We (read my DH here) put the foam insulation sheets with the foil covering up when I realized that the heat was all going out the ridge vent last winter. We figured it would help in the summer too. I have not covered the walls, and use the space between the studs for storage, small shelves, etc. but at some point I guess I might do it on the sunny side of the building.
PS. He just nailed it to the roof studs, so there is about a4" gap between the insulation & the actual roof.
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