+---
+title: Trench Drains and Floor Drains
+category: Plumbing
+toc_depth: 3
+description: >
+ When to use: selecting and specifying trench drains (linear channel drains
+ with grates) and floor drains (point drains with strainers) for non-residential
+ interior and immediately adjacent exterior floors — commercial kitchens and
+ food-processing, parking structures and wash bays, mechanical and electrical
+ rooms, loading docks, industrial and process floors, and locker/shower rooms.
+ Covers channel bodies, grates, frames, outlets, traps, trap primers, sediment
+ buckets, and integral waterproofing flanges as assembled systems, including
+ load class, hydraulic sizing, ADA grate compliance, and fluid compatibility.
+ Not intended for: sanitary waste/vent piping downstream of the outlet
+ (sync/sanitary-waste-and-vent-piping); roof and overflow drainage
+ (sync/roof-drainage); gravity or hydromechanical grease interceptors in the
+ drainage line (sync/grease-interceptors); cleanouts, backwater valves, and
+ floor sinks beyond basic drain bodies (sync/plumbing-specialties); and
+ below-grade exterior perimeter or footing drainage (civil/waterproofing scope).
+---
+
+# Scope {toc}
+
+## This standard covers floor drains and trench drains as assembled systems — the drain body, frame, grate or strainer, outlet, trap and trap primer, sediment bucket, and any integral waterproofing flange — for non-residential interior floors and immediately adjacent exterior areas. {note}
+
+## A floor drain is a point drain: a round or square body set flush with the floor, fitted with a removable strainer or grate, that collects water at a single low point. A trench drain is a linear drain: a continuous channel, typically pre-sloped, fitted with a removable grate, that collects water along a line. {note}
+
+## The two device families share most selection logic — load class, grate compliance, material compatibility, outlet coordination, and trap protection — and are therefore specified together here. {note}
+
+## Drain bodies, channels, grates, and traps to the drain outlet are within scope. {note}
+
+## Sanitary waste and vent piping downstream of the drain outlet is not covered here; see [[sync/sanitary-waste-and-vent-piping]]. {note}
+
+## Roof drains, scuppers, and overflow inlets are not covered here; see [[sync/roof-drainage]]. {note}
+
+## Gravity and hydromechanical grease interceptors installed in the drainage line are not covered here; see [[sync/grease-interceptors]]. {note}
+
+## Cleanouts, backwater valves, and floor sinks beyond basic drain bodies are not covered here; see [[sync/plumbing-specialties]]. {note}
+
+## Below-grade exterior perimeter, footing, and foundation drainage (French drains, foundation drains) is civil and waterproofing scope and is not covered here. {note}
+
+# Referenced Standards {toc}
+
+## Equipment, materials, and installation shall comply with the latest adopted edition of each of the following unless a specific edition is cited.
+
+## Where the adopted plumbing code and a referenced product standard conflict, the more stringent requirement shall govern unless the Engineer of Record directs otherwise in writing.
