Then on Monday the 12th, Thierry Soubrier arrived to do the insulating screed in the basement. He is a specialist in hemp and lime screeds. He also specialises in straw wall construction and in clay / lime floor and wall finishes. He is part of a network of like-minded people promoting ecological construction. Here he is unloading the bags of hemp stalk (chenevotte) and cutting them open. He uses a large capacity conventional concrete mixer, and the proportions are 44 litres of water, 35 kilograms of lime, half a bag of chenevotte. I mixed for him while he laid the screed.