Insulating detached garage attic in central Florida
I’m about to start construction of a 30′ x 30′ concrete block detached garage in central Florida. I’m using attic trusses and plan to use a white raised seam steel roof. I was not planning in insulate the block walls. What is the best way to insulate the roof? I want to keep it a cool as reasonably possible – I might add a window or portable AC, if I have to, but will not run it often. Depending on the final use of the attic, I might even try to condition that space. I’m concerned about moisture buildup inside – wet cars could bring a lot of water in. I was thinking of doing vented soffits, rafter vents (maybe covered with spray foam or foam board?) and a ridge vent – but that might block the exit of moisture brought in by the cars, unless I leave the area by the ridge vent VERY open. I’ve seen newer houses with completely sealed attics, but the amount of mosture that could come in, and the fact that the spce will generally not be conditioned scares me away from that. Ideas?