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Insulating a hole in the wall
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12-18-2008, 01:04 PM
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NeilBlanchard
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Hello,
Trapped air is how you gain R-value. I would try 2 layers of 6 mil plastic, each taped tightly to all surfaces, and if possible, with a 1/2-3/4" of space between them. Calulk the gaps around the frame first.
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