Steel Grating for Drainage
Steel grating for drainage covers the trenches, channels and pits that keep roads, yards and factory floors dry, including drainage applications in Singapore. Referred to in the trade as drainage channel grating, trench grating or steel trench cover, these panels sit over the water path and let runoff pass while stopping vehicles, people and debris from falling in.
The right drainage grating is chosen on two numbers: the traffic load it must carry and the open area it must pass. For projects in Singapore, material, bar spacing, frame type and other specifications should also be selected according to the site conditions and applicable Singapore Standards and project requirements.
Why Steel Grating for Drainage
- High flow capacity — the open structure passes large volumes of surface water without ponding.
- Vehicle-safe — panels are rated to EN 124 / EN 1433 load classes from pedestrian (A15) up to airport and port traffic (F900).
- Debris control — bars stop leaves, litter and solids from entering the channel while letting water through.
- Corrosion resistance — hot-dip galvanizing suits most sites; stainless handles coastal, chemical and food environments.
- Easy access — removable panels allow the channel to be cleaned and inspected whenever needed.
- Steel grating for road drainage
- Steel grating for tourist walkways
- Industrial drainage steel grating
Recommended Specification for Drainage Grating
| Item | Typical choice | Notes |
|---|---|---|
| Load class | A15–B125 pedestrian; C250 car parks; D400+ roads | Match the worst traffic on site |
| Material | Q235 steel, hot-dip galvanized; SS304/316 | Galvanized default; stainless in aggressive environments |
| Bearing bar | Flat bar 30×3 to 65×5 mm | Sized to load class and clear span |
| Bar spacing | 20–40 mm | Heel-proof (≤12 mm) in pedestrian zones |
| Surface | Serrated on ramps and wet walkways | Improves grip for pedestrians and tyres |
| Frame | Steel or concrete frame, lockable or bolt-down | Flush, level finish |
Configurations Worth Considering
- Heel-proof close mesh where the public walks — openings small enough that heels and pushchair wheels cannot drop through.
- Lockable or hinged covers in public and security-sensitive areas to stop theft or unauthorised removal.
- Recessed or flush-fit frames so covers sit level with the surrounding surface, removing trip hazards.
- Serrated surface on ramps, driveways and pedestrian crossings that stay wet.
The trench cover grating page covers trench and pit covers with frames, while steel grating for road drainage details road, highway and heavy-traffic applications.
Common Questions
How do I choose the load class for drainage grating?
Match it to the worst vehicle that will drive over it: A15/B125 for pedestrians and cycle paths, C250 for car parks, D400 for normal roads and E600/F900 for heavy industrial, ports and airport aprons.
Galvanized or stainless for drainage covers?
Hot-dip galvanized is the economical default for roads, car parks and industrial yards. Use stainless 304/316 near the coast, in chemical plants or food-processing drains where galvanizing would corrode quickly.
What bar spacing prevents accidents in pedestrian areas?
Openings should be 12 mm or less (heel-proof). For areas with only occasional pedestrians, 30–40 mm spacing is common but must be assessed for trip and drop-through risk.
Tell us the channel width, length, load class and quantity on the contact page — our engineers confirm the specification and return a factory-direct quote within 24 hours. Browse the galvanized steel grating and stainless steel grating ranges while you are here.
