I’ve been aware of the value of what is called “hempcrete,” a mixture of lime and hemp hurds (an agricultural byproduct), for several years. But I’ve never learned much about how to prepare it, partly because industrial hemp cultivation has been illegal in the United States for the last eight decades, since it is related to the type of Cannabis famous as marijuana.
Then a few days ago I was asked to write an endorsement for the cover of a book about to be published by New Society Publishing and written by Chris Magwood, about hempcrete. This is what I wrote:
Chris Magwood has combined his deep understanding of building science with some fortuitous hands-on experience of working with hempcrete to craft this timely and detailed guide to the essentials of hempcrete construction. By simply mixing the lightweight core of hemp stalks (an agricultural byproduct) with lime it is possible to make an insulating material that can handle moisture without decomposing, has good structural qualities and thermal performance, is nontoxic and fire resistant, naturally sequesters carbon, and is ultimately completely recyclable. With the successful use of hempcrete in Europe for over a decade, hopefully this book will help usher in a new era of industrial hemp production in North America.
If you would like to find out more about this obviously useful product, here is a link to very detailed article about it: www.thcint.com and when the book is eventually published I can heartily recommend it.