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Old 08-30-2012, 12:11 PM   #1
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Radiant barrier


I'd like to reduce the attic temperatures, currently 115 vs 90 degrees outside, maybe with a radiant barrier. House and garage have soffits and ridge vents, was looking at stapling foil to the rafters, especially on the west side, if that makes sense. Anyone have experience with this approach and can tell me what degrees lowering should I expect up there?
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Old 08-31-2012, 09:04 AM   #2
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Radiant barrier


I am working on a similar project. Please advise how your project turned out and any suggestions you can offer. Thanks,

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Old 08-31-2012, 02:07 PM   #3
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Radiant barrier


How about opinions from anyone even if you don't have experience?
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Old 09-01-2012, 02:08 PM   #4
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Radiant barrier


I did this in my attic about 5 yrs ago, and although I don't have any numbers to prove it, I believe it made a big difference. I installed the foil on the rafters down to about 2-3' from the soffit vents (as close as I could get, as my roof is a low pitch) up to about 14" at the peak. I only have 2 gable vents, but they both have exh fans. Couldn't tell you the brand I used, but it was a heavy foil with thread reinforcement in it. You don't want anything too light, or it'll tear when your trying to staple it to the rafters. My roof faces east & west, so I did both sides, plus the south end of the attic wall. I have been going to do the garage attic, but never got to it, as the garage is not insulated. I'm in the San Jose area, so we can get some HOT weather in the summer.
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Old 09-02-2012, 09:25 AM   #5
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Radiant barrier


what is the effect of the foil on the life span of the roof shingles? I would think it would shorten the span greatly as the roof sheathing heats up. I would lean toward more ceiling insulation or a breathable reflective barrier(if one exists) above the insulation allowing more heated are the vent through the gables.

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Old 09-02-2012, 10:20 AM   #6
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Radiant barrier


Should lower attic temp by 10 degrees or so on the hottest/sunniest days.
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Old 09-02-2012, 12:06 PM   #7
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Radiant barrier


You might be better off to send this to the roofing site .
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Old 09-04-2012, 12:08 AM   #8
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Radiant barrier


Quote:
Originally Posted by beenthere View Post
Should lower attic temp by 10 degrees or so on the hottest/sunniest days.

Rats. I was thinking with "up to 96% of the suns radiant energy reflected" I would be down closer to ambient temp. I wonder if I did just the West half of the roof I would get lowered 5 degrees?

Did not realize there was a roofing DIY till you pointed it out. Don't know how to transfer thread though.
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Old 09-04-2012, 07:50 PM   #9
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Moved to Roofing forum.
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Old 09-04-2012, 08:19 PM   #10
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Radiant barrier


Radiant barriers have application value in certain climates.

In other situations, they can be net negative in impact.

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