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I finished stapling radiant barrier foil to the rafters a week ago and it's great. The garage used to get in the 90's and 130 under the rafters on 80 degree days. Today it was 90 out with bright sunshine, and the garage stayed under 78, very comfortable. The house was 77, and there is still a small more difficult section to complete.
The foil definitely helps, a lot.
I did it myself so it was quite inexpensive, a $10 stapler, and $65 each for three 500 square foot rolls.
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