For yards, patios, and pool decks, a Class A grate is plenty. The moment a car crosses it — a driveway apron or garage entry — step up to Class B so the grate never deflects under a wheel.

Parking lots and plazas live at Class B. Add Class C where box trucks, fire lanes, or delivery bays put heavier wheels over the channel. Cast iron handles the repeat traffic without warping.

Warehouses and loading docks need Class D as a floor; ports and heavy-haul yards move to Class E. Specify ductile/cast iron frames with proper concrete anchoring so the channel survives forklift edge-loading.

Here the load class follows the traffic, but the material decision is what protects you: stainless steel for sanitary wash-down, breweries, and kitchens, with anti-slip grates and slope built for hygiene and quick drying.

Aprons, taxiways, and container yards require Class F ductile iron with reinforced anchoring. These are engineered runs — we size the channel to the storm event and the frame to the wheel load, then quote the full schedule.

Walkways, parks, and pool decks stay at Class A, but the grate pattern is the real spec: ADA-compliant slot widths that are heel-proof, bike-safe, and anti-slip so no one catches a wheel or a heel.