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Hempcrete FAQ

What is hempcrete?

The main components of hempcrete are industrial hemp hurds (core), a lime binder, and water.

Where do I find lime binders? 

Hemp hurds will need to be mixed with a lime binder. We do not sell lime binders. Example suppliers are LimeWorks Ecologic and TransMineral USA's Batichanvre.*

Should I take any protective measures when using hempcrete?

Protective goggles, gloves, masks, and other necessary PPE should be worn when mixing hempcrete, because hydrated lime is caustic. 

Can I use hempcrete in the foundation of my building like concrete?

No, hempcrete cannot be used as the foundation for a structure.

If I use hempcrete for my walls, how does this change the materials used to construct the walls?

Hempcrete creates a monolithic structure, which acts as your OSB, insulation, and drywall. No cavity is necessary, but framing is still required.

Can hempcrete be used as a structural material? 

Hempcrete is a non-structural material which is cast around a timber, steel, or concrete frame. 

Does hempcrete require a permit? 

Hempcrete does not yet have a certification/standard from the International Code Council (ICC) or the American Society for Testing and Materials (ASTM), so local building officials must be informed on a case-by-case basis. Although hempcrete has received approval by the British Board of Agrement, this certification does not help with the permitting process in the United States of America (USA).