"CJT" wrote in message
...
News wrote:

snip
I always thought the shiny side reflects, so needs to be facing where
heat needs to be reflected back and there needs to be a 1" gap between
that and any other surface. Having it under floors facing down should
not be effective. Yet I have read that some makers say it does not matter
which way it goes, I find that hard to believe.

Then you need to develop an understanding of emmissivity.

I'm sure Nick will elaborate on the wheres and whys of which way it faces
for optimum performance - which is now the latest confused point on
barriers.