Bloc de chanvre ep 15cm

Construction block made with hemp

Hempcrete is a mixture of hemp hurds and lime (possibly including sand, pozzolans or cement) used as a material for construction and insulation.[1] It is marketed under names like Hemcrete, Canobiote, Canosmose, and Isochanvre.[2] Hempcrete is easier to work than traditional lime mixes and acts as an insulator and moisture regulator. It lacks the brittleness of cement and consequently does not need expansion joints.[2]

However, the typical compressive strength is around 1 MPa[3], over 20× lower than low grade concrete. This means that Hempcrete walls should be used together with a frame of another material that supports the vertical load in building construction. Hempcrete's density is 15% of traditional concrete, as well as carbon negative.[4] The strength and flexibility means that hemp foundations are resistant to stress-induced cracking and breaking, even in earthquake-prone areas[dubious ]. The building material also is self-insulating; resistant to rotting, rodents and insects; and fireproof, waterproof and weather resistant.[5]

Hempcrete can also absorb CO2 gas. About 110kg of CO2 can be absobed and locked up by 1m2 of hempcrete wall.[6]

Pipes can be made out of hempcrete, and they too have greater flexibility and greater elasticity than those made from conventional materials[citation needed], and they are resistant to cracking. Stones can also be made out of hemp by wetting the stalk's cellulose, and forming it into a hard black rock, which can be cut, drilled, cast, carved or formed into any shape.[5]


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