Sat, 12 Jul 2008 09:32:50 -0400 from krw :
In article ,
says...
With an air gap, the foil adds a real R-value.
Nonsense. The air gap adds R-value. The foil adds nothing to the
heat conduction. Foils is METAL, which is a CONDUCTOR.
Is it possible that it adds indirectly, by serving as a vapor barrier
so that the outward space stays drier and this is a better insulator?
--
Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://OakRoadSystems.com
Shikata ga nai...