Insulated Roof Decking
I live in the Houston (area 2B) area and am in need of a new roof. It is a 2-story Cape Cod style home situated N-S. The upstairs portion is approximately 1,080 sq ft with cathedral ceilings (R-19) and numerous sky lights (110 sq ft-double paned, low E) and 2 small double-paned windows. The area is cooled by a 4-ton unit, which has trouble keeping it cooler than 79 degrees during our 100 degree days (unit has been serviced annually and duct work is in good condition).
Question 1: Would I be better off using Atlas Nailable Cross Vent/Rb roof decking that is vented with a radiant barrier and a insulation value of R-25 or ACH Foam Nailable roof decking that is not vented and has no radiant barrier but has a R value up to R-43?
Question 2: Are there any other options/ideas for decreasing my energy cost for this area?
Question 3: Are the “cool” roof’s worth invesigation?
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