Rigid foam over textured concrete basement wall?
I think the standard advice at GBA about insulating basement walls is to put rigid foam flush against the basement wall, and then install some sort of fire barrier, e.g. drywall. The key is to prevent moist air from contacting the cold basement walls and then condensing.
In our area, many houses have poured basement walls that apparently used concrete form liners to give a fake brick texture to the walls. If one were to use standard sheets of rigid foam, there would be a 3D network of air channels behind the foam. If the rigid insulation seams are taped well, are there any issues here, or would you just proceed the same as you would if the walls were flat?
Note: I have no interest in spray foam, except perhaps canned foam for sealing where tape won’t work.
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