Okay, question... http://homepage.psy.utexas.edu/homepage/staff/Zuker/StrawHouse/Handout%201996.pdf (this link is pdf) If you use forms and make a straight wall, would you not need buttresses? Why or why not? How do some of the older homes (seen photos) in say, England of Australia, made with cob, have straight walls and no buttresses? jilly