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Good reminder about the poly facing. There didn't seem to be any facing on these Dow XPS boards. In case anyone's tracking prices, I paid $20/board for a big stack of 1.5"x4'x8' boards. One more materials question: I'm not confident that any of seam tapes I've read about are long-lasting or...

The internet is so great the for entire sport of DIY home remodelling. Anyway, no sealer on the walls, again because I want to let it keep breathing. Regarding air gaps, absolutely understand. Got plenty of cans of spray foam ready to go. On the other hand, for the floors, I don't really...

Thanks for the response, and especially the temperatre analysis. I do have extensive downspout revisions, and an interior footing drain with sump. So although there's no such thing as a guarantee, all the usual sources of liquid moisture are cured. The efflorence comment just goes to how damp...

Follow up to wall discussion This has been a fantastic thread for me as well, since my basement project is very similar to pmayer's. But I have an additional concern I haven't heard the answer to. I have a 1938 1-story w/ unfinished basement in Seattle. I too am planning to use XPS against...