures for Electrical Equipment (1000 Volts Maximum) — operator and control enclosure ratings |
+| NFPA 70 | National Electrical Code (operator power, control, and interlock wiring) |
+| ASCE 7 | Minimum Design Loads and Associated Criteria for Buildings and Other Structures (wind-load determination) |
+| ANSI/DASMA 116t / DASMA TDS-155 | DASMA Garage Door and Commercial Door Wind Load Guide (code wind-pressure correlation) |
+
+# Submittals
+
+## Action Submittals
+
+The following submittals shall be submitted for review and returned before fabrication or procurement begins. Because each sectional door is engineered for its opening and loads, the submittal shall be specific to the door schedule and shall not consist of generic catalog literature alone.
+
+**Door Schedule:** A complete schedule listing every sectional door by mark number, including opening width and height, door type (insulated, non-insulated, full-vision), section thickness, panel material and gauge, insulation R-value where applicable, design wind-load pressure where applicable, track and lift type, operation type, and finish.
+
+**Shop Drawings:** Fabrication and installation drawings for each door type showing section profile and joint detail, track configuration and radius, required headroom and sideroom, counterbalance shaft and spring data, bottom-section and bottom-seal detail, vision-lite layout where applicable, wind-load reinforcement (struts and posts), anchorage of tracks and the spring anchor pad to the structure, and operator mounting. Drawings shall indicate the clearances the door requires so that the opening and the surrounding construction can be verified before fabrication.
+
+**Product Data:** Manufacturer's technical data for the sections, finish system, glazing, weatherseals, counterbalance, operator, controls, and entrapment-protection devices.
+
+**Structural and Wind-Load Calculations:** For doors with a specified design pressure, structural calculations or a current test report demonstrating compliance with ANSI/DASMA 108 or ASTM E330 (and ANSI/DASMA 115 or ASTM E1886/E1996 where windborne-debris resistance is required) at the design pressure for the opening, including the strut and reinforcement schedule.
+
+**Thermal and Air-Infiltration Test Data:** For insulated doors on conditioned openings, the R-value or U-factor reported in accordance with ANSI/DASMA 105 (tested installed door) or DASMA TDS-163 (calculated section), with the reporting basis clearly identified, and the air-infiltration rate per ASTM E283.
+
+**Operator and UL 325 Compliance Documentation:** For powered doors, the operator listing, the NEMA enclosure rating of the operator and control station, the entrapment-protection scheme, the wiring diagram, and confirmation that the operator and its monitored safety devices comply with the edition of UL 325 in force.
+
+```datasheet
+label: Action Submittals Required
+type: checkbox
+options:
+ - "Door schedule cross-referenced to drawings"
+ - "Shop drawings with clearance, track, and anchorage details"
+ - "Product data for sections, finish, glazing, seals, operator, and controls"
+ - "Structural / wind-load calculations or test report (where design pressure specified)"
+ - "Thermal R-value / U-factor and air-infiltration test data (insulated doors)"
+ - "Operator wiring diagram and UL 325 entrapment-protection documentation (powered doors)"
+default: "Door schedule cross-referenced to drawings"
+```
+
+## Closeout Submittals
+
+At substantial completion the Contractor shall provide the following before final acceptance.
+
+- Operation and maintenance manuals for each door type, including lubrication points, spring-tension adjustment procedure, recommended maintenance frequency per ANSI/DASMA 102, and operator and control programming
+- Final as-built door schedule reflecting field conditions
+- Warranty documentation from the door manufacturer and the operator manufacturer
+- For powered doors, the record of the UL 325 entrapment-protection functional test and the safety-reverse test
+- The manufacturer's safety warnings regarding spring tension and the prohibition on adjusting or removing the counterbalance by untrained personnel
+
+```datasheet
+label: Closeout Submittals Required
+type: checkbox
+options:
+ - "Operation and maintenance manuals"
+ - "Final as-built door schedule"
+ - "Warranty documentation (door and operator)"
+ - "UL 325 entrapment-protection and safety-reverse test record (powered doors)"
+ - "Counterbalance safety-warning package to Owner"
+default: "Operation and maintenance manuals"
+```
+
+# Quality Assurance
+
+## Manufacturer Qualifications
+
+The sectional door manufacturer shall demonstrate a minimum of five years of continuous production of sectional overhead doors of the types and sizes required on the project and shall furnish, in accordance with ANSI/DASMA 102, standard installation and operation instructions with warnings and a listing of components requiring regular maintenance.
