Perm value of 8 inches of open cell foam
How do you calculate the perm value for a given thickness of open cell foam?
I found Open Cell spray foam has a "perm ratings of approximately 16 per 3 inches thickness (up to 30-35 perms at one inch)"
What would be the perm value for 8 inches? I'm trying to find out if 8 inches of open cell foam would be better then 3 inches of closed cell foam for a vapor retarder.
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