Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] plastic jugs in walls?john fordice otherfish at comcast.net
Thu Dec 10 19:27:29 PST 2009
Ed, Based on historic seismic survival of adobe buildings, and some research that was also done for adobe, a wall height to thickness ratio of 7 to 1 has good seismic survival capacity. In the absence of similar tested data for cob, I use this ratio when designing and building cob walls. At 7" thick, this would give a height limit of 7x7 = 49". What is the height of the walls you are describing? john fordice On Dec 10, 2009, at 7:16 PM, Henry Raduazo wrote: > If you are making good quality cob the wall can be as thin as 7 > inches. At cob cottage in Coquille they have been retying bales of > straw and chain sawing them half. The half bales are stuck in the > wall and this results in an insulation layer on the outside of 7 > inch thick cob walls. It saves tones of cob. > I just finished putting a cob wall on top of two cinderblock > retaining walls 7.5 inches thick. Two 7 inch thick cob walls > support 12 foot living roof 50 pounds per square foot. They are > short cob walls with a good overhang so I expect no trouble > supporting the weight. > Ed > On Dec 10, 2009, at 2:46 PM, john fordice wrote: > >> Tys, >> I'll venture to say (without really being able to prove it) that >> it will weaken the wall. A cob wall gets it strength by being >> thick. A structure resists forces acting on it by being made as >> continuous as possible. Making a void in the wall will create a >> weak spot which compromises the continuity of the structure. I >> would not do anything which creates voids in the cob based on this >> reasoning. >> john fordice >> >> On Dec 10, 2009, at 10:07 AM, Tys Sniffen wrote: >> >>> So, as my walls get up over 7 feet high, I'm starting to remember >>> how lower >>> down, when I had them laying around, I would toss in the >>> occasional urbanite >>> chunk to take up some space. >>> >>> Now I'm starting to think about tossing in some one gallon >>> plastic jugs >>> (vinegar jugs, that are slightly thicker plastic than the common >>> 1 gal milk >>> jug) again, to take up space, but also I'm thinking having a void >>> in the >>> wall that size could insulation in a way, and, of course, would >>> make my tall >>> parts a bit lighter. >>> >>> Does that sound like a bad idea to anyone? >>> >>> Tys >>> >>> >>> >>> >>> _______________________________________________ >>> Coblist mailing list >>> Coblist at deatech.com >>> http://www.deatech.com/mailman/listinfo/coblist >> >> >> _______________________________________________ >> Coblist mailing list >> Coblist at deatech.com >> http://www.deatech.com/mailman/listinfo/coblist >
Solar powered hosting (from our cob office building) provided by: DeaTech Research Inc. using Debian Linux based servers. We highly recommend, use, and provide support services for Debian Linux.
If you should have any problems with this page or website, please send email describing the problem(s) to: firstname.lastname@example.org
Last Modified: Friday, 11-Dec-2009 16:13:21 PST
If you wish to be permanently blocked from ever being able to send email to this domain, send your SPAM messages to: email@example.com