+
+## Installer Qualifications
+
+The installer shall be a firm trained and authorized by the door manufacturer to install, balance, and adjust the products supplied. Counterbalance springs store substantial energy; the installer shall be trained in safe winding, tensioning, and release of torsion and extension springs.
+
+## Single-Source Responsibility
+
+```datasheet
+label: Single-Source Responsibility
+type: radio
+options:
+ - "Door, counterbalance, operator, and controls from one manufacturer or its authorized system"
+ - "Operator and controls by others, coordinated by the door manufacturer"
+default: "Door, counterbalance, operator, and controls from one manufacturer or its authorized system"
+```
+
+Single-source responsibility is preferred because the counterbalance, the section weight, the track engagement, and the operator must be matched as a system; splitting responsibility across vendors creates a coordination gap precisely at the interface that determines whether the door is balanced and whether the operator can move the door without overloading.
+
+## Wind-Load and Impact Certification
+
+Where the adopted code requires the door to resist a design wind pressure, and in windborne-debris regions where it must additionally resist impact, the door type and size furnished shall be covered by a current structural test report or engineering calculation at or above the required pressure and impact class. A door selected from a catalog without verifying that its tested size envelope covers the actual opening is the most common wind-rating failure; the reinforcement schedule shall be specific to the scheduled width.
+
+# Environmental and Service Conditions
+
+Sectional doors are engineered assemblies, and the most common in-service failures trace to a service condition that was understated at procurement: a door selected without the wind-load rating the code required for its location, an uninsulated door on a conditioned opening, or a light-duty spring on a door cycled hundreds of times a day. The requirements in this section stand independent of the catalog model and shall be satisfied for the specific opening.
+
+## Wind Load
+
+### Design Wind Pressure
+
+The design wind pressure for each exterior sectional door shall be determined in accordance with ASCE 7 for the building's risk category, basic wind speed, exposure, and the door's height and location on the wall, including the higher pressures that apply at building corners and edge zones. Manufacturers publish wind-load tables, but the design pressure is a property of the building and the opening, not of the door; it shall be established by the design team and indicated on the drawings.
+
+```datasheet
+label: Design Wind Pressure (positive/negative, ASCE 7)
+type: range
+unit: psf
+options:
+ min: 15
+ max: 100
+ setpoints: [15, 20, 25, 30, 40, 50, 60, 70, 80, 100]
+drawing_ref: true
+default: 30
+```
+
+### Structural Test Method
+
+Each exterior sectional door shall be designed and, where required, tested to withstand the design wind pressure without permanent deformation that impairs operation, demonstrated under uniform static air pressure in accordance with ANSI/DASMA 108 or ASTM E330.
+
+```datasheet
+label: Wind-Load Structural Verification
+type: radio
+options:
+ - "Manufacturer wind-load table covering the design pressure"
+ - "Test report to ANSI/DASMA 108 / ASTM E330 at the design pressure"
+ - "Not required (interior door)"
+default: "Manufacturer wind-load table covering the design pressure"
+```
+
+### Windborne-Debris Resistance
+
+In windborne-debris regions, exterior sectional doors shall additionally resist large- and small-missile impact and the subsequent cyclic pressure loading in accordance with ASTM E1886 and the impact classification of ASTM E1996, or the missile-impact and cyclic-wind method of ANSI/DASMA 115. Windborne-debris resistance is a separate requirement from static wind pressure; a door rated for the static pressure is not necessarily impact-rated.
