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additional allow arch backfill bentonite berm bond beam built cement blocks composting toilet concrete construction cool cordwood cost courtyard covered created diameter dome drain field drain tile drainage dugout dwelling Earth Lodge earth shelter earth-sheltered earth-sheltered home Emil Christensen excavation feet fill Flexicore floor plan footings Freedom Tunnel French drain French Intensive front girders glass gravel greenhouse ground heat inches inside insulation interior land Landscaping light living load located materials mobile home mode moisture plants plastic plumbing polyethylene polyurethane possible post-and-beam posts poured Prairie Cocoon problem protect rafters railroad rammed earth rebar recycled reinforcing rock rods roof shear sheeting shell shoring logs skylights slope soil pipe solar chimney steel storage surface temperature thermal tunnelled space Twin Tees underground building underground home underground structure units utilized ventilation vertical waterproofing wind winter wire