[Bay Kid]

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.

Makes total sense. I guess a roof vent would be a better answer to help cool.