Slab Thickness vs Load Class
Use this to sanity-check slab thickness by expected load class, then refine using the calculators and application guides.
| Load class | Typical thickness (in) | Typical use |
|---|---|---|
| Light | 4.0–4.5 | Foot traffic, light storage, patios, sidewalks. |
| Medium | 4.5–6.0 | Cars/SUVs, garages, light driveways, moderate rolling loads. |
| Heavy | 6.0–8.0+ | Pickups, RVs, shops, forklifts, industrial yards; often engineered. |
| For heavy equipment, poor soils, or structural slabs, use engineered design. | ||