Hemp structures date back to Roman times. But now, some builders want to bring it back to their markets, since it’s known for being a fast-growing, sustainable product.
“Mixing hemp’s woody fibers with lime produces a natural, light concrete that retains thermal mass and is highly insulating,” The New York Times reports. “No pests, no mold, good acoustics, low humidity, no pesticide. It grows from seed to harvest in about four months.”
To clarify, industrial hemp is not the same as the product that can give you a buzz. It contains only 0.3 percent of the substance THC, or tetrahydrocannabinol.
Hemp is more widely used across the globe as insulation to fill walls and roofs and under floors in wood-framed buildings. It becomes stucco-like in appearance, it’s more like drywall than concrete so it can’t be used for a foundation.
Source: “High Times Beckon for Using Hemp to Build Houses,” The New York Times (Jan. 29, 2018)