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Nesgroup address: alt.building.construction - Date & Time for the message: Wed, 16 Mar 2005 01:26:03 -0800 /

Author of the message: dirt farmer

Title of the message:
Re: Radiant panels on the roof - desert sun

Text of the message:
> Right.  Which is why you need an airspace, and why dust shouldn't touch

> it.  Reduce the reflectivity, and you'll lose performance.  Touch a
> part of the building, and the heat will radiate into that part -- think
> of it as grounding the foil.
>
> It is possible to install a radiant barrier foil side up and in contact
> with an airspace.  But over time, it will get dusty, and stop working
> well.
>

Foil side up is the only reasonable solution for an open pitched roof (no
attic).  Foil side up or down the air space needs to be vented.  I spoke to the
manufacturer and they said in my situation the foil side can go up or down...as
long as there is at least a 3/4" airspace on the foil side.
So the task at hand is how to engineer a radiant barrier for an attic less
roof.
The best solution I have so far is:
Foil side up
No felt
Corrugated sheet metal roofing or any other metal or tile roofing that can be



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