Quote:
Originally Posted by Fuzz
Do you have room for R40? You can just stack 2 layers of R20 if you want to use batts. I was surprised that my R40 was just 2 R20's lightly glued together.
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If you do that, cross the direction of the layers of batts so you don't have seams lining up where you'd get gaps over time. Also helps lock everything together.