Straw walls or clay walls...which is right for you? The answer depends on whether you live somewhere where insulation is beneficial or where high thermal mass is beneficial. Insulating natural building materials include strawbale, light clay straw, and cordwood. Insulation helps keep heat on one side and cold on another side. Thermal mass materials include cob, rammed earth, adobe, stone, etc. Thermal mass absorbs and store heat energy, like a battery.
