Quote:
Originally Posted by retiredguy123
The purpose for insulation is to slow down the heat transfer process between a conditioned space and an unconditioned space. So, you can reduce the amount of energy required to heat or cool the conditioned space. But, when both spaces are unconditioned, like the garage and the attic space above it, the insulation doesn't really do much because, in a short period of time, both unconditioned spaces will reach an equilibrium temperature. That is why builders do not insulate these areas.
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Exactly correct.
It can slow down the reaching equilibrium, but not stop it. Adding an "exhaust fan" into the garage will also help. Neither will "cool" the unconditioned area, but both extend how long it takes to get hot. With enough exhaust the best that can be hoped for is to not get "hotter" than the outside temp. But, that is not easy (possible?) to reach, most likely will always be slightly warmer in the afternoon.