Attic Knee wall insulation air sealing

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Attic insulation air sealing
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Umm, you have kraft faced fiberglass insulation against the interior wall. In this case the vapor barrier(kraft paper) is as it should be; facing the heat source. But when you add foam based insulation to the outside of the insulation, you're probably adding another vapor barrier. This is known as a vapor barrier sandwich and any moisture that gets in the wall can't easily get out, leading to declining performance of the fiberglass and mold/mildew problems. Not all foamboard is a vapor barrier, in particular in thinner sheets. Polyiso is a vapor retarder in most typical selections. But 2" of XPS is a vapor barrier by contrast. I'd suggest you check the ratings of your foamboard which is usually printed on the board. If your thickness/foam type is a vapor retarder, you might be OK. If it's a vapor barrier you'll have wall problems, all the more so since you thoroughly foamed the seams. The foil placing towards the interior wall further prevents moisture transmission. One other issue is leaving foamboard exposed. That's against all US building codes as it will aggressively burn with toxic fumes. This will shorten the time you and your family have to escape. You might think I'll take the chance, but if your house burns the insurance company could deny payment because you violated building code. And if people are hurt there are other problems with law enforcement. And this video is further proof! In this scenario I have had good luck using rockwool comfortboard as a secondary layer. It's essentially fireproof, allows moisture movement and is a great sound barrier. Good luck.

BobPritchard
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How has this performed since installing? Looking to do something similar to a few knee walls

blakeworsham
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I would love to install rockwool comfortboard on my knee wall but I got a devils triangle (osb wall, fiberglass batts in floor, rafters)and can not get there. Any ideas?

MichaelKeklak
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looks wrong based on all the other videos i've seen Good luck with moisture.

joec