In our area in Pine Hills the builder used Tech Shield roof decking. Each sheet of 4x8x7/16 roof decking (oriented strand board) OSB has a film (like aluminum foil) on the bottom of it. I can tell you that it definitely makes a difference in the attic temperature. This is not my first experience with this product. Also there was a company in Ga that coated the bottom of the roof decking and any gables with spray foam insulation. It works so well there was is no ceiling insulation needed
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