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georgenhofer t1_je5wpbg wrote

Reply to comment by Moogy_C in Surely this is mold. But on a bleached open concrete area? by Moogy_C

There is moisture underneath where that spot is showing.

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Moogy_C OP t1_je5x52t wrote

So you're saying ventilation would not help if that's the case? We haven't had a problem here in almost 10 years living here.

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georgenhofer t1_je5xl5c wrote

Ventilation would help, but there likely has been a lot of rain recently then, and runoff is going under your concrete pad. Likely the reason for the crack too, when freezing underneath.

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