I am building a house in Iowa by the strict requirements
and dimensionality of Sthapatya-ved. As you probably know,
these dimensions are specific to certain harmonic
structures generated by the architectural style and my
astologic chart. The outer walls will be approximately 10.5
inches thick. I would like to use some sort of straw/clay
mixture, but I also live in a very cold climate. It is not
unusual to have -10 degree temperatures for several weeks
on end. I have friends who built with rammed earth and
their environment is miserable during winter, always
fighting the fly-wheeling of energy in the earth structure.
Can you shed any light on the true insulation value of a
straw clay mixture in this climate.

Answer Posted / guest

Clay for building has simillar insulation property to
rammed earth as it is the same material just applied in a
different way. As you have mentioned it really performs
best where thermal mass is needed. Straw bales have
insulation value twice that of the building regulations
reguirement. When you mix the two together, depending on
what proportions you mix you get somewhere in between the
two. The best straw clay walls for this type of climate are
ones where you mix as much straw with the clay as possible,
to obtain as high an insulation value as possible, then
apply thick internal earthen plaster and south-facing
windows for the earthen plaster to act as thermal mass
inside.

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