What PSI concrete is used for garage slabs?
4000 PSI is common for garage slabs because vehicles, point loads, and freeze-thaw exposure demand more strength than light patios.
Concrete cost guide
Concrete Garage Slab Cost
Garage slabs often need stronger concrete, thickened edges, vapor barrier, reinforcement, and careful finishing. Use this guide for a realistic slab budget.
Need project-specific numbers? Use the Concrete Garage Slab Cost Calculator.
Typical Cost Ranges
| Item | Typical Cost | Notes |
|---|---|---|
| Single-car garage slab | $2,800-$7,000 | About 240-400 sq ft |
| Two-car garage slab | $4,500-$11,000 | About 480-720 sq ft |
| Thickened edge upgrade | $5-$15/linear ft | Depends on depth and reinforcement |
How To Estimate It
- Slab concrete = length x width x thickness / 27
- Edge concrete = perimeter x edge area / 27
FAQs
Does a garage slab need a vapor barrier?
A vapor barrier is commonly used below garage slabs to control moisture, especially where flooring or storage will be affected.