replying to David Bonnell, Stefan wrote:
Although i couldn't tell you what others do, and I'm not proficient in state to
state housing code, i can say this all with confidence. I have builded (built)
12 high efficiency houses, 6 in Maine 3 in Minnesota, 1 in Wisconsin, 2 in
Exterior walls need to be built to the code of the area you are building. Code
is by all means a minimum requirement, anything beyond (better) code is good.
So start with 2x 10 exterior walls. After framing and siding, before wiring
and plumbing, build a second wall inside the exterior wall, running parallel.
This interior wall should NOT be structural. Leave a space of 1-3 inches
between walls, and at no point should they touch. Plan your exterior size
accordingly. Making your basement 10 to 12 inches thick instead of 8 will help
immensely. Insulate the excretor wall with the proper sized insulation, and
insulate the interrupt wall like wise leaving the couple of inches as a dead air
space, which BTW could also be insulated but would only invade the efficiency
by a fraction. In doing the roof, follow the same principle, insulated the
rafters or trusses, and so the cowling and insulate it also. Plan ahead for
your desired ceiling height. I hope this helps you, and if you have questions,
i can be emailed through this website.