--- In papercreters@yahoogroups.com, Mikey Sklar <sklarm-yahoo@...>
wrote:
>
> The papercrete would give you good insulation around r=50 or so at
> 12" thick. However, it is not thermal mass.
It is not HIGH thermal mass. Almost anything has some thermal mass,
unless it has no heat storage capability at all. The papercrete will
be pretty low, wood will be a bit better but not alot.
> If you two are willing to work your butts off for a few years and
> spend the few thousand dollars on mixer, compressors, sprayers,
> and pumps you can probably pull off a inexpensive well insulated
> home.
With the R36 (minimum) from the papercrete and ~R16 (minimum) from
the cordwood I think you should have plenty of insulation. If you
want thermal mass, then perhaps you should look to earth ships or
other tamped earth methods. It does of course depend on your PC mix,
if you go with high clay content or high pozzolan content I suspect
you could get significant thermal mass, but at the cost of
insulative value.
I don't disagree with Mikey's time or energy estimate, but I think
you could do it for less money if you are thrifty and/or innovative.
Sprayers, pumps, and compressors do not sound necessary for this
application if you went with either block or slip form. You could
probably slip form using the cordwood as one side of the form, even,
reducing material for forms.
I would not try to spray with bad elbows. My VERY limited experience
sayd that you would have to be very creative with pulleys or other
assistance to pull that off. Off grid will add some challenges, I
would suggest a tow mixer if you can get one. If not then a gas
mortar mixer might be acceptable, although it will slow you down
some.
Hope that helps.
- Ernie
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