+
+## As of the 2022 edition, floor drains and trench drains are covered by two separate harmonized ASME/CSA standards; the older combined ASME A112.6.3-2019 edition is still widely cited in practice but should be superseded in new specifications. {note}
+
+| Standard | Title |
+|----------|-------|
+| ASME A112.6.3 / CSA B79.3 | Floor Drains (2022; floor drains, adjustable floor drains, area drains) |
+| ASME A112.6.8 / CSA B79.8 | Trench Drains (2022; trench drains, utility channels, grate systems) |
+| ASME A112.3.1 | Stainless Steel Drainage Fittings for Above-Ground Sanitary Drainage and Vent Piping Systems |
+| ASME A112.21.1M | Floor Drains (legacy edition; superseded by A112.6.3 / CSA B79.3) |
+| NSF/ANSI 2 | Food Equipment |
+| ADA Standards for Accessible Design (2010) | Accessible Design — Section 302.3 Openings |
+| IPC | International Plumbing Code (Sections 411, 413, and 1002) |
+| UPC | Uniform Plumbing Code (Chapter 4, Fixtures and Fittings) |
+| EN 1433 (informative) | Drainage Channels for Vehicular and Pedestrian Areas — Load Classification (Classes A–F) |
+
+## The load-class letters (A through F) used throughout manufacturers' literature derive from the European EN 1433 framework and are not formally defined in the ASME/CSA standards; where a load class letter is specified, the corresponding wheel/axle load and test category shall be stated so the requirement is unambiguous to a domestic supplier. {note}
+
+# Submittals {toc}
+
+## Action Submittals {toc}
+
+### The Contractor shall submit the following action submittals for each floor drain and trench drain type before fabrication or ordering:
+
+- Product data for each drain type, including body material, outlet size and orientation, trap configuration, and grate or strainer
+- Manufacturer's load-class rating and the corresponding wheel or axle load for each trench drain and area drain
+- NSF/ANSI 2 listing documentation for every drain in a food-service splash or food-contact zone
+- Shop drawings showing channel runs, slope, invert elevations, outlet locations, and required slab depressions or blockouts
+- Grate selection showing slot width, bearing-bar orientation, and ADA compliance for drains in accessible routes
+- Trap primer type, connection point, and (for electronic primers) the required electrical circuit
+- Drain schedule keyed to the floor plans, listing tag, location, load class, body and grate material, and outlet size
+
+```datasheet
+label: Action submittals provided
+type: checkbox
+options:
+ - Product data (body, outlet, trap, grate/strainer)
+ - Load-class rating with wheel/axle load
+ - NSF/ANSI 2 listing for food-zone drains
+ - Shop drawings (runs, slope, inverts, outlets, depressions)
+ - Grate slot width and ADA-compliance documentation
+ - Trap primer type, connection, and electrical circuit
+ - Drain schedule keyed to floor plans
+```
+
+## Informational Submittals {toc}
+
+### The Contractor shall submit the following informational submittals:
+
+- Manufacturer's installation instructions, including formwork, encasement, and grate-protection requirements
+- Material compatibility statement for the channel body and grate against the expected drainage fluid chemistry and temperature
+- Manufacturer's certification that grates in vehicular areas meet the specified load class per the cited test method
+
+```datasheet
+label: Informational submittals provided
+type: checkbox
+options:
+ - Installation instructions (formwork, encasement, protection)
+ - Material/fluid compatibility statement
+ - Grate load-class certification
+```
+
+## Closeout Submittals {toc}
+
+### The Contractor shall submit the following closeout submittals:
+
+- Operation and maintenance data, including sediment-bucket cleaning intervals and grate-removal instructions
+- Warranty documentation for the drain assemblies
+- Record drawings showing as-installed invert elevations and outlet connections
+
+```datasheet
+label: Closeout submittals provided
+type: checkbox
+options:
+ - O&M data (sediment-bucket cleaning, grate removal)
+ - Warranty documentation
+ - Record drawings (as-installed inverts and outlets)
+```
+
+# Quality Assurance {toc}
+
+## Floor drains shall be listed to ASME A112.6.3 / CSA B79.3.
+
+## Trench drains shall be listed to ASME A112.6.8 / CSA B79.8.
+
+## Stainless steel drain bodies used in above-ground sanitary drainage shall comply with ASME A112.3.1.
+
+## Drains in food-service splash and food-contact zones shall be NSF/ANSI 2 listed as complete assemblies, including body, strainer, and grate.
+
+### NSF/ANSI 2 listing governs the entire drain assembly, not just the body material; a generic stainless body without an assembly listing will satisfy the plumbing code but fail a health-department inspection. {note}
+
+## Grates installed within an accessible route shall comply with ADA Standards Section 302.3.
+
+## The manufacturer shall be a single source for the channel, frame, grate, and outlet of each trench drain system so that load rating and fit are warranted as an assembly.
