Natural materials builders seeking to grow a market for industrial hemp in the United States are moving forward after successful testing for building safety codes and recognition by a national architecture and design program at a U.S. university.

Hemp advocates have identified lime-hemp building material, called "hempcrete," as an opportunity to build a market for hemp grown for fiber.

Challenges have been a lack of supply, building code regulations and a lack of education among architects and designers, builders say.

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Jean Lotus ~ UPI.com ~