In this episode of the Hemp Build Podcast, host Ray Kaderli is joined by Tim Callahan of Callahan Home Designs to discuss the landmark inclusion of hemp-lime (hempcrete) into the International Residential Code (IRC).

A group of natural building code experts and building pros submitted updates this summer to the US residential model codes that will make it cheaper and simpler to build with hemp-lime (“hempcrete”). An online fundraiser seeks to raise $12,000 to fund the updates to the 2027 International Residential Code (IRC) that will include ASTM tested 1-hour fire-resistance rated walls.

Architects, builders and hemp homeowner hopefuls gathered in Austin July 11 at a landmark event celebrating the city’s formal adoption of hemp-lime construction (commonly known as “hempcrete”) into its residential building codes.

A new book of architectural details for hemp-lime construction will be published in May, written by a pioneering US hempcrete builder who helped co-author the hemp-lime appendix published for the first time in the 2024 International Residential Codes.

We’re sticking out our neck at HempBuild Mag and trying to predict what will happen in the wonderful and confusing hemp building industry  in the new year.

New architectural plans for three hempcrete ADU designs were released this week by a Carolinas-based team who say their multi-year experience designing and building hemp-lime homes can boost success for those who want to build with hempcrete.

“Beyond my wildest dreams,” is how Cameron McIntosh described the fruits of his decision with his wife three years ago to license and distribute the French EREASY spray-applied hemp-lime application system. 

After years of efforts from USHBA volunteers and consultants, the governing body for national building codes in the United States released a residential building code that included hemp-lime (hempcrete) for the first time.