I was looking up some info on a problem with an aluminum clad sliding door
that a friend has and ran across this video.

Some fluff, some science...

Interesting section on the cladding acting as an exterior vapor barrier and
causing rot in colder climates as moisture tries to move from the interior
of the house to the outside.

http://m.youtube.com/#/watch?v=YP0o9...DYP0 o9do4eSc

"DerbyDad03" wrote in message
...
I was looking up some info on a problem with an aluminum clad sliding door
that a friend has and ran across this video.

Some fluff, some science...

Interesting section on the cladding acting as an exterior vapor barrier
and
causing rot in colder climates as moisture tries to move from the interior
of the house to the outside.

http://m.youtube.com/#/watch?v=YP0o9...DYP0 o9do4eSc

Vapour barrier should always go on the warm side of insulation. (If vapour
permeable)
So inside the building for heating applications, outside for colling.

Both sides if heating and cooling are the case.

http://en.wikipedia.org/wiki/Interstitial_condensation