| http://www.w3.org/ns/prov#value | - perlite or scoria in cold climates)- earthbag walls filled with soil or insulation, such as perlite, volcanic rock or rice hulls- earth-berming for improved energy performance- earth, stone or recycled brick floors- earth or lime plaster- affordable roof options such as domes, spiral (reciprocal) roofs, green roofs, poles, pallet trusses, metal roofing for collecting rainwater, thatch, etc.- R-45
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