Low expansion foam or airtight tape for windows?
Hi all. One more air sealing question. Is there a preference here between using low expansion foam to seal the gap between a window frame and rough opening vs. tape? I’ve heard both methods referenced here. Should I consider doing both, or is foam alone sufficient?
This is a retrofit full frame replacement, with most drywall and siding left in place. Since we are eliminating the 2″ window weight pocket, I have asked to reduce the 6″ metal trim on the outside to a smaller size to allow for more glass in the opening. I’m also cutting back drywall to the rough opening to get the windows as close to rough opening size as possible.
Is low expansion foam the best way to get the new windows airtight, or is there a better method such as high performance tape or a combination of the two? Builder is only familiar with the foam method, but I want to make sure my .13 U value windows don’t leak air at the frames.
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