Converting a garage into an office?
Existing attached garage: Slab on grade, uninsulated slab, uninsulated walls. Live in northern California, in Marin County – close to the coast. No moisture problems on slab – seems pretty dry.
I was going to put in a sub floor as close as possible to existing slab – frame directly on top of slab.
QUESTION: Should I fill in between the floor framing (2 x 4’s) with rigid insulation and put in directly on the floor or leave a gap (airspace) and install it tight to the subfloor? Or, simply fill the void completely with batt insulation? Money is an issue here as well, so blown insulation is not an option. It’s a DIY project. Also, I was thinking that I would not need a vapor barrier on the floor as it seems dry.