My house has light colored "silver" shingles, the garage faces due east and gets no shade. The white garage door would get over 110 degrees and the ceiling would be 98 deg. and you could feel the heat radiating on the top of your head. I had 8 inches of insulation blown in above my attic and added a Styrofoam garage door insulation kit. This dropped the temperature to 6-8 degrees below the outside ambient temperature during the afternoon and evening.
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