On Fri, 25 Jul 2008 23:35:49 +0100, a particular chimpanzee, Andy
Dingley randomly hit the keyboard and
produced:

On Fri, 25 Jul 2008 20:44:57 +0100, Hugo Nebula abuse@localhost wrote:

Multi-foils have been caught out in recent years lying through their
teeth about the performance of their materials. Some manufacturers
have had it tested properly,

"properly" is arguable here.

Actually, they have. One manufacturer (Thinsulex, IIRC) has a BBA
certificate for their product.

You may be thinking of the discredited TRADA test. TRADA, who are UKAS
accredited but not for insulation, certified Tri-Iso Super 9 as having
the equivalent R-value as 200mm of Rockwool. Many in Building Control
questioned the methodology of the test[*], but no-one seemed to have
spotted that their certificate wasn't worth the paper it was emailed
on.
[*] This involved two small 'rabbit hutches' in the south of France,
one insulated with 200mm Rockwool, the other with Tri-Iso. The test
reports said that both used similar amounts of energy to maintain the
internal temperature, which therefore proved that Tri-Iso was the
equivalent of 200mm Rockwool. What the report didn't say, and what
TRADA refused to say when asked, was what the amount of energy used
was. In other words, both 'hutches' could have been unheated.
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"