+
+### A common specification error on post-2022 projects is to cite ASME A112.6.3-2019 by edition year for both device families; that combined edition was split, so the old number is ambiguous for a trench drain. Cite A112.6.3 / CSA B79.3 for floor drains and A112.6.8 / CSA B79.8 for trench drains. {note}
+
+### Mixing a channel from one system with a grate and frame from another voids the assembly's load certification and frequently produces a rocking or proud grate; single-source the load-bearing components. {note}
+
+# Environmental and Service Conditions {toc}
+
+## The drainage fluid chemistry, temperature, and solids content shall be identified for each area before the channel body and grate materials are selected.
+
+### Polymer concrete degrades in sustained high-pH or high-solvent exposure; auto shops, laboratories, and process floors with solvent or acid discharge require chemical-resistant HDPE or stainless steel rather than polymer concrete. {note}
+
+### Continuous hot discharge (commercial dishwashing, sterilizers, process blowdown) can soften some polymer bodies and grate coatings; confirm the body and grate are rated for the peak fluid temperature. {note}
+
+## The peak discharge temperature for each drain area shall be identified.
+
+```datasheet
+label: Peak drainage fluid temperature
+type: range
+unit: °C
+min: 10
+max: 95
+step: 5
+default: 40
+```
+
+## The drainage fluid chemistry classification shall be selected for each area.
+
+```datasheet
+label: Drainage fluid chemistry
+type: select
+options:
+ - Clear water / stormwater
+ - Domestic wastewater (kitchen, washdown)
+ - Solvent or hydrocarbon exposure
+ - Acid or alkaline (low/high pH) process discharge
+ - Saltwater / brine / de-icing runoff
+default: Domestic wastewater (kitchen, washdown)
+```
+
+# Load Classification {toc}
+
+## The load class shall be specified for every trench drain and area drain on the drain schedule; a drain schedule that omits load class shall be considered incomplete.
+
+### Contractors default to the lightest available grate when load class is absent; in a parking garage or loading dock that omission leads to grate failure under forklift or fire-apparatus loads. State the load class explicitly. {note}
+
+### The EN 1433 load classes provide a common vocabulary used in US manufacturers' literature: Class A (pedestrian/cycle), Class B (light vehicular, passenger cars), Class C (slow-moving light commercial), Class D (delivery trucks and most roadways), Class E (heavy industrial), and Class F (airport/extreme axle loads). Because these classes are not defined in the ASME standards, the corresponding wheel or axle load is stated alongside the letter on this schedule. {note}
+
+## The load class for each drain area shall be selected.
+
+```datasheet
+label: Grate / drain load class
+type: select
+options:
+ - Class A — pedestrian only (≤ 1.5 tonne test load)
+ - Class B — light vehicular, passenger car (≤ 12.5 tonne)
+ - Class C — light commercial / slow traffic (≤ 25 tonne)
+ - Class D — delivery truck / roadway (≤ 40 tonne)
+ - Class E — heavy industrial / forklift (≤ 60 tonne)
+ - Class F — extreme axle load (≤ 90 tonne)
+default: Class B — light vehicular, passenger car (≤ 12.5 tonne)
+```
+
+## Trench drains subject to vehicular traffic shall use frames anchored to the surrounding slab to resist horizontal grate creep and rocking under load.
+
+## Grates in vehicular areas shall be locked or bolted to the frame to prevent dislodging under wheel impact.
+
+### An unlocked grate in a traffic lane becomes a projectile under a tire and a fall hazard once displaced; vehicular grates are mechanically secured, not gravity-set. {note}
+
+# Floor Drain Construction {toc}
+
+## Body Material {toc}
+
+### The floor drain body material shall be selected to match the load environment, corrosion exposure, and any food-code requirement.
+
+### Cast iron is the default body for general-purpose interior floor drains in mechanical rooms, toilet rooms, and similar areas where neither food service nor aggressive chemistry applies. {note}
+
+### Stainless steel (Type 304, or Type 316 in chloride or aggressive-chemistry environments) is required where an NSF/ANSI 2 listing, frequent washdown, or corrosion resistance governs. {note}
+
+```datasheet
+label: Floor drain body material
+type: select
+options:
+ - Cast iron, coated
+ - Stainless steel Type 304
+ - Stainless steel Type 316
+ - PVC / ABS (limited, non-traffic service only)
+default: Cast iron, coated
+```
+
+## Strainer / Grate {toc}
+
+### Each floor drain shall be furnished with a removable strainer or grate sized for the drain throat.
