One wise man said, "Don't be silly." Maybe he meant cannabis. It has countless beneficial properties, not only therapeutic, but also technologically usable. Technical hemp is used for the textile industry, also for the production of paper, which was first produced from hemp in ancient China. And last but not least, it is increasingly used for the construction of ecological houses.


Hemp waste

Behind everything is a hemp shingle. Hemp has been used in buildings for a long time, but cotton and grain have gradually pushed the crop out. So grain straw is now widely used in construction for insulation. The Czechia used to be even a great power in cannabis cultivation and there are ideal conditions for this crop. Hemp hatchery or waste biomass in the processing of hemp products comes to the fore again only recently, when the amount of space for growing this crop increases. Until recently, the lining had to be imported from Europe, which significantly increased the price of buildings and lacked ecological meaning.

Concrete that cleans

For construction purposes, the soffers are made of so-called hemp concrete. It is a highly thermally and sound-insulating material that is fully biodegradable and successfully resists all fungi, pests and fire. Such concrete is solid within a few hours. Due to chemical processes, concrete becomes harder for many years after delivery. The material also removes CO from the air2, so it actually cleans the air. It is a building material with a so-called negative carbon footprint. Perhaps buildings of this type could largely avert an impending climate catastrophe in the future. 

Lighter than air

All you have to do is have the foundations and construction, most often made of plywood. The structure is then poured with hemp concrete, ie a mixture of lint, lime, water and cement. For the construction of one house, shingles from a field of about two hectares are needed. Concrete can also be used on floors and even on the roof of a house. Thanks to the insulating properties of the hemp material, there is no need to further insulate the building. In addition, hemp concrete is lighter than ordinary concrete and does not require as much heavy equipment, which has a positive effect on the landscape where the house is being built.

for dust you are and to dust you will return

After several hundred years of use, the hemp house can simply be spread out on the plot. During that time, it absorbs about 7 tons of CO2. Compared to conventional constructions, such a house is also environmentally friendly - current building materials are responsible for about 2/3 of the world's total waste. They must also be treated differently with carcinogens and volatiles to ensure their stability and quality. This is not necessary at all for cannabis. Hemp masonry can be applied to wall constructions, sprayed on one side on the wall, even printed on a 3D printer or built from hemp blocks. The construction goes quite fast, with everything the house costs within a few months and the price is comparable to classic houses of the same size. 

It grows like mushrooms after rain

Not surprisingly, the first cannabis house was built in Amsterdam. Although unofficially, the Czechs in the Litoměřice region tried to build the first cannabis construction, where his plans were stopped by distrustful authorities. And they complicate the situation to this day - the construction of a hemp house requires non - flammability certification, which is relatively expensive for many providers of this material and is not recognized by Czech legislation. At present, multinational companies, such as Marks & Spencer, are also refocusing on cannabis construction. Experience from practice shows that even electromagnetic radiation from outside does not penetrate into a house with hemp walls. In addition, the energy consumption values of these buildings are lower than originally expected. 

Hemp material has great potential. Such buildings fit perfectly into the color of the landscape and, thanks to their low cost, they are increasingly in demand. 


"Behind Everything is a Hemp Sheath"

"After several hundred years of use, the hemp house can be spread out on the plot"

Photo: istock.com