Importance of Solar Reflectance Index (SRI)
So I’m looking to do a re-roof of my house in Huntington Beach, CA (US Climate Zone 3, CA Climate Zone 6) and I’m wondering if its worth it to upgrade from a standard asphalt shingle with an SRI of 17 to a concrete tile with an SRI of 49. Will I see a big reduction in my attic temperatures by focusing on the SRI of the roofing material? Or will the money be better spent on more insulation?
BTW, I would love to do a metal roof, but its not very common here and is also way over my budget.
Edit: After some reading I think it is important to mention that my attic is unconditioned and vented. And my air ducts are in the attic with the air handler in the living space. The insulation in my attic is poor right now, but I plan on removing the existing insulation and installing at minimum R-38 of new insulation (probably blown-in cellulose).
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