Insulating a garage (converting it to a workshop / studio)
I’m in zone 6A and am converting a 22′ x 22′ garage into a studio and would like advice about best ways to insulate it. Currently the 2 x 4 walls have R-11 fiberglass in them, as does the ceiling. I plan to put in a plywood floor with rigid foam beneath it (over the slab). But I’m not sure what the best (and most cost effective) approach to the rest would be. Currently there’s no drywall, just the bare insulation.
Could I leave the batts and put rigid foam over them?
Should I remove the batts and spray closed cell in?
Is there a choice for the walls I haven’t mentioned?
Should I plan to spray the rafters, or can I spray in the ceiling joists instead and leave the small attic space vented?
Is there a gradual approach that would be workable across a few seasons?
My budget is tight, but I would be happy to do the project in sensible stages. I just want a really cozy and efficient space.
Any advice would be greatly appreciated.
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