What is the history of Hemp in Hawai’i?
Rep. Cynthia Thielen was Hawaii’s leading industrial hemp advocate in the state legislature. In 1999, Hawai’i was the first state in 50 years to authorize growing industrial hemp again. In 2014, Thielen co-sponsored the Industrial Hemp Act of 2014 and helped establish the industrial hemp project at the University of Hawaii. Read more HERE.
What is hempcrete?
Hempcrete is a bio-composite material made from hemp hurds (the inner woody core of the hemp plant), lime, and water.
How is hempcrete made?
Hempcrete is made by mixing hemp hurds with a lime-based binder and water. The mixture is then cast into molds to form blocks or used as insulation in construction.
How is hempcrete different from traditional concrete?
Unlike traditional concrete, hempcrete is not used for structural support. It acts as an insulating material and has different properties, such as being lightweight, breathable, and more environmentally friendly.
How long do Hemp Homes last?
Hempcrete homes are long lasting. The average home is estimated to last 50 to 100 years.
What are some of the benefits of building with hempcrete?
Sustainability: Hempcrete is an eco-friendly alternative to traditional construction materials. Hemp plants used in its production absorb carbon dioxide (CO2) during their growth, making it a carbon-negative material.
Thermal Performance: Hempcrete provides excellent thermal insulation, which is particularly beneficial in Hawaii's tropical climate. It helps regulate interior temperatures by minimizing heat transfer, reducing the need for excessive air conditioning and lowering energy consumption.
Moisture Regulation: Hawaii's high humidity levels can lead to moisture-related issues in buildings (ie. mold). Hempcrete has hygroscopic properties, meaning it can absorb and release moisture, helping to maintain balanced humidity levels indoors. This feature can contribute to improved indoor air quality and prevent the growth of mold and mildew.
Fire Resistance: Hempcrete has inherent fire-resistant properties, making it a safer option for construction. It does not release toxic fumes when exposed to fire, reducing potential hazards and enhancing overall building safety.
Durability and Structural Integrity: Hempcrete has good durability and can withstand structural movements caused by earthquakes and settling. It forms a solid, breathable wall that allows moisture to escape, minimizing the risk of damage from moisture-related issues. It's worth noting that while hempcrete offers numerous benefits, it may have limitations regarding load-bearing capacity and specific construction requirements. Therefore, it is essential to consult with professionals like Hawaii Hemp Home, to ensure its successful implementation in construction projects.
Pest and Rot Resistance: Hempcrete is naturally resistant to pests, such as termites, and rot, making it a viable choice for Hawaii's climate, where these issues can be prevalent.
Lightweight: Hempcrete is a lightweight material, which simplifies construction processes and reduces the overall weight on the foundation and structural elements of a building.
Carbon Sequestration: Hempcrete sequesters carbon dioxide from the atmosphere during the growth of hemp plants, and this carbon remains locked within the material even after construction.
What are the costs associated with building with hempcrete?
Hempcrete is competitively priced to a conventionally built home and its long-term energy savings and exceptional durability can significantly offset the initial investment.