Insulation basement.
1/17/2019 at 6:40:11 AM
Hello.
I have plan install in basement ridge foam 1 1/2" and then use fiberglass. My question, need use vapor barrier after fiberglass. If NO, can you explain why. I very worried about moisture inside between ridge foam and fiberglass.
Thank you.
1/17/2019 at 9:20:37 AM
Hi
Answer is no vapor barrier, reason unless things have changed a perm rating of less than 1 or 60ng is considered a sufficient vapor retarder as long as the foam is well sealed meaning no un-taped or foamed gaps and is continuous meaning framing after its on (1.5" is around 0.65 and 2" is 0.5 perms.
Moisture turns into water on a cold surface not in the insulation.
The system will let water vapor pass back and forth in the wall system and dry (change in were the due point is).
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