+
+### The strainer or grate material shall match the body material in food-service and corrosive environments to avoid galvanic incompatibility and to maintain the NSF listing.
+
+```datasheet
+label: Floor drain top / strainer material
+type: select
+options:
+ - Nickel-bronze
+ - Cast iron
+ - Stainless steel Type 304
+ - Stainless steel Type 316
+ - Ductile iron
+default: Nickel-bronze
+```
+
+### Floor drains within an accessible route shall be furnished with a grate whose openings are no wider than 13 mm (1/2 in) in the predominant direction of travel, per ADA Section 302.3.
+
+### Floor drains at exterior building entrances shall be furnished with a heel-proof grate whose openings are no wider than 6 mm (1/4 in).
+
+### Heel-proof grates (≤ 6 mm slot) always satisfy ADA, but not every ADA-compliant grate is heel-proof; where heels, canes, or small wheels are present, specify heel-proof explicitly rather than relying on the ADA dimension alone. {note}
+
+## Adjustable Top {toc}
+
+### Floor drains set in cast-in-place slabs shall be furnished with an adjustable top to accommodate construction tolerance and allow the grate to be set flush with the finished floor.
+
+### An adjustable (screw or telescoping) top lets the grate be brought to the finished-floor elevation after the slab is poured, absorbing the inevitable difference between the rough-in elevation and the final finish; a fixed top set proud or low is a trip hazard and a ponding point. {note}
+
+```datasheet
+label: Top adjustability
+type: select
+options:
+ - Adjustable (screw / telescoping)
+ - Fixed height
+default: Adjustable (screw / telescoping)
+```
+
+## Sediment Bucket {toc}
+
+### Floor drains in commercial kitchens, wash bays, and process areas shall be furnished with a removable sediment bucket to intercept solids before the sanitary system.
+
+### Sediment buckets are frequently dropped by value engineering because the plumbing code does not always mandate them; without a bucket, solids accumulate at the outlet and cause recurring blockages downstream. Specify the bucket explicitly where solids are expected. {note}
+
+```datasheet
+label: Sediment bucket required
+type: select
+options:
+ - 'Yes — removable sediment bucket'
+ - 'No'
+default: 'No'
+```
+
+# Trench Drain Construction {toc}
+
+## Channel Body Material {toc}
+
+### The trench drain channel body material shall be selected for the load class, fluid chemistry, and temperature of the area it serves.
+
+### Polymer concrete is the general-purpose channel for light-to-medium-duty interior and exterior runs with neutral-pH discharge; it offers a smooth bore and good abrasion resistance but degrades under sustained high pH or solvent exposure. {note}
+
+### Fiber-reinforced and heavy-duty polymer concrete channels carry Class D and Class E loads at loading docks and vehicle wash bays. {note}
+
+### HDPE channels resist a broad range of chemicals and are favored in corrosive environments and parking structures; they are typically supplied as pre-sloped modular sections. {note}
+
+### Stainless steel channels (Type 304, or Type 316 for chloride exposure) are required for commercial kitchen, food-processing, and process floors where an NSF/ANSI 2 listing and full washdown cleanability govern. {note}
+
+### Cast iron channels with integral traps suit mechanical and boiler rooms where high temperature and point-source discharge are present. {note}
+
+```datasheet
+label: Trench channel body material
+type: select
+options:
+ - Polymer concrete
+ - Fiber-reinforced / heavy-duty polymer concrete
+ - HDPE
+ - Stainless steel Type 304
+ - Stainless steel Type 316
+ - Cast iron
+default: Polymer concrete
+```
+
+## Channel Width and Depth {toc}
+
+### The channel width shall be sized from the peak flow rate the run must convey, not chosen by default.
