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Posted by Beatniks on November 25, 2007, 3:20 pm
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I would like to install a solar air heater atop a flat tar roof that
pitches slightly facing north. I'd thought about using the top of the
roof as the back of my thermal enclosure by building a "sandbox" type
of structure and stretching green house plastic across it. Then, blow
forced air through it. All in all I could make a 20' x 60' structure
for about $300.
I am worried about 4 things.:
1. Roof damage. I would remove the plastic in the spring, but if I
missed a few days...
2. Off odors. Would chemicals etc. bake out of the tar???
3. Hail, ice, snow damage to the plastic.
4. The roof tilts slightly to the north (2 degree). Would it be worth
my while to build a structure that faces south.
Does anybody have experience with solar heaters on tar roofs???
Thanks
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