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Old 08-09-11, 07:46 PM   #16
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Originally Posted by Daox View Post
Alternatively, I can get 1" polyiso with an R value of 6.5 for $60 for the whole wall. Great stuff would be an additional $20 maybe? If I wanted to double up the polyiso I could easily do that and still be at half the cost of the spray foam.
This is the technique I have been using in my house.

At first I was cutting the foam to be a tight fit, very, very time consuming. Finally I realized that if I left about .25" all around and used Great Stuff to fill these gaps, it was both faster and more effective. Care must be taken to keep the great stuff from getting behind the foam panels, as it will push the panels forward.

I'm not an HVAC technician. In fact, I'm barely even a hacker...
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