A material made by mixing hemp with lime and water forms a new layer of insulation around this house in Belgium, as part of a renovation by Ghent studio Martens Van Caimere Architecten
Known as hempcrete, the hemp-based render was applied in thick layers to all four walls of the small house to help it retain heat and make the structure more weather-resistant. The result is a textured surface with a similar appearance to rammed earth.
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http://www.dezeen.com/2015/10/27/martens-van-caimere-architecten-hempcrete-hemp-render-striated-skin-renovated-house-belgium/