+
+### The peak flow a trench run must carry is a function of the catchment area it drains, the surface slope feeding it, and the discharge source (washdown hoses, process equipment, vehicle drip, or rainfall on an adjacent exterior apron). Width is selected so the channel conveys that peak flow at the design slope without surcharging over the grate; an undersized channel overtops and floods the floor regardless of how many outlets it has. {note}
+
+### Channel width and grate width are not the same selection — a wide architectural grate can sit over a narrower hydraulic channel. Size the channel bore to the flow and select the grate width for the load class and the opening the floor finish requires. {note}
+
+### The clear channel width shall be specified for each run.
+
+```datasheet
+label: Trench channel clear width
+type: select
+options:
+ - 100 mm (4 in)
+ - 150 mm (6 in)
+ - 200 mm (8 in)
+ - 300 mm (12 in)
+default: 100 mm (4 in)
+```
+
+### The channel depth and any required slab depression shall be coordinated with the structural slab; the slab blockout or depression dimension shall appear on the structural drawings. The depression extent and depth are shown at [[drawing: channel slab depression]].
+
+### The slab depression depth needed to receive a trench drain is frequently absent from the structural documents and surfaces as an RFI during formwork; carry the channel depth and required depression onto the structural drawings before the slab is formed. {note}
+
+## Slope Method {toc}
+
+### The channel slope method (factory pre-sloped modular or field-sloped continuous) shall be specified.
+
+### Pre-sloped modular channels arrive with the invert slope built in, which improves accuracy and reduces field labor, but they come in fixed length increments; a run that does not fit standard module lengths needs a custom end piece or a site-sloped continuous channel. Confirm the run length against the module catalog before specifying pre-sloped. {note}
+
+```datasheet
+label: Channel slope method
+type: select
+options:
+ - Factory pre-sloped (modular)
+ - Field-sloped (continuous, neutral channel)
+default: Factory pre-sloped (modular)
+```
+
+### A minimum built-in or field-set slope shall be maintained toward the outlet so the channel self-drains.
+
+```datasheet
+label: Minimum channel slope to outlet
+type: range
+unit: '%'
+min: 0.5
+max: 1.5
+step: 0.1
+default: 0.6
+```
+
+## Trench Grate {toc}
+
+### Each trench drain shall be furnished with a removable grate rated for the specified load class and secured to the frame as required for the traffic category.
+
+### The grate material shall be selected for the load class, corrosion environment, and any NSF requirement.
+
+### Ductile iron grates carry the highest vehicular loads and are the default for Class D and above. Stainless steel grates are required in food-service and corrosive areas. Galvanized steel and polymer grates suit lighter-duty and non-traffic runs. {note}
+
+```datasheet
+label: Trench grate material
+type: select
+options:
+ - Ductile iron
+ - Cast iron
+ - Galvanized steel
+ - Stainless steel Type 304
+ - Stainless steel Type 316
+ - Polymer / composite
+default: Ductile iron
+```
+
+### Trench grates within an accessible route shall present openings no wider than 13 mm (1/2 in) measured perpendicular to the dominant direction of travel, per ADA Section 302.3.
+
+### A parallel-bar grate satisfies ADA only when the bars run perpendicular to travel; installed with the slots running along the path of travel, the same grate fails ADA. Specify the bearing-bar orientation relative to travel, not just the slot width. {note}
+
+```datasheet
+label: Trench grate pattern / ADA compliance
+type: select
+options:
+ - Heel-proof slot (≤ 6 mm, ADA-compliant)
+ - ADA-compliant slot (≤ 13 mm perpendicular to travel)
+ - Slotted (non-accessible area)
+ - Open bar / mesh (non-accessible area)
+default: ADA-compliant slot (≤ 13 mm perpendicular to travel)
+```
+
+## Trench Sediment Bucket {toc}
+
+### Trench drains serving wash bays, commercial kitchens, and process floors shall be furnished with a sediment bucket or sump at the outlet to intercept solids.
