Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] RE: Susan's foundationAmanda Peck ap615 at hotmail.com
Tue Jan 11 09:21:02 PST 2005
The straw bale people seem to have settled on bamboo as reinforcement to hold the walls TOGETHER, not necessarily to the foundation. That's a neat solution. Flexible, strong, even the same plant family. Might work for cob as well (both have straw), but decidedly not with what any of us use as a (lower) bond beam or foundation. It may be too much of a screaming pain to use bamboo horizontally (or vertically) in cob, though. My first thought was stalagtites/mites for cob-foundation tying. Too brittle, not renewable enough. But surely some sort of ceramic could be formulated--flexible, as such things go, with all kinds of little barbs to hold into cob and concrete. High tech and really expensive if an existing material isn't suitable. ............. Barbara wrote (snipped): That being said, those of us in seismic zones still need a means of tying the top plate and roof-bearing assembly to the foundation, and at this point, the best solution I've seen is rebar, though it's far from perfect. The cob will still fall away from the rebar, unlike concrete, but perhaps enough of it will stay together that you'll remain safe or have time to get out of the building. Until we have more seismic testing, as has been done with straw bale, we just don't know enough about how cob will behave in various types of earthquakes for me to feel safe with cob alone. As a component in a hybrid system, yes. ......We'd love to hear from anyone with better solutions. John Fordice has spoken at some length about the need to tie the plate and the foundation together, and about his reservations about combining cob and other methods/materials (dissimilar properties, unpredictable results).
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