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[Gene GeRue <genegerue AT ruralize.com>]

>  The solution used for years and years in pre-engineered metal
> buildings is fiberglas insulation with surprise, a vinyl vapor barrier. Once
> the envelope is sealed with that system treated lumber is not required, and
> additional, more conventional insulation can be added.
>
> http://www.naima.org/pages/resources/faq/faq_metal.html

Warren, that will work on new metal buildings. But I called my local 
building supply place and what they carry is six foot wide. It is intended 
to be placed on the purlins just before the metal is put on.

My other project is retrofitting an A-frame cabin that a guy built here who 
didn't know much of building and who wouldn't take any advice. The A-frames 
are on four-foot centers, so the six-foot faced fiberglass won't work. That 
is my focus for the Celotex, then fiberglass, then interior vapor barrier 
design.