I do not agree with your presumptions about insulation thickness.
> Urethane foam over 4" thick gives very little additional insulation
over
> what is achieved in 4".
>
> EPS over 6" shows little benefit.
>
While these rules of thumb may have been accurate at one time, for
typical stud frame construction, in a typical temperate climate in
the U.S., they were intended to create maximum profits for commercial
builders and suppliers. Please quote your source for these numbers.
Who said it? Where? Do you have a website that we can see?
If insulation is getting inserted between studs in a stud wall, there
is a big limitation. The insulation cannot change the performance of
the studs themselves. The studs inherintly limit the thickness of
insulation that can be inserted. They also create an obsticle at
regular intervals where gaps in the insulation often appear. To
create great thicknesses using standard stick framing, builders would
have to design a double stud wall with a gap that could be filled
with insulation. It is prohibitively difficult TO CONVINCE
CONVENTIONAL BUYERS to pay the extra expense (at least nearly
doubling the framing costs). The long term economic considerations
about fuel reductions don't enter into that decision. Typical
consumers won't pay the extra when there is a cheaper house for sale
down the street that looks just as nice on the surface.
Papercrete builders do not need to be constrained by the same
limitations. Papercrete isn't traditional insulation, and isn't
often used in standard stick frame construction. This is a material
that can be both an insuator and a compressive structural component
of the structure. It requires a shift in thinking.
The old axioms listed above are outdated, do not apply to arctic
climates, and need to be completely reconsidered.
I will address the basic methodology for a cost/benefit analysis as
it pertains to insulation thickness in another post.
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