Moogy_C OP t1_je5x52t wrote on March 29, 2023 at 5:18 PM

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

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.

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

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.