Concrete Thickness Guide: How Thick Should Your Slab Be?
Patios, walkways, driveways, garage floors, shop floors — exactly how thick each application should be.
Thickness is the single biggest cost lever in any concrete project. Here's the right number for every common use.
Walkways and small patios — 4 inches
Foot traffic only. 4 inches is plenty over a properly compacted 4-inch gravel base.
Driveways — 4 to 6 inches
4" for passenger cars on stable soil. 5–6" if you'll park trucks, RVs, or trailers.
Garage floors — 4 inches residential, 6 inches shop
Standard residential garages do fine with 4". Detached shops with lifts or heavy equipment need 6" with rebar.
Heavy equipment pads — 8 inches+
Generators, large HVAC units, agricultural equipment. Always engineered.
Adjust thickness and watch your yards (and budget) change in real time.
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