Quote:
Originally Posted by C. C. Rider
You're totally wrong about that. If you don't have insulation in the ceiling, then heat will RADIATE down through the ceiling and make the area below even hotter.
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Adding insulation between two unconditioned spaces will only slow down the heat transfer process, but eventually, both spaces will become the same temperature. At sometimes during the day, the garage will become hotter than the attic and the insulation will actually slow down the heat transfer upwards into the attic. Builders never insulate between unconditioned spaces because it provides no benefit in terms of long term temperature differences.