Reduction in roof temperatures of 5.1C or about 10 degees F. Sounds significant, but does it really make your hvac bill lower, when you have a vented attic?
not sure of cost per square foot.
I was also researching cool roof paint, basically white paint. Is that worth the headache of applying? Seems like the cost per square foot is really high around 40 cents.
henry's solar flex is one brand.
obviously these products are only beneficial in southern climates. looking to apply in Carolinas.