Risk of Mold in Basement with Dimple Mat and Spray Foam
This question has probably been asked a bunch on here, but I’m coming up short with my searches. Here’s the summary, and see attached drawing: Our partially submerged, very old basement in Chicago (zone 5) will be furred out with studs and drywall, have new windows installed, and will be insulated with closed cell spray foam to approximately R-20. The basement will remain unfinished; we’re just trying to clean it up and regulate temperature. We installed an interior perimeter drain tile and sump, and the system works great. The foundation has a few vertical cracks typical of a house of this age, some of which are known to let a trickle of water in occasionally during huge storms. Micro seepage cracks are present in some areas. We plan to epoxy fill all the main cracks and install a dimple mat at the below-grade walls prior to insulating. My question is this: Is there any concern about mold growth behind the dimple mat after everything is in place? It seems like the right thing to do, rather than rely on the foam to seal micro cracks or pores.
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