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Minor Hairline Cracks appeared in the Concrete Slab.

We were warned in advance by several contractors that hairline cracks could appear on the concrete slab and were not preventable. The causes of the

hairline cracks could be the contraction of the concrete as it dries in the concrete curing process, the weight of the interior posts on the concrete slab

(again) or settling of the concrete slab. The Photograph below is of a hairline crack that appeared on the surface of the colored concrete slab.