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[Cob] cob re wall building problemsMarlin lightearth at onebox.comFri Jul 30 09:57:58 CDT 2004
We sure don't have that problem here in (this year) rainy Wisconsin, but to keep the lime plