Hempcrete is a thermal and acoustic insulating wall material suitable for both external and internal applications. It can also be used for both roof and floor insulations. It is more commonly used for residential projects however there have been many successful commercial projects completed overseas.
Industrial hemp (from Old English hænep) is a variety of the Cannabis sativa plant species that is grown specifically for a range of commercial purposes including paper, fabric, clothing, biodegradable plastics, paint, insulation, biofuel, food, and animal feed. Hemp has the ability to absorb substantial levels of carbon dioxide during its rapid growing cycle. When you build with hemp, you are actively capturing and storing carbon for the life of your building.
Hemp displays extraordinary thermal performance. It has the ability to both insulate and store heat, providing you with a more comfortable and constant internal temperature. Combined with a lime or clay plaster finish to internal surfaces, hemp-lime provides a passive means of regulating relative humidity thereby reducing your reliance on mechanical heating, cooling and ventilation.
Numerous studies suggest the level of toxins inside a typical conventional home can be greater than that of outdoor air. Hemp-lime contains no harmful chemicals and will not 'off-gas' over time. Hemp-lime is entirely compatible with non-toxic natural plant-based oil finishes, lime washes and renders. Hemp's natural ability to control interior humidity levels helps to eliminate the incidence of toxic mould growth.
Building with hemp-lime means safer buildings. This provides outstanding fire ratings.
Hempcrete does not rot and is pest-resistant, thereby reducing the need for treatment with potentially harmful chemicals.
Information last verified: 1st May 2018