Comment by mauvehaus
If it's that cold, you probably have a fair amount of roof insulation anyway that's preventing heat absorbed by your roof from being conducted to the conditioned space.
If it's that cold, you probably have a fair amount of roof insulation anyway that's preventing heat absorbed by your roof from being conducted to the conditioned space.
Sure, but the physics still cuts both ways. Either sun hitting the roof causes measurable heating or it does not. The temperature gradient must flow.
Sun heating in Winter = awesome. Sun heating in Summer != awesome.
I am not arguing the strength of the effect, only that you must account for all seasons.