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Clay is a versatile building material used to create beautiful and durable structures for thousands of years.  Clay can be formed into building blocks (such as adobe) or monolithic walls (such as rammed earth or cob).  Cob combines clay, sand, and chopped straw to create beautiful & durable walls with high thermal mass.  Sand provides strength and resistance to cracking; straw provides tensile strength, and clay binds all ingredients together.  Sculpted cob thermal mass walls can store the sun's heat energy in passive solar design or can provide thermal storage for a masonry heater.

• overview of cob construction, including description of ingredients, testing soils for clay content, and mixing techniques

• guided hands-on experience mixing cob and building a wall, including how to create niches

Down to Earth Design, inc.
Sigi Koko, principal
215.540.2694 PA
202.302.3055 DC
admin@buildnaturally.com

©2000 Sigi Koko & Down to Earth