+
+```datasheet
+label: Trench sediment bucket / sump required
+type: select
+options:
+ - 'Yes — sediment bucket at outlet'
+ - 'No'
+default: 'Yes — sediment bucket at outlet'
+```
+
+# Outlets {toc}
+
+## The outlet size, orientation, and invert elevation of each drain shall be coordinated with the sanitary piping system and shown on the plumbing drawings.
+
+### A mismatch between the factory-set outlet elevation and the field-installed sanitary invert is a leading RFI source; confirm the outlet invert on the plumbing plan against the structural slab depression before the drain is set. {note}
+
+## The outlet orientation shall be selected for each drain.
+
+```datasheet
+label: Outlet orientation
+type: select
+options:
+ - Bottom outlet
+ - End outlet
+ - Side outlet
+default: Bottom outlet
+```
+
+## The outlet diameter shall be selected to match the connecting sanitary branch.
+
+```datasheet
+label: Outlet nominal diameter
+type: select
+options:
+ - 75 mm (3 in)
+ - 100 mm (4 in)
+ - 150 mm (6 in)
+default: 100 mm (4 in)
+```
+
+## Long trench runs with high peak flow shall be provided with multiple outlets where a single outlet cannot convey the design flow; the number and location of outlets are shown at [[drawing: trench outlet locations]].
+
+# Traps and Trap Primers {toc}
+
+## Every floor drain and trench drain connected to the sanitary system shall be trap-protected, either by an integral trap or by a remote trap in the branch.
+
+## The trap type for each drain shall be selected.
+
+```datasheet
+label: Trap configuration
+type: select
+options:
+ - Integral P-trap (cast into drain body)
+ - Remote P-trap in branch
+default: Remote P-trap in branch
+```
+
+## Floor drains and trench drains that are used infrequently shall be furnished with a trap primer to maintain the trap seal, per IPC Section 1002.
+
+### An infrequently used drain loses its trap seal to evaporation, opening a path for sewer gas into the occupied space; the trap primer replenishes the seal automatically. This requirement is commonly omitted where the plumbing and mechanical drawings are not cross-coordinated. {note}
+
+## The trap primer type shall be selected.
+
+```datasheet
+label: Trap primer type
+type: select
+options:
+ - Automatic pressure-differential (plumbing-fed)
+ - Electronic / timed (requires 120 V circuit)
+ - Manual
+default: Automatic pressure-differential (plumbing-fed)
+```
+
+### Where an electronic trap primer is specified, the required 120 V circuit shall be coordinated with the electrical drawings.
+
+### Electronic primers need a dedicated circuit that is routinely forgotten on the electrical documents; coordinate the primer power with the plumbing engineer and confirm it appears on the electrical drawings before rough-in. {note}
+
+# Waterproofing Integration {toc}
+
+## Floor drains and trench drains that penetrate a waterproofed slab shall be furnished with a clamping-ring (membrane-clamp) assembly that seals the waterproofing membrane to the drain body.
+
+### A drain through a waterproofed parking deck, plaza, or kitchen slab over occupied space is a deliberate hole in the waterproofing; the clamping ring captures and seals the membrane to the drain so water cannot bypass the drain at the penetration. Omitting it creates a major leak path discovered only after the floor finish is in place. {note}
+
+## The clamping-ring assembly shall be compatible with the specified waterproofing membrane type; coordinate with [[sync/fluid-applied-waterproofing]] and [[sync/below-grade-waterproofing]] for membrane termination at the drain.
+
+## A clamping-ring (membrane-clamp) drain shall be specified for each drain that penetrates a waterproofed slab.
+
+```datasheet
+label: Waterproofing clamping ring required
+type: select
+options:
+ - 'Yes — membrane clamp / flashing flange'
+ - 'No — non-waterproofed slab'
+default: 'No — non-waterproofed slab'
+```
+
+## Drains set in resinous or seamless floors shall be detailed so the floor finish terminates into the drain flange; coordinate the drain top and flange with [[sync/resinous-flooring]].
