“Even with the best floor designs and proper construction, it is unrealistic to expect crack-free and curl-free floors. The American Concrete Institute addresses this issue in ACI 302.1-04. However, sometimes cracks happen in spite of any precautions taken. This is done by properly preparing the subbase, assuring that the concrete is not too wet, utilizing reinforcement where needed, and by properly placing and spacing crack control joints and expansion joints. The best that a contractor can do is to try to control the cracking. When an owner sees a crack in his slab or wall, especially if the concrete is relatively new, he automatically assumes there’s something wrong. Cracks in concrete are extremely common but often misunderstood.
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