Slab Thickness by Application
Typical slab thickness starting points for common slabs-on-grade. Use this table as a quick reference, then confirm with your conditions.
| Application | Typical thickness (in) | Notes |
|---|---|---|
| Patio / Walkway | 4.0 | Light foot traffic; control joints and good base matter. |
| Sidewalk | 4.0 | Typical municipal minimum; thicken edges if needed. |
| Shed / Light Storage | 4.0 | Increase thickness if equipment or point loads are expected. |
| Garage | 4.5 | Often 4–5"; reinforce at door openings/edges as needed. |
| Driveway (Cars) | 4.5–5.0 | Use a compacted base; consider 6" for heavier vehicles. |
| Driveway (Pickups/Heavier) | 6.0 | Heavier vehicles and turning loads justify more thickness. |
| RV Pad | 6.0 | Point loads from jacks; consider thickened areas. |
| Shop / Workshop | 6.0 | Better resistance to rolling loads; often includes reinforcement. |
| Warehouse (Light) | 6.0 | Forklifts/rolling loads; joints and flatness matter. |
| Industrial Yard | 8.0 | Often engineered; base and drainage critical. |
| Equipment Pad | 8.0 | Often engineered with thickened sections and rebar detailing. |
| Reference guidance for slabs-on-grade. Local codes, soils, joints, base, and loads can change requirements. | ||
Best practice: Thickness alone won’t prevent cracks. Control joints, a well-compacted base, proper drainage, and curing are often the deciding factors.