We had a few hairline cracks which were sealed and spot-painted as part of our one-year builder warranty. I probably wouldn't have even noticed them if the inspector that we hired hadn't found them. The inspector told us that hairline cracks are "normal" (for lack of a better word)... but they do need to be sealed up as it is a way for moisture to enter the structure. Not a big deal, once you know what to look for and what to do.
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