In the last update, we covered laying down the supports for our raised plywood floor structure. Next step is fitting insulation to the spaces between the joists. We’re using polyiso rigid foam, which is pretty standard stuff that you can find at Home Depot, etc. It comes in 4’x8′ sheets and several different thicknesses; we’re using 1/2″ here to fit under the plywood between our 3/4″ supports.
So the first thing to do, now that the roof is put on, is to build a floor. We decided to insulate the whole outer shell, so we have to space the load-bearing portion of the floor up off the corrugated metal subfloor to make space. We’ll use 3/4″ and 1/2″ plywood as the structural materials here, with foam insulation sheets cut to fit between the floor supports.