Reflective roof paint only helps if you have no insulation (which might be true of a shed, detached garage, etc.). Basic R-4 insulation performs dramatically b

Reflective roof paint only helps if you have no insulation (which might be true of a shed, detached garage, etc.). Basic R-4 insulation performs dramatically better. "A cool roof does not improve energy efficiency if your ceiling is [...] insulated, the roof area temperature is not lowered enough using a paint to make a quantifiable difference."