Hemp Build Podcast Ep. 8: Navigating the New Hempcrete Building Codes with Tim Callahan (IRC Appendix BL)

sustainable constructionBuilding regulationsInnovationEco tourismTrade ShowsConferencesRenovationResearchEventPodcast

Feb 15

By Hemp Build School

The Hemp Build Podcast Ep. 8 presents an interview with hempcrete designer/builder Tim Callahan, co-author of the IRC Appendix BL, Hemp-lime Construction (Hempcrete) discussing

The series spotlights leaders in the hemp building industry and is tailored to architects seeking continuing education (CE) credits.

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Americhanvre

South Bend Industrial Hemp

Hillside Center for Sustainable Living

Sativa Building Systems

Silacote Mineral Paints

Earthaus Plaster

HempWood

Evolve Construction

Tim, a co-author of Appendix BL and a pioneer in the US hemp building movement, shares over 30 years of design-build experience. We take a deep dive into the technical evolution of hempcrete—from the high-labor "NauHouse" prototype in 2008 to the standardized, code-approved wall assemblies used today.

Homeland Hempcrete

Verdant Structural Engineers

Right Coast Hemp

Kanda Hemp Seeds

In this episode, you’ll learn:

The Four Approved Wall Assemblies: Understanding interior, center, exterior, and double-stud configurations under Appendix BL .

Fire & Safety Standards: How hempcrete achieved a 1-hour fire rating (ASTM E119) and its zero flame-spread index .

Building Science: Why "breathability" (vapor permeability) is essential and why you should NEVER use a vapor barrier with hemp-lime.

Code Adoption: How to work with local building officials and navigate the "snowball effect" of national code adoption.

Healthy Hemp Homes

Riverdale Hemp Gin

Victura Hemp

Prairie Band Ag

Whether you are an architect, builder, or sustainable living enthusiast, this episode provides the technical roadmap for bringing hemp-lime into mainstream construction.

Aaron Grail Construction

IND HEMP

HempBLOCK USA

Next Genesis Design

“Architects are looking to renew their continuing ed credits, and we want to give them something in a new format new to acquire their credits,” said Kaderli.

Boardwurks Biocomposites

Renewabuild

East Coast Hemp Supply

Hempitecture

Root Down Designs

Crown Jade Design & Engineering

E3 Agriculture

Magic Minerals

If you are an architect seeking CE credits, please enter your information here: https://hempbuild-community.circle.so/c/aia-continuing-education-courses/