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[Cob] Urea as Binder in Cob (long post)Shody Ryon qi4u at yahoo.com
Sat Oct 20 10:02:56 PDT 2007
Hi Mahavir, This sounds like a wonderful project. I have not built a cob house. I do not think it is generally safe to build a drywall foundation, if by drywall you mean gypsum board, which is usually used in fairly dry non structural applications and interior location. I have seen it used on what looked like the exterior of a commercial building during construction. It may have been eventually covered with something and it was installed under a big overhang. It was the green kind of drywall that was used in slightly wetter locations such as bathrooms and kitchen interiors. The latest that I have heard about drywall is the use of paperless drywall that is likely less toxic than I assume the papered drywall is. I do not understand how a foundation would be made from drywall, would it be several gypsum board sandwiched together until a 6 or 8 wall is formed? What is commonly done is concrete rubble is put into a foundation trench, if I understand correctly. I imagine that you could use rock rubble if that is more plentiful in your area. Do you have access to a lot of drywall? As I recall, I have heard that the common weed purslane has urea in it that might be able to be used as a fertilizer. Purslane is almost like a succulent plant and I have seen local (to southern California) succulent plant leaves put in a trash can with water to make what the builder called musulage (unknown spelling). He let it soak as long as possible, days or longer and used that to mix with the earth. I would consider making the walls think and low and thinner as the wall increases in highth and the use of a beam in the top of the wall, if I were doing it. I would also make test samples of earthen bricks to see how strong they are with different mixes and what happenes to them when they dry. Cheers, Shody --- Mahavir Mahedu <lonthia at yahoo.co.in> wrote: > Hi everybody, > > I am planning to build a cob house with thatched > roof in India. <snip> __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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