Reply by dhazelton

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Posted on Insulating detached garage shop

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2839 posts in 3373 days

#1 posted 07-17-2019 02:25 PM

Everyone is saying spray foam. I agree but just want you to be sure to use CLOSED CELL spray foam. It’s impermeable to moisture and a couple inches of that is an effective air barrier – more than a couple of inches is just a waste of money. You don’t need venting because now your roof deck won’t have warm moist air coming into contact with it in the winter so rot is not an issue. If you go that route you may want to install a couple of ceiling fans to keep the warm or cool air down low where you want it.

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