Mike wrote:

"The Natural Philosopher" wrote in message
...

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


Not quite. The best insulator is a vacuum. It's just nobody has found a
way of encasing a building in it yet, though I'm sure Doctor Dickhead/IMM
will detail some place where it's been done.


Ok the best COMERCIALLY AVAILABLE insulation material...ok?