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gbwillson

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Reply with quote  #1 
According to DOW, if you take a sheet of their foil-faced polyiso and leave a ¾" gap between the foil side of the insulation and the back of your collector, This dead-air gap will give you an additional R value of 2.8. Nice free bonus for nothing but air! So if you were to use ½" polyiso with an R-Value of 3.3 you can almost double the effective R-Value to 6.1.

Greg in MN[cool]

KevinH

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Reply with quote  #2 
I have thought of doing something similar before (two 1/2" sheets with air gap instead of 1"), but since the polyiso is part of the structure on my collectors I stayed with 1".  I didn't know it would boost the R value that much.

Kevin H
MN
cwwilson721

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Reply with quote  #3 
For those of you in the Frozen Tundra Wasteland (North of the Mason-Dixon Line), that could come in REAL handy...

I guess there are REAL advantages to living in the South..Like, if it snows, it'll melt tomorrow. Cold here is considered below freezing, and doesn't happen much...lol

Then again, today is supposed to reach 96, already 92, with Heat Index already over 109...so you gets what you gets

Remember, tho, that should be a SEALED air gap. Caulk around all edges on both sheets to maximize the insulative value of the air gap.
gbwillson

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Reply with quote  #4 
I didn't think so either, but it's printed on the sheets. 

Greg

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cwwilson721

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Reply with quote  #5 
It's the same principle as insulated glass. Two sheets, with a sealed chamber in between. That's why they say "foil facing each other", better air seal
stmbtwle

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Reply with quote  #6 
"Frozen Tundra Wasteland (north of the Mason-Dixon Line)"

Gotta love it, Carl!

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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