What a load class means
A load class groups grating by the type of loading it is designed for—foot traffic, light vehicles, or heavy vehicles. It is a starting point for selection, not the whole answer.
Matching class to location
| Location | Typical duty | What to check |
|---|---|---|
| Footpaths, plazas | Pedestrian | Heel-proof opening, slip resistance |
| Car parks, light yards | Car and light van | Wheel loads, fixing security |
| Industrial yards | Forklift and truck | Concentrated wheel loads |
| Roads, docks | Heavy vehicle | Heavy rating, anti-displacement fixing |
Wheel load versus distributed load
- A wheel puts its load into a small contact area—this is a concentrated load.
- Crowds or stored goods spread load out—this is a distributed load.
- A grate fine for distributed load can still fail under a forklift wheel.
- Always state which kind of loading applies.
Why class alone is not enough
- The span and the seating still control the real capacity.
- Poor support reduces capacity regardless of the class.
- Cut-outs and holes remove load path.
- Confirm the class together with span, support and wheel loads.
How to specify it
- Name the location and the traffic that will cross the grate.
- State any standard or class the project requires.
- Give the clear span and the support detail.
- Confirm whether wheel loads apply, and their magnitude if known.
Load Classes FAQ
Can I use a pedestrian grate where cars pass?
No. Vehicle areas need a grate rated for wheel loads.
Is a heavier class always safer?
It is safer for load, but it costs more and may be needlessly heavy to lift.
Do I need to state the standard?
Yes, if the project specifies one; otherwise describe the traffic and the span.
