A.Jay Meunier, contracting specialist at S. T. Griswold and Co. in Williston, Vt., responds: Many house foundations will exhibit small hairline cracking from curing and shrinking. If the cracks do not enlarge much more than their present size, the foundation should be fine.

There are several possible causes of the cracks, including normal shrinkage from curing, and early backfilling of the foundation without bracing the walls. As concrete cures, it dehydrates and wants to shrink. Factors affecting whether cracks will appear on walls include the length of the walls, the number of wall penetrations, and the slump of...

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