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Old June 29, 2017   #27
Worth1
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Join Date: Feb 2006
Location: Den of Drunken Fools
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Quote:
Originally Posted by clkeiper View Post
Worth, I asked Kevin he said he thought it was r20. not positive though.
Thanks.
If a person used 4 inches worth of high density foam board it would be R20.
Every inch has an R factor of 5 with this stuff and it doesn't break down.
Another thing to do is put that silver stuff pointing towards the outside.
The stuff is around 40 dollars for a 4X8X2 sheet.

Worth
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