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The factors that affect concrete slab thickness are climate, soil conditions and intended use. The slab thickness numbers in this article are guidelines from the IRC and Local cities, consult with your local building department and/or a structural engineer for your local recommended concrete slab thickness for your backyard shed floor, driveway, doorway landing pad or porch cap.
Recommended Thickness of Concrete Slabs
Shed Slabs: 3 1/2 inches thick. Shed floors that are being used for studio sheds or workshops will use a 3 1/2" thickness.
Garage slabs: 3 1/2 inches thick
Home Interior Slabs: 3 1/2 inches thick, (The 2009 International Residential Code 506.1, says 3 1/2" thick with #6 wire mesh in the top 1/3 of the concrete slab, 506.2.4 and a 6 mil plastic barrier under the slab, 506.2.3)
Driveways: 4 inches, some areas require 5 inches. Many garage sheds need a driveway approaching the large shed door. The 4 inch thickness helps with larger vehicles that may be driven up to or parked in front of the backyard shed.
Porch Caps: Spanning over a cold storage area, 6-8 inches thick with #4 rebar at 12" on center each way. This should be verified with a structural engineer because every porch span is different.
Porch Caps: On compacted soil, 4-5 inches
Sidewalks: 5 inches; this is required by many cities. Check with your local building department because even though you are paying for the concrete the city usually owns it.
Driveway Approaches: 6-8 inches, Check with your local building department.
Recommended Mix Of Cement In The Concrete
Concrete poured on the exterior: driveways, foundations, sidewalks etc., is usually 6 bag mix . = 6000 psi.
Concrete poured on the interior: garages, houses, basement floors etc., is usually 5 bag mix.= 5000 psi.