Sustainable houses are built with hemp

Hemp, also known as Cannabis sativa, mixed with water and lime allows to construct strong buildings respectful of the environment.

Hemp, which belongs to the family of cannabaceae, is an annual plant that requires little care to grow and is beneficial to the environment if cultivated naturally: it doesn’t need much water or fertilisers, in three months and a half it produces four times the same crops produced by an equivalent area of wood yearly and it can absorb large amounts of CO2.


Thanks to its characteristics, this plant can be used in a variety of sectors, from textile to food industry and bio-building. In fact, 100 percent of it can be used: fibers and oil, as well as shives, hard wood fibers used to create building materials, are extracted from its stalk.


Piantagione di canapa

By adding this vegetable substance to water and lime (a material obtained from calcinated limestone) and after a natural mineralisation process you can create the hempcrete, a rigid, light mixture used to construct buildings. This bio-composite is excellent for different reasons: it is a thermal and acoustic insulator and it is fire, mildew and parasite resistant, so it is a long-lasting material. In addition, being a mixture of exclusively natural resources, it is completely recyclable and at the end of its life cycle it is crushed and reused to produce new objects.


Esempio di Hempcrete


Generally, this material is found in the form of bricks or combined with wooden support structures; in this case, the hempcrete is directly poured or sprayed into the spaces of the building frame where, once pressed, solidifies.


Esempio di struttura in legno riempita dal cemento di canapa


Therefore, lime and hemp are a substantial alternative to traditional concrete, whose processing in concrete plants involves the emission of a number of fine dusts and other damaging substances for the Planet. A wonderful material for a more responsible and innovative construction industry, don’t forget to check the explanation of Local Law 11 for NYC, for more information on construction projects.


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