daestrom wrote:
However, we noted that the BM TRADA report did specify an overall
resistance RT) of 5.0mēK/W derived from the in situ testing...
Unless this products RT value is calculated by taking the 'in-situ'
performance and *subtracting* the insulative performance of those items
common to *all* installations, the RT value is inflated by those other factors.
In this case, one would hope they derived by subtracting. Nobody seems
to have disputed the result that it worked as well as the rock wool did.
... Reflectix does advertise some system R-values:
http://www.reflectixinc.com/script/p...duct.asp?ID=64
http://www.reflectixinc.com/script/p...duct.asp?ID=77
http://www.majorgeothermal.com/PDFs/.../Solutions.pdf
The US R16.8 crawl space number is interesting.
That number includes the other stuff, as the FTC-mandated "system R-value,"
with a substantial contribution from the foil surface. A non-radiant maker
could also legally advertise a system R-value in the US.
Nick