Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Trench Drains and Floor Drains
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### 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}
+### 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.
```datasheet
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### 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
…5 unchanged lines
```
+### 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}
+
## 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
…5 unchanged lines
```
+### 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}
+
# Trench Drain Construction {toc}
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### 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
…9 unchanged lines
```
+### 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}
+
## Channel Width and Depth {toc}
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### 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
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```
+### 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}
+
### A minimum built-in or field-set slope shall be maintained toward the outlet so the channel self-drains.
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### 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
…9 unchanged lines
```
+### 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}
+
### 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
…7 unchanged lines
```
+### 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}
+
## Trench Sediment Bucket {toc}
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## 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)
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- One spare sediment bucket per drain type with a bucket
```
+
+### 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}