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A 4-inch-thick concrete slab can support around 4,000 pounds per square foot if a contractor reinforces the slab with rebar, while that same slab without reinforcements will support closer to 1,000 pounds. For the purposes of a patio, 4 inches in thickness without reinforcement should suffice unless you’re installing heavy kitchen equipment or a hot tub on it. In those cases, reinforcing your slab and sticking with 4 inches of thickness should provide plenty of strength.

In most cases, you will need a building permit for cement work on your property. You need a permit for any project that adds a permanent foundation on your property—which, in most cases, includes even a flat slab of concrete poured directly on the ground. Building permits for concrete projects usually cost between $100 and $500, although this can get higher for larger projects. You can always ask your cement company if a permit is necessary for your project, and the expert will typically pull the permit for you to save you time and energy.

New concrete can crack within 12 hours of finishing, as it can be a common occurrence as the concrete dries and cures. Certain weather conditions and temperatures can slow or speed up the cracking. A concrete contractor plans for cracking during the drying process and keeps some of it at bay by installing control joints.

Yes, spraying water on the surface helps concrete cure evenly by preventing the top layer from curing long before the wet bottom layer cures. Otherwise, the top layer will cure and shrink, creating tension, and this tension will tear the top and bottom layers apart, creating a weakened slab. Water prevents this from occurring.