+
+### A resinous floor needs a positive edge to key into at the drain — typically a recessed flange or a flashing clamp that the coating wraps into and that is then keyed back. Without that detail the coating feathers to a thin, unsupported edge at the grate and chips away, opening a path for water under the floor. {note}
+
+### Food-service drains in splash and food-contact zones shall present radius-coved interior corners and no exposed threads in the food zone, consistent with the NSF/ANSI 2 listing.
+
+### Square interior corners and exposed threads trap food soil and resist cleaning, which is why the NSF listing calls for coved radii and concealed fasteners in the food zone; verify the listed assembly provides them rather than assuming a stainless body alone qualifies. {note}
+
+# Testing {toc}
+
+## Each drain assembly and its branch shall be tested for leaks as part of the sanitary system test before the floor finish is placed.
+
+## Each trench run shall be water-tested for slope by flooding the channel and confirming it self-drains to the outlet with no standing water.
+
+### A flood test on the bare channel before the finished floor goes down catches a flat or reverse-sloped section while it can still be corrected; once the surrounding floor is poured, a low spot is permanent. {note}
+
+## Grate fit shall be verified so each grate seats flush with the finished floor and does not rock under load.
+
+```datasheet
+label: Field tests performed
+type: checkbox
+options:
+ - Drain and branch leak test
+ - Trench slope flood test (self-drains, no ponding)
+ - Grate flush-seat and rock check
+```
+
+# Installation {toc}
+
+## Drains and channels shall be installed per the manufacturer's instructions and at the inverts shown on the coordinated plumbing and structural drawings.
+
+## Trench channels shall be fully encased and supported per the manufacturer's instructions during the concrete pour so the channel does not float, deflect, or shift out of line.
+
+### A trench channel that floats or twists during the pour locks in a misaligned grate line and a compromised slope; channels are staked, braced, and often filled or strapped before concrete placement. {note}
+
+## Grates shall be installed or covered to protect them from the concrete pour and subsequent trade damage, and the channel bore shall be kept clear of concrete and debris.
+
+## Floor drain bodies shall be set so the adjustable top can bring the grate flush to the finished-floor elevation after the slab is poured.
+
+## Drains shall be set at the low point of the floor's drainage slope so the surrounding floor pitches toward the drain.
+
+### A drain set above the local low point leaves a ring of standing water around it; the floor finish must pitch to the drain, and the drain must sit at the true low point of that pitch. {note}
+
+# Delivery, Storage, and Handling {toc}
+
+## Drains, channels, and grates shall be delivered in the manufacturer's packaging and stored off the ground and protected from damage until installation.
+
+## Grates and strainers shall be kept with their matching bodies and channels so load-rated and NSF-listed assemblies are not mixed during installation.
+
+## Stainless steel components shall be protected from contact with carbon steel and from chloride-bearing dust to prevent surface rusting and pitting before the floor is closed in.
+
+# Warranty {toc}
+
+## The manufacturer shall warrant the drain and channel assemblies against defects in materials and workmanship for the period specified below.
+
+```datasheet
+label: Manufacturer warranty period
+type: range
+unit: years
+min: 1
+max: 5
+step: 1
+default: 1
+```
+
+# Spare Parts {toc}
+
+## The Contractor shall furnish spare grates, strainers, and sediment buckets as specified below for maintenance replacement.
+
+### Spare grates matter most where the installed grate is a long-lead or custom item (heavy load class, stainless food-service, or a non-standard width); a damaged grate in a traffic lane is a hazard that should be replaceable from stock rather than re-ordered. {note}
+
+```datasheet
+label: Spare grates / strainers furnished (% of installed quantity)
+type: range
+unit: '%'
+min: 0
+max: 10
+step: 1
+default: 2
+```
+
+```datasheet
+label: Spare sediment buckets furnished
+type: checkbox
+options:
+ - One spare sediment bucket per drain type with a bucket
+```
+
+### --- {note}
+
+### Copyright SynC. Licensed CC BY-SA 4.0. Independently authored from public consensus standards, model plumbing codes, and manufacturers' published technical data; contains no proprietary guide-specification text. {note}