"Hugo Nebula" abuse@localhost wrote in message
...
On Fri, 25 Jul 2008 20:55:16 +0100, a particular chimpanzee, Andy Hall
randomly hit the keyboard and produced:

On 2008-07-25 20:44:57 +0100, Hugo Nebula abuse@localhost said:

Multi-foils have been caught out in recent years lying through their
teeth about the performance of their materials....Real world
testing has been done proving that anything more than 1.7m²K/W is
bull****.

So no better than a rather thin sheet of Celotex?

Equivalent to a 40mm sheet, yes. Which means that, when installed
properly with a 25mm airgap either side, it is thicker than PIR
insulation.

A piece of cling film with a 25 mm air gap either side would be as good.
Its the air supplying the insulation not the foil.