We have recently built a detached garage/workshop behind our house in South GA. We will not use it as a garage to park, but mainly as a workshop for woodworking and other projects,storage and tool/yard equipment. We have already insulated it and finished the drywall/paint for the walls. We were wondering if it would be OK to use the blue insulating foam board for the ceilings instead of drywall. We have installed a large window unit AC to keep it cool when we work in there (as we live in South GA and it is hot here much of the year).Or should we just go ahead and use drywall or OSB for the ceilings. The foam board would go up quicker and is so much lighter that installing drywall overhead.What do y'all think?
Not a good idea to use foamboard in a garage. It is highly combustible, and therefore most foams say right on the face that they cannot be left exposed without an ignition barrier such as plywood or sheetrock. The same is true with kraft-faced insulation...Can't leave the face exposed to the inside of places where it could be caught on fire, such as basements and storage areas.