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Old 04-18-2011, 06:44 AM   #1
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Installing radiant barrier in attic


I bought a two 100x4' rolls of radiant barrier to install in the attic of my two story garage. The plan is to install the barrier in the pockets between joists.

My question is what do I do with the roofing nails sticking through the sheathing? They protrude about 1/2" - have to be careful as I've come close to impaling myself on them a time or two. Is it ok that the barrier is punctured by these nails?

In case it's asked, I live in Atlanta. The barrier is going in the whole garage, but mainly for the south facing roof (which already generates a LOT of heat).

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Old 04-18-2011, 04:07 PM   #2
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Installing radiant barrier in attic


I've never seen any radiant barrier that should be installed that way. I assume that since it is a garage, there is not an insulated attic floor? Check manufacturer instructions or search for a diy guide or video, but based on what you've said so far, it should go on the underside of the roof rafters, not between them. It should be continuous.

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Old 04-19-2011, 07:31 AM   #3
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Installing radiant barrier in attic


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Originally Posted by sheslostcontrol View Post
I bought a two 100x4' rolls of radiant barrier to install in the attic of my two story garage. The plan is to install the barrier in the pockets between joists.

My question is what do I do with the roofing nails sticking through the sheathing? They protrude about 1/2" - have to be careful as I've come close to impaling myself on them a time or two. Is it ok that the barrier is punctured by these nails?

In case it's asked, I live in Atlanta. The barrier is going in the whole garage, but mainly for the south facing roof (which already generates a LOT of heat).
When you install a radiant barrier you should fasten it to the roof joists just below the roof surface (not the attic floor) using a staple gun. The small channel between the joists will allow hot air to escape thru your ridge vent, etc. Don't let your attic get hot when you can avoid it.
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Old 11-23-2011, 07:47 AM   #4
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Installing radiant barrier in attic


Hey sheslostcontrol, did you complete this project? The way you described doing it would be wrong, so I hope you listened to the other posters!
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Old 11-23-2011, 08:51 AM   #5
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Installing radiant barrier in attic


Hi I did it just the way the guy above explained. It made a huge difference.

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Old 11-23-2011, 09:04 AM   #6
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Installing radiant barrier in attic


Very happy to hear that!!! Post pics if you can.

Cheers
Carlos
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Old 11-23-2011, 09:14 AM   #7
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Installing radiant barrier in attic


I just did let me know if you can't see it.
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Old 11-23-2011, 09:24 AM   #8
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Installing radiant barrier in attic


Pics are there.

What are you doing with that space that you need to take the heat down?
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Old 11-23-2011, 09:36 AM   #9
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Installing radiant barrier in attic


The upstairs is a finished office and music studio area. I don't have any A/C yet but hope to get a mini split installed sometime in the future.

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Old 11-23-2011, 12:24 PM   #10
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Installing radiant barrier in attic


Okay.

Radiant barriers do have applications in some cases when controlling heat gain from the roof, but they are never a substitute for a proper insulation layer.
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Old 11-23-2011, 12:29 PM   #11
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Installing radiant barrier in attic


That's why I had insulation installed beforehand.


I also insulated the exterior (and interior) walls to help with heat loss and soundproofing. Used cotton batt insulation.
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Old 11-23-2011, 01:04 PM   #12
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Installing radiant barrier in attic


I am curious as to what your location is.

South west states, California, Arizona, Nevada?

Andy.
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Old 11-23-2011, 02:20 PM   #13
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Installing radiant barrier in attic


Georgia

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