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The principal material for the project is Hempcrete, made of the woody internal stem of the Cannabis sativa plant, which is processed into chips and mixed with a lime-based binder. That concoction is then sprayed on, poured into slabs or formed into blocks like concrete to create the shell of a building. Interior surfaces are plastered, and exterior surfaces are stuccoed. “The walls are to be framed and earthquake-braced internally with lumber,” said Greg Flavall, Hemp Technologies’ co-founder, who added that “hemp is very close in cellulosic value to wood.” The material helps to keep structures warm in winter and cool in summer, he said.
According to the LA Times, the company plans to construct a 500 square-foot hempcrete structure near the remains of Knapp’s Castle near Santa Barbara.
engineers have managed to make a building material out of the plant called Hempcrete out of which a company called Hemp Technologies have constructed two houses in North Carolina.