+
+```datasheet
+label: Windborne-Debris (Impact) Rating Required
+type: radio
+options:
+ - "No — outside windborne-debris region"
+ - "Yes — large- and small-missile impact per ASTM E1886/E1996"
+ - "Yes — missile impact and cyclic wind per ANSI/DASMA 115"
+drawing_ref: true
+default: "No — outside windborne-debris region"
+```
+
+## Thermal Service
+
+Where the door closes a conditioned envelope, an insulated section shall be specified and the building's energy code may set a maximum U-factor or minimum R-value for the door. An uninsulated door on a heated warehouse is a large uninsulated hole in the envelope and a frequent source of comfort complaints and condensation; conversely, an insulated door on an unconditioned shed adds cost without benefit. Match the insulation to whether the space behind the door is conditioned.
+
+## Duty Cycle
+
+The expected number of daily open/close cycles drives the spring cycle-life selection and the operator duty class. A dock door at a busy distribution center may cycle hundreds of times a day; an infrequently used drive-through opens a few times. Under-rating the spring for the actual duty is the leading cause of mid-life spring failure.
+
+## Corrosive and Coastal Exposure
+
+Doors in coastal, washdown, food-processing, or chemically aggressive environments shall be furnished with corrosion-resistant materials and finishes (galvanized with a full paint system, aluminum, or stainless hardware) and the operator and controls in an enclosure rated for the exposure. Specify the exposure so that the section finish, the spring and hardware coatings, and the operator NEMA enclosure are all selected for it.
+
+```datasheet
+label: Service Environment
+type: radio
+options:
+ - "Interior / dry — standard"
+ - "Exterior, normal exposure"
+ - "Coastal / corrosive / washdown — enhanced corrosion protection"
+default: "Exterior, normal exposure"
+```
+
+# Door Construction and Performance
+
+## Door Type
+
+The door type sets the panel construction and drives most downstream selections. Insulated doors use a foamed polyurethane core sandwiched between steel skins and are the default for conditioned and most exterior commercial openings. Non-insulated doors use a single-skin ribbed or pan-formed steel section and suit unconditioned and interior openings where thermal performance is not required. Full-vision doors use aluminum rails and stiles glazed with glass or polycarbonate and are selected for showrooms, car washes, restaurants, and any opening where daylight and visibility through the closed door are wanted.
+
+```datasheet
+label: Door Type
+type: radio
+options:
+ - "Insulated steel — foamed polyurethane sandwich section"
+ - "Non-insulated steel — single-skin ribbed or pan section"
+ - "Full-vision aluminum — glazed rail-and-stile section"
+drawing_ref: true
+default: "Insulated steel — foamed polyurethane sandwich section"
+```
+
+## Section Thickness
+
+Section thickness contributes to both thermal performance and panel stiffness. Thicker sections carry more insulation and span wider openings against wind with less reinforcement. Commercial sectional doors are produced from about 1-3/8 in. through 3 in. thick.
+
+```datasheet
+label: Section Thickness
+type: select
+unit: in.
+options:
+ - "1-3/8 in. — light commercial, non-insulated or lightly insulated"
+ - "1-5/8 in. — standard insulated commercial"
+ - "2 in. — heavy insulated commercial / higher R-value"
+ - "3 in. — maximum insulation and span"
+default: "2 in. — heavy insulated commercial / higher R-value"
+```
+
+## Insulation R-Value
+
+Where an insulated door is specified, the section shall achieve the specified thermal value. Procurable foamed-polyurethane commercial sections commonly reach an installed R-value in the range of about R-6 to R-26 depending on thickness and skin construction.
+
+The reporting basis matters and shall be confirmed. Under DASMA TDS-163, a "calculated" R-value applies only to a portion of an individual section and is not comparable to the "tested installed door" U-factor produced by ANSI/DASMA 105 testing of a complete door; the tested whole-door value is lower because it accounts for the section joints, the perimeter, and thermal bridging that the calculated section value ignores. The specifier shall require the value to be reported on a stated basis and should specify the ANSI/DASMA 105 tested basis where the energy code compliance depends on it, so that submittals are compared on equal terms.
