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Old 04-05-2013, 10:24 PM   #16
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Insulating basement walls

Originally Posted by bryanp22 View Post
I'm in milwaukee area. So you do 1.5 rigid and then rolled in the walls? Do I need to worry about moisture at all with the rolled insulation if I do the 1.5" of rigid foam?

R-7.5 (1-1/2" of XPS) and R-13 will give f.b. temp of 38*F and 31%RH. If relative humidity is above 31% in the basement at 70*F, it could condense there. You need to realize that if the drywall is completely air-sealed; electrical outlets, caulking, f.b. under the bottom plate with a bead of caulk, rim joists air-sealed, rigid f.b. glued with compatible adhesive in 1' grid squares, cavity insulation touching f.b.- no air gaps at all, you will be fine;
Basement vapor barrier;
Fire-stop every 10' per code.




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