Placing Concrete at the Proper Thickness
Place concrete at a minimum thickness of 4 inches Thickness is the major factor (even more than the strength of the concrete) in determining a driveway's structural capacity. Increasing the thickness from 4 inches to 5 inches will add approximately 20% to your concrete cost, but will also boost your driveway's load-carrying capacity nearly 50% , according to the Tennessee Concrete Association. Also consider thickening the edges of the driveway by 1 or 2 inches to provide additional structural support in the area most likely to be subject to heavy loading, with the thickened section extending in from the slab edge 4 to 8 inches.
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