I'm building a 42 x 50 pole barn.
I'm planning on heating it and would like it to stay cool in the summer.
This is my plan. Lay foil-bubble-foil on the purlins, then 1x4 vertical furring strips 2' apart, then 1x4 horizontal strips 2' apart then asphalt underlayment(TARAH no. 15 ASTM) seemed...