Steve Firth wrote:

Bedouin wrote:


What's the best thin insulation available?


Compressed Dr Evil, it's so dense it allows nothing through, not even a
clue.

Back when I laid the underfloor heating in the kitchen, my wife sourced
some extremely thin insulation (about 3-5mm) that claimed to be as good
as 50mm polystyrene. I'll see if I can find the sample and get the
details off it.

The very best insulator is polyisocyanurate board. Its precisely twice
as good as polystyrene and costs about 4 times as much. Its sold as celotex.


In the meantime someone else may recognise the stuff, it has two smooth
sheets of grey plastic (may be polyethylene or polypropylene) with a
foam sandwich.

Its called a load of old ********.