Insulation Alternative: Hempcrete

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Insulation Alternative: Hempcrete

Creating locally sourced lime and clay binders for use in hempcrete.
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Hempcrete

Green Builder Media

Thursday, June 9, 2016 - 7:30am

CAMPAIGN: Building Science

CONTENT: Blog

Hempcrete (a mix of chopped hemp hurd and a lime-based binder) is a relative newcomer to the North American insulation market, and most of the R&D and testing work to date has been done in Europe using proprietary formulations from the companies that pioneered the material for commercial use. This has been great for the development of hempcrete use on an ever-growing array of European projects, but the dependency on imported materials has made the use of hempcrete in North America prohibitively expensive for most.

At the Endeavour Centre, we have developed the use of locally-sourced binders for hempcrete, and paired that with hemp hurd sourced in Canada. At this point, our homemade hydraulic lime binder is well-tested and we feel it works as well as the imported binders, at a fraction of the cost.

Hempcrete mix Our hempcrete binder is composed of 50% hydrated lime (we use Graymont’s Ivory Finish Lime) and 50% Metapor metakaolin from Poraver (created as a by-product of the company’s expanded glass bead production). The metakaolin causes the lime to have a partially hydraulic set, speeding up hardening time and promoting faster drying of the material.

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Keywords: Energy | Chris Magwood | Energy | Energy Efficiency | Environment | Green Builder Media | Utilities | hempcrete | insulation alternatives

CAMPAIGN: Building Science

CONTENT: Blog

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