Insulation for shop in zone 6
I have a shop in Zone 6 with 2×6 walls covered with OSB and then metal siding (no building wrap that I can see or tell).
I want to insulate the walls. I am looking at different options. The shop will not be heated full time so I don’t want to spend a fortune but when in it want it comfortable.
I am looking at just 2″ of closed cell foam by itself. (The garage in our new house has 2″ in the wall and 6″ in the roof and is working well.)
I think I can do 2″ of closed cell foam and then R13 batts which should be correct for the proper ratio of foam/fiberglass for moisture control but this would be expensive for a shop.
I am more interested in just using R19 batts. Will they work if I place a vapor barrier on the inside of the OSB and then place the batts on top of that?
Which of these would work for moisture control? The batts would be the cheapest.
The attic is unvented so my plan there is just 4″ of closed cell foam sprayed on the bottom of the roof decking. Then later I will add a drywall on the ceiling and walls
GBA Detail Library
A collection of one thousand construction details organized by climate and house part