Did you know that cob is one of the oldest building materials around? According to my guest, Dave Olsen, most cob houses are tiny houses because they take so long to build! Cob is a mixture of clay, sand, straw, and water that hardens into a thick, load-bearing, structure. Think curved, earthen walls and whimsical building shapes. Dave Olsen has been building with cob for over 20 years and has developed his own technique, called “Fast Cob”. Dave tells us about the benefits of Cob building, how to do fast cob, and more.