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To radiant barrier or not to radiant barrier, that is the question...

9/30/2010

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When I was still in school for my master’s degree in Environmental Engineering, my advisor prided himself on the fact that he did not rely on the latest equipment and essays for his experiments, but rather, a solid understanding of the science and years of experience and literature reviews. I also tend to gravitate towards this style in my own career, and I am somewhat of a green skeptic especially with all the green-washing going on. For the longest time, I avoided recommending radiant barriers during my energy audits because I thought they were another green-scam; well, now I can say I am only half right.

There are three types of radiant barriers on the market:

1.       Spray on radiant barrier

2.      Radiant barrier chips

3.      Radiant barrier sheets


I still recommend avoiding #1 and #2 at all costs, even if you can get it for free! On the other hand, the radiant barrier sheets do work and are ideal for a southern Arizona climate and home style. With over 300 days of sun, radiant barriers will reflect the source of heat gain that insulation can’t stop, and that is radiant heat. They will keep the attic cooler in the summer, and, because most of southern Arizona’s homes are built with the ductwork in the attic, the AC units will not have to work as hard to offset the attic air heating up the ductwork.

http://www.ornl.gov/sci/roofs+walls/radiant/rb_01.html
http://www.ornl.gov/sci/roofs+walls/radiant/rb_02.html
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