Quote:
Originally Posted by retiredguy123
If you have a hot space adjacent to a cooler space, heat energy will flow from the hot space to the cooler space until both spaces become the same temperature. Adding insulation between these spaces will slow down, but not prevent, the heat transfer process. So, adding insulation anywhere will not provide any lasting cooling effect. That is why builders do not add insulation to a garage ceiling. Also, blowing 90+ degree air into any space will not cool the space any lower than 90 degrees.
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This is a little misleading. True energy will flow from hot to cold but when the attic superheats the garage ceiling is like a radiator for a very long time. I thought like you but I gave in and insulated my attic. The result was a noticable reduction in temperature in my garage.
Regardless of the theory, all I can tell you is what I experienced.
BTW the reason why the builder doesn't insulate the garage ceiling is because it's non-living space. Same reasoning with the Lanai. It saves them money.