I edited my original post to include the figures for one of the Microporuos Insulation products from Thermal Ceramics, BTU Block Board.

It seems fairly pricey:

http://www.thomasregister.com/olc/Sm...sultstest1.htm

So I was wondering if Henry, or anybody else has any direct experience with it. The heat loss figures are about a third of the Skamol Board, which had been the best of the lot. The question is whether the incredible heat loss figures actually work in practise.

You can download a data sheet about it and other Thermal Ceramics products here:

http://www.thermalceramics.com/liter...datasheets.asp