Good point DougB - I believe the idea is it prevents the incredible heat from the roof from coming down into the garage space. We recently had the space above our enclosed lanai insulated and it is interesting how there is an actual space between the ceiling and about 3 inches down that is cool. So the heat is no longer coming from the ceiling, but from the single pane windows (rising heat). Next on the list is to have the windows tinted to hopefully block the heat - already have solar screens but they only block the UV rays not the heat.
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