+
+```datasheet
+label: Insulated Section R-Value
+type: range
+unit: hr·ft²·°F/Btu
+options:
+ min: 6
+ max: 26
+ setpoints: [6, 9, 12, 16, 18, 20, 26]
+default: 16
+```
+
+```datasheet
+label: R-Value Reporting Basis
+type: radio
+options:
+ - "Tested installed door (U-factor per ANSI/DASMA 105) — required where energy code compliance depends on it"
+ - "Calculated section R-value (DASMA TDS-163) — section-only, not a whole-door value"
+default: "Tested installed door (U-factor per ANSI/DASMA 105) — required where energy code compliance depends on it"
+```
+
+## Panel Material and Gauge
+
+The steel skin gauge shall be selected for the opening size, the design wind pressure, and the durability the service demands; larger and higher-pressure openings and higher-traffic dock environments warrant heavier skins. The default below covers typical commercial insulated sections.
+
+```datasheet
+label: Steel Skin Material
+type: radio
+options:
+ - "Galvanized steel, ASTM A653 (standard)"
+ - "Galvanized steel with full factory paint system (coastal / corrosive)"
+default: "Galvanized steel, ASTM A653 (standard)"
+```
+
+```datasheet
+label: Exterior Skin Gauge
+type: radio
+options:
+ - "26 gauge — light commercial"
+ - "24 gauge — standard commercial"
+ - "20 gauge — heavy-duty / high-traffic / high-wind"
+drawing_ref: true
+default: "24 gauge — standard commercial"
+```
+
+## Glazing and Vision Lites
+
+Vision lites admit daylight and let occupants see through or past the door. They shall be sized and located on the door schedule. Glazing in a door subject to wind load, impact, or human contact shall meet the safety-glazing and, where applicable, impact requirements for its location; in windborne-debris regions, glazed sections shall be part of the impact-rated assembly.
+
+```datasheet
+label: Vision Lites
+type: radio
+options:
+ - "None"
+ - "One row of lites in a designated section"
+ - "Full-vision (glazed throughout) — aluminum door"
+drawing_ref: true
+default: "None"
+```
+
+```datasheet
+label: Glazing Material
+type: select
+options:
+ - "Insulated glass (dual pane) — conditioned openings"
+ - "Single-pane tempered glass"
+ - "Clear polycarbonate — impact / vandal resistance"
+ - "Acrylic (DSB) — economy, interior"
+default: "Insulated glass (dual pane) — conditioned openings"
+```
+
+## Air Infiltration
+
+Exterior doors on conditioned buildings shall have a maximum air-infiltration rate verified in accordance with ASTM E283 (or the air-infiltration method of ANSI/DASMA 105) at the specified test pressure. A sectional door leaks primarily at the bottom seal, the jamb seals, the header seal, and the section joints, so the infiltration limit drives the weatherseal package.
+
+```datasheet
+label: Maximum Air Infiltration (ASTM E283 at 1.57 psf / 25 mph)
+type: range
+unit: cfm/sf
+options:
+ min: 0.2
+ max: 1.0
+ setpoints: [0.2, 0.3, 0.4, 0.6, 0.8, 1.0]
+default: 0.4
+```
+
+# Counterbalance and Tracks
+
+## Counterbalance Type
+
+The counterbalance offsets the section weight so the door can be raised by hand or by an operator sized for the residual load. A torsion-spring counterbalance — one or more springs on a shaft above the header, with cables to the bottom section — is the standard for commercial doors because it gives precise balance, longer life, and contained failure. Extension springs, mounted alongside the horizontal tracks, are an economy option for smaller, lighter doors with adequate sideroom; extension-spring systems shall include containment cables so that a broken spring cannot become a projectile.
+
+```datasheet
+label: Counterbalance Type
+type: radio
+options:
+ - "Torsion spring on header shaft (standard commercial)"
+ - "Extension springs with containment cables (light doors, adequate sideroom)"
+default: "Torsion spring on header shaft (standard commercial)"
+```
+
+## Spring Cycle Life
+
+Each cycle is one open-and-close. The spring shall be rated for at least the cycle life corresponding to the door's expected daily use over its service life. ANSI/DASMA 102 sets a 10,000-cycle minimum for residential and commercial door systems and requires the system to be designed for the specified life when more than 10,000 cycles are specified; cycle life is verified by the test method of ANSI/DASMA 109. Selecting the spring class to the actual duty — rather than accepting the base 10,000-cycle spring on a door that will cycle 50 times a day — is what prevents premature spring failure.
