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Instead of all the extra engineering, look @ earth-sheltered homes (just Google). 6+ feet of soil on top and most of the circumference will maintain the soil's average temperature of 50-55 degrees F inside the home. No freezing pipes in the winter; heating from 55 degrees to your comfort level in the winter instead of from 30 or below; cooling in the summer is not a great requirement. Very interesting plans out there that means the home is lit well and airy not the expected dark and damp. Just my $.02. You original picture depicted a hillside construction...ideal! No real maintenance, either!
Bill
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