The minimum depth of the joint should be 1/4 the thickness of the slab.
How thick should an asphalt driveway be?
In many cases a 4-inch thickness may be adequate, but 5 or even 6 inches of full-depth asphalt will assure you of a stronger, stable driveway under a wider range of climate and loads. As an option, some contractors use 6 to 8 inches of compacted aggregate, or gravel, as a base for 3 inches of asphalt pavement.
How thick does concrete need to be to not crack?
The joints should be of the depth of the slab and no more than 2-3 times (in feet) of the thickness of the concrete (in inches). So 4″concrete should have joints 8-12′ apart.
How thick should a concrete garage floor be?
The standard concrete garage floor is six inches thick and, with use of proper control joints, should be thick enough to withstand normal use.