Insulating walls (pole barn)
I’m going to insulate part of my 36’x48’ pole barn for use as a living space. My plan is to put 1-1/2” Foamular between the 2×6 girts (against metal siding). Then place an additional layer of 1-1/2” layer of Foamular on the inside of the grits (over first layer). This layer would be sealed with tape and sealant. I would then fill the remaining space with 3-1/2” Fiberglass insulation batts. This would be covered by Sheetrock. Do you see any issues with this approach?