+
+```datasheet
+label: Spring Cycle-Life Rating
+type: radio
+options:
+ - "10,000 cycles — base / low-frequency use"
+ - "25,000 cycles — moderate commercial use"
+ - "50,000 cycles — frequent commercial / dock use"
+ - "100,000 cycles — high-cycle industrial / distribution"
+default: "25,000 cycles — moderate commercial use"
+```
+
+## Track and Lift Type
+
+The track and lift configuration shall be selected for the available headroom above the opening and sideroom at the jambs, which shall be verified against the as-built opening before fabrication. Standard lift — vertical track turning onto horizontal track near the ceiling — is the default and needs roughly 15 in. to 36 in. of headroom. High lift extends the vertical track so the door rises before turning horizontal, used where the ceiling is well above the opening. Vertical lift carries the door straight up with no horizontal track, needing headroom about equal to the door height, used where overhead space is reserved or the structure is tall. Low-headroom track uses a second horizontal track and special top brackets to operate in as little as about 9 in. of headroom. Follow-roof-pitch track angles the horizontal track to the roof slope and is used where the roof pitch exceeds about 3:12. The wrong track type discovered at installation is the most common field conflict on sectional doors; it shall be selected at the submittal stage from verified clearances.
+
+```datasheet
+label: Track / Lift Type
+type: select
+options:
+ - "Standard lift — ~15-36 in. headroom (default)"
+ - "High lift — ceiling well above opening"
+ - "Vertical lift — headroom ≈ door height, no horizontal track"
+ - "Low headroom — as little as ~9 in. headroom"
+ - "Follow-roof-pitch — sloped ceiling / roof pitch over 3:12"
+drawing_ref: true
+default: "Standard lift — ~15-36 in. headroom (default)"
+```
+
+## Wind-Load Reinforcement
+
+Where the design wind pressure requires it, the sections shall be reinforced with horizontal struts and, on wide openings, removable center posts or a wind-rated track and bracket package per the wind-load listing for the design pressure. Reinforcement shall be specific to the scheduled opening width; the strut schedule is part of the wind-load submittal.
+
+```datasheet
+label: Wind-Load Reinforcement
+type: radio
+options:
+ - "Not required at design pressure"
+ - "Struts / reinforcement per wind-load listing"
+ - "Struts plus removable center post(s) for wide openings"
+default: "Not required at design pressure"
+```
+
+# Weatherseals
+
+Exterior and conditioned-opening doors shall be furnished with the weatherseals needed to meet the specified air-infiltration limit: a flexible bottom astragal sealing the bottom section to the floor or sill, jamb weatherseals sealing the door edges against the jambs, a header seal at the top of the opening, and, on insulated doors, integral seals at the section joints. Seals shall be field-replaceable without removing the sections.
+
+```datasheet
+label: Weatherseal Package
+type: checkbox
+options:
+ - "Bottom astragal (floor/sill seal)"
+ - "Jamb weatherseals (vertical edge seals)"
+ - "Header seal (top of opening)"
+ - "Section-joint seals (insulated doors)"
+default: "Bottom astragal (floor/sill seal)"
+```
+
+# Hardware
+
+The hinges, rollers, brackets, track, fasteners, and cables shall be sized for the door weight, the design wind reaction, and the specified cycle life, and shall conform to ANSI/DASMA 102 component conventions. Rollers shall run on sealed or hardened bearings on high-cycle doors so the roller, not the track, takes the wear. On residential and light-commercial doors the section interfaces should be pinch-resistant in accordance with ANSI/DASMA 116 to reduce finger-entrapment between sections. Lift cables shall have the safety factor required by ANSI/DASMA 102 against the door weight.
+
+```datasheet
+label: Roller Type
+type: radio
+options:
+ - "Steel rollers, sealed bearings (standard commercial)"
+ - "Nylon-tired rollers (quiet operation / interior)"
+ - "Heavy-duty bearing rollers (high-cycle / industrial)"
+default: "Steel rollers, sealed bearings (standard commercial)"
+```
+
+```datasheet
+label: Locking
+type: radio
+options:
+ - "None (powered door with operator hold)"
+ - "Interior slide lock / step plate"
+ - "Cylinder lock, keyed exterior"
+drawing_ref: true
+default: "None (powered door with operator hold)"
+```
+
+# Operation and Operators
+
+## Operation Type
+
+The means of operation shall be selected for the door size, weight, frequency of use, and whether powered operation is functionally required. Manual push-up is suitable only for small, well-balanced doors. A manual chain hoist (hand chain through a reduction) is the default for larger manually operated doors. Motor operation is selected for high-frequency use, large or heavy doors, and remote or automated control. The operator mounting type — jackshaft on the torsion shaft, trolley on a ceiling rail, or hoist on the wall — shall suit the headroom, sideroom, and lift type, and shall be confirmed against the shop-drawing clearances.
+
+```datasheet
+label: Operation Type
+type: radio
+options:
+ - "Manual push-up (small, well-balanced doors)"
+ - "Manual chain hoist (hand chain and reduction)"
+ - "Motor operator — jackshaft (wall/shaft mount)"
+ - "Motor operator — trolley (ceiling rail)"
+ - "Motor operator — hoist (wall mount)"
+default: "Manual chain hoist (hand chain and reduction)"
+```
+
+## Operator Duty Class
+
+The operator shall be rated for the door's daily cycle count and weight; the operator duty class shall be coordinated with the spring cycle-life selection so that the whole system is matched to the service.
+
+```datasheet
+label: Operator Duty Class
+type: radio
+options:
+ - "Standard duty — up to ~10 cycles/hour"
+ - "Industrial / continuous duty — frequent or continuous cycling"
+default: "Standard duty — up to ~10 cycles/hour"
+```
+
+## Operator Horsepower
+
+```datasheet
+label: Operator Horsepower
+type: select
+unit: hp
+options:
+ - "1/2 hp — small to moderate doors"
+ - "3/4 hp — standard commercial"
+ - "1 hp — large or heavy doors"
+ - "1-1/2 hp and larger — industrial / high-wind reinforced doors"
+default: "3/4 hp — standard commercial"
+```
+
+## Operator Electrical and Enclosure
+
+The operator and control-station enclosures shall carry a NEMA rating appropriate to the location, in accordance with NEMA 250. A standard interior operator may be NEMA 1; an exterior, washdown, or dusty location requires a higher rating (NEMA 4 / 4X or NEMA 12). Operator voltage, phase, disconnect, and conduit shall be coordinated with the electrical drawings, and wiring shall comply with NFPA 70.
+
+```datasheet
+label: Operator / Control Enclosure Rating (NEMA 250)
+type: select
+options:
+ - "NEMA 1 — interior, dry"
+ - "NEMA 4 — exterior / washdown"
+ - "NEMA 4X — corrosive / coastal"
+ - "NEMA 12 — dusty / industrial interior"
+default: "NEMA 1 — interior, dry"
+```
+
+```datasheet
+label: Operator Power
+type: select
+options:
+ - "120V, 1-phase"
+ - "208-240V, 1-phase"
+ - "208-240V, 3-phase"
+ - "480V, 3-phase"
+drawing_ref: true
+default: "208-240V, 3-phase"
+```
+
+## Controls
+
+The control station shall provide open, close, and stop functions. A manual override (chain hoist or hand crank) shall be provided on powered doors so the door can be operated during a power failure.
+
+```datasheet
+label: Operator Control Type
+type: radio
+options:
+ - "Three-button (open / close / stop), constant-pressure close"
+ - "Three-button momentary with monitored entrapment protection"
+ - "Three-button with radio/remote and access-control interface"
+default: "Three-button momentary with monitored entrapment protection"
+```
+
+```datasheet
+label: Manual Override on Powered Doors
+type: radio
+options:
+ - "Chain hoist override (standard)"
+ - "Hand-crank / disconnect to manual"
+default: "Chain hoist override (standard)"
+```
+
+# Safety Devices
+
+## UL 325 Entrapment Protection
+
+Powered sectional doors shall comply with the edition of UL 325 in force. Under the current requirements, a powered door that closes automatically (momentary contact) shall be protected at the entrapment point by at least two independent means of entrapment protection, and every external entrapment-protection device shall be monitored by the operator for both proper operation and proper connection; on a monitored-device fault, the operator shall inhibit automatic closing. An inherent reversing system alone does not satisfy the two-means requirement, and a duplicate of the same device does not count as the second means. A constant-pressure (hold-to-close) station, where the door closes only while the operator holds the control and stops the instant the control is released, is an alternative permitted in lieu of automatic closing for certain commercial doors.
+
+The reason for the monitored, redundant requirement is that a sectional door closing on a person or vehicle can cause serious injury, and a single safety device that has failed silently gives a false sense of protection; monitoring forces the failure to be detected and stops automatic operation until it is repaired.
+
+```datasheet
+label: UL 325 Entrapment Protection Scheme
+type: radio
+options:
+ - "Inherent reversing system plus monitored photo-eye (external)"
+ - "Inherent reversing system plus monitored sensing edge (external)"
+ - "Constant-pressure (hold-to-close) station — no automatic close"
+default: "Inherent reversing system plus monitored photo-eye (external)"
+```
+
+```datasheet
+label: Additional Safety Devices
+type: checkbox
+options:
+ - "Photo-eye across opening near floor"
+ - "Reversing sensing edge on bottom section"
+ - "Audible/visual motion warning on close"
+ - "Vehicle-detector / loop interface"
+default: "Photo-eye across opening near floor"
+```
+
+# Finishes
+
+```datasheet
+label: Section / Exterior Finish
+type: radio
+options:
+ - "Mill galvanized (no topcoat) — interior, non-insulated"
+ - "Factory primer (field-finish by painting trade)"
+ - "Factory-applied baked polyester topcoat (standard)"
+ - "Two-coat factory paint system (coastal / corrosive)"
+ - "Anodized or factory paint (aluminum full-vision)"
+default: "Factory-applied baked polyester topcoat (standard)"
+```
+
+Where the section is factory-primed only, coordinate the topcoat with [[sync/exterior-painting]] or [[sync/interior-painting]] as applicable. Confirm color selection against the manufacturer's standard finish range before order.
+
+# Installation
+
+The opening shall be verified before installation begins: width, height, plumb of the jambs, level of the header and floor, and — critically — the available headroom above the header and the sideroom at each jamb against the track and lift type on the shop drawings. A sectional door cannot be installed in less than its required headroom and sideroom; where clearances are tight, the low-headroom or alternate lift configuration shall have been selected at the submittal stage, not discovered now.
+
+## Track and Jamb Attachment
+
+Vertical tracks shall be anchored to the jambs and the horizontal tracks supported from the structure above so that the track is plumb, level, and to the correct radius and backhang for the lift type. Track shall be set so that the rollers run freely without binding through the full travel. Anchorage shall develop the wind reaction and the counterbalance reaction; anchorage into hollow masonry or to studs without solid blocking shall not be substituted for the listed anchorage on a wind-rated door.
+
+## Counterbalance Installation and Tensioning
+
+The torsion shaft, bearing plates, drums, and cables shall be installed and the springs wound to the tension that balances the door so it stays put at any position and is moved with the specified effort. Spring winding shall be performed only by the trained installer with the correct winding bars; the energy stored in a torsion spring is hazardous. Cables shall be seated in the drum grooves without crossover and tensioned equally so the door rises level.
+
+## Operator Mounting
+
+The operator shall be mounted per the manufacturer's instructions and coupled to the shaft or trolley so that the limits and the manual disconnect function correctly. The operator and control station locations shall be confirmed against the available headroom and sideroom before rough-in. The control station shall be positioned within sight of the door and out of reach of the moving door, and any constant-pressure station within sight of the full door travel.
+
+## Sealing and Flashing to the Opening
+
+The frame of the door shall be sealed to the surrounding wall so the opening is continuous with the building's air and water barrier. Perimeter joints shall be sealed in accordance with [[sync/joint-sealants]], and the head and jamb conditions shall be flashed and tied to the wall air barrier in accordance with [[sync/air-barriers]]; on a conditioned envelope, an insulated door with a leaking perimeter defeats its own R-value. Where the door closes a conditioned space, coordinate the perimeter insulation and thermal continuity with [[sync/building-thermal-insulation]].
+
+# Field Quality Control
+
+## Operational Test
+
+Every sectional door shall be cycled through its full travel and adjusted so that it opens and closes smoothly, the rollers track without binding, the counterbalance holds the door at intermediate positions, the door rises level, and the bottom seal seats fully and evenly on the floor in the closed position. Powered doors shall be tested for correct open, close, stop, and reversing function and for manual override operation.
+
+## Safety-Reverse and Entrapment-Protection Test
+
+For each powered door, the entrapment-protection devices shall be functionally tested: obstructing the closing door at the reversing edge shall cause the door to stop and reverse, interrupting the photo-eye shall stop and reverse (or stop) the door per the listed behavior, and disconnecting or faulting a monitored external device shall inhibit automatic closing. The safety-reverse result shall be recorded for closeout.
+
+## Cycle Test
+
+Where a high-cycle or industrial door is specified, the installed door should be cycle-tested through a representative number of operations to confirm balance and operator function under repeated use before acceptance.
+
+```datasheet
+label: Required Field Tests
+type: checkbox
+options:
+ - "Operational cycle and counterbalance balance check (all doors)"
+ - "UL 325 entrapment-protection and safety-reverse test (powered doors)"
+ - "Representative cycle test (high-cycle / industrial doors)"
+default: "Operational cycle and counterbalance balance check (all doors)"
+```
+
+# Cleaning, Adjusting, and Protection
+
+After installation the Contractor shall clean the sections, glazing, and hardware of fingerprints, grease, and construction soil; touch up minor finish damage with the manufacturer's matching coating; and adjust the counterbalance, track, and operator limits for smooth, level, quiet operation. Lubrication points shall be serviced per the manufacturer's instructions. Installed doors shall be protected from damage by other trades until substantial completion; a door dented or its track bent during construction shall be repaired or replaced so that it operates and seals as specified.
+
+# Warranty
+
+The door manufacturer shall warrant the sectional door against defects in materials and workmanship for the period specified below from the date of substantial completion, and shall separately warrant the springs and the section finish where a longer term applies. The operator and its controls shall carry the operator manufacturer's warranty. Warranty service shall include the labor to adjust or replace warranted components.
+
+```datasheet
+label: Door Manufacturer Warranty Period
+type: radio
+options:
+ - "1 year"
+ - "2 years"
+ - "3 years"
+ - "5 years (sections and hardware)"
+default: "2 years"
+```
+
+```datasheet
+label: Spring / Cycle Warranty
+type: radio
+options:
+ - "Standard (matches door warranty)"
+ - "Extended spring warranty matched to specified cycle life"
+default: "Extended spring warranty matched to specified cycle life"
+```
+
+```datasheet
+label: Operator Warranty Period
+type: radio
+options:
+ - "1 year"
+ - "2 years"
+ - "5 years"
+default: "2 years"
+```
+
+# Spare Parts
+
+The Contractor shall deliver to the Owner the manufacturer's recommended spare parts for the doors furnished, so that the most wear-prone and operation-critical components can be replaced without procurement delay. Spare seals and rollers are inexpensive insurance against downtime on high-cycle dock doors; a spare operator control board and remote are warranted on automated openings.
+
+```datasheet
+label: Spare Parts to Furnish
+type: checkbox
+options:
+ - "Bottom astragal and jamb seal stock (one door set)"
+ - "Spare rollers and hinges (per high-cycle door)"
+ - "Spare lift cables (per door size)"
+ - "Operator control board / logic and remote (automated doors)"
+default: "Bottom astragal and jamb seal stock (one door set)"
+```