Roofing substrate
I am building a new house in upstate South Carolina. The builder has recommended using OSB with a foil backing for the roofing substrate with 30 inch blown in insulation. From what I have read the foil backed OSB material is worth incorporating but I am not sure if there is not a more effective insulation configuration (e.g. batt or foam) that would offer better performance at near the same cost. I do know foam insulation is more expensive and maybe overkill. What are your recommendations?
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