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thailen 04-10-2011 04:53 PM

Radiant Barrier Dilemma
I've been researching radiant barriers for my attic, which has 6" of floor
fiberglass insulation and noticed that there's a choice between single, double bubble barriers and layers of aluminum foil and other materials, with the cost the highest for the bubbles. Is there a significant difference in heat reflection, given the insulation already in place? Which should I buy?

HomeSealed 04-10-2011 09:53 PM

Where do you live? Radiant barriers are not a good investment in all locations... Regardless, you need to maje sure that you attic is properly air-sealed and insulated to code before giving it any consideration.

thailen 04-11-2011 03:23 AM

Where do I live?
In New Orleans, where summer usually lasts from April - November and winters are very mild.

SPS-1 04-12-2011 08:28 PM

I thought that radiant barriers in a hot climate were normally on the underside of the roof. The first result from a Google search seems to agree with me.

Gary in WA 04-12-2011 11:08 PM

Your 6" of insulation is about R-20, yet your area, Zone #2, requires R-30. I would air seal, as H.S. said, then add 1/3 more to at least the minimum Code;


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