Check your local building codes to see if uninsulated construction will
be permitted for a residence. Without any idea as to your climate it's hard
to give much advice. There are insulation materials which are not made of
plastic or fiberglass. Ditto vapor barriers.
You seem to be focused on stick-built structure but other materials will
also work. Rammed earth, cinder block, et c.
Here's a possibility to consider:
Build the shell and cover it with exterior 4x8 plywood, as you are
aware. Then put in the insulation, and maybe a vapor barrier..
and sheath the inside with plywood, so that from the inside, it
looks like an exterior wall.
Then, put in another stud frame, identical to the outside wall frame
on the inside, up against the interior sheathing.
From the inside, it will look like a bare framed, exterior plywood
like you enjoy. But you will have a layer of insulation in the
stud frame that can be
airtight..... This "interior" dummy frame will be inexpensive, you
will be well insulated, AND if you , or some future buyer, were
to decide to add more insulation and sheetrock at a later time,
be all set...... It is a win-win....
Just a possible suggestion to get the appearance you want, and
have an insulated structure at the same time......
Good luck with that. I'm sure there are umpty-ump regulations requiring
insulation on new construction.
By requiring every new building to have a minimum of insulation, gobs of
energy will be saved, lower costs to everyone, conserving precious
resources, and providing jobs for legions of compliance officers.
Besides, it's for the children.
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