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16 Jul ’12
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So, I just finished reading a couple of rob roys books. One on earth sheltered houses, and the other on cordwood. He doesn't recommend using cordwood walls for the portions of a home below grade/earth sheltered.
Is this because of fear of wood rot, or a structural concern from the horizontal pressure?
If it is simply problems of wood rot, couldn't the cordwood wall be covered with insulation (possibly spray since cordwood walls aren't quite flat), vapor/water barrier, just as you would with a poured concrete wall?
Thanks,
Nick
15 Feb ’12
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Rob Roy did a test with this and had failure with the wall. I think it was because of lateral pressure and water penetration into the wood causing it to swell which further caused issues by breaking up the mortar beds. I think if cedar was used which has a high rot resistance and low swelling it could be worked around but I would always be concerned with that being a failure point. Another option would to use the slip form stone method but that would be a nightmare with applying water proofing and insulation on the exterior
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