Quote:
Originally Posted by thevillages2013
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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You would need eight inches or more of spray insulation under your sheathing to match the blown in fiberglass that comes with the house. I like spray foam, but it is much more expensive than fiberglass. If you had spray insulation under your sheathing so you wouldn’t need fiberglass on your ceiling, you would have a large insulated but uncooled space, unless you cooled the attic as well. If you did, you might need a larger air conditioner, and you would pay to cool the attic as well.