plastering (Wojciechowska, 2001). Builders like Kelly Hart have found that replacing the soil with volcanic rock is a means of adding substantial insulation value to the wallsequivalent to that of straw bales (Hart, 2002). Harts house also features a papercrete plaster, made up of a slurry of paper fibre with just a bit of Portland cement added, which breathes better than cement-heavy stucco.