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georgenhofer t1_je5xl5c wrote on March 29, 2023 at 5:20 PM

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

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.