Hemp-lime composites for building insulation.
Hempcrete is a composite made with hemp hurd and lime binder. It comes in two forms: cast in place and in premade blocks. It is a biocomposite building system that is used primarily for thermal envelope applications.
Currently operating in the USA
The product is sold online by the manufacturer
6” hempcrete insulation blocks: 9.20 USD/ft2
Building grade hemp hurd: 0.75 USD/lb
Limestrong hemp binder 0.70 USD/lb
Other building blocks such as: Wriks, Replast, Watershed blocks.
Goal 11: Make cities and human settlements inclusive, safe, resilient, and sustainable.
The product can be installed by casting in place using molds or as pre-cured blocks. The company is building a manufacturing facility in Jerome, Idaho (USA) that will be completed in 2022
Hempcrete is a registered trademark
Users can obtain the product by purchasing online
Size of the component
List of primary materials in the component
List of secondary materials in the component
Measurement, calculated in hours, of the component’s resistance to fire
R value associated with material/product
The compressive strength of the component, measured in megapascals
List of suitable climates for use of this components
Hempcrete can be built in two forms: cast in place or purchased in blocks. Cast in place is an installation technique that involves using form boards and packing the Hempcrete in between form boards to create walls. Hempcrete blocks are a pre-cured solution for building insulation.
Hempcrete is a monolithic wall system that is best used as a thermal envelope for energy efficient building projects. It can be used for both renovations and new buildings.
Plant-based resource: Hempcrete is made with a renewable plant-based commodity, the hemps’ “Hurd” that is typically considered a waste product.
Carbon sequestration: Hemp absorbs CO2 during its growth. After mixing the hurd with the binder, CO2 is absorbed during the solidification process. 1 ft3 of hempcrete building material offsets approx- imately 7.27 lbeq of CO2.
Insulation: Cast in place 10” thick hempcrete presents R2.5/inch.
Moisture: It is capable of being exposed to humidity while maintaining their R value.
Sounds: Hempcrete attenuates sound transmission.
Intertek performed a fire test following ASTME 84. The hempcrete specimen obtained a 0 for flame spread and smoke development, on a scale from 0 to 450, making it fireproof
Potential hazards related to breathing powder dust of Limestrong (the products’ binder).
The manufacturer also sells mixer machines to prepare Hempcrete.
Hempcrete was tested for flame and smoke.
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