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Concrete shrinkage cracks are very common and should be expected. Even professionals end up with shrinkage cracks on newly poured concrete slabs. Remember that these cracks are not harmful to the slab's strength, though some homeowners do prefer to fill in the cracks for aesthetics. When installing concrete, you can avoid ample concrete shrinkage cracks by avoiding hot, sunny, or windy days.

Yes, you can pour new concrete over old concrete, but you need to apply a concrete bonding agent to the existing concrete to ensure the new concrete sticks. Keep in mind that even with a bonding agent, large cracks and other flaws will still come through. If the concrete has heaved, settled, or cracked, pouring new concrete on top won’t address any root structural problems. Removing the existing concrete and rebuilding will be your best solution in that case.

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.

Spraying water on concrete will slow down the curing process and can help create a stronger slab. Spraying your concrete may be necessary if you’re pouring in hotter temperatures above 60 degrees Fahrenheit, if it’s particularly windy, or if your new concrete is exposed to intense sunlight. Avoid spraying for the first four hours, and then spray five to 10 times a day for the following week.