The document discusses hemp and lime as building materials and their properties. It provides the following key points: 1) Hemp and lime are environmentally friendly building materials with low embodied energy. Hemp utilizes carbon dioxide during growth and lime absorbs carbon dioxide as it sets. 2) Laboratory tests found that mixes of hemp hurds, fibers, lime and sand can form durable and lightweight composite materials with compressive strengths ranging from 38 to 219 MPa. 3) The optimum mix is 5:1 hemp hurds to lime by volume, with a compressive strength of 0.7 MPa and estimated thermal conductivity of 0.11 W/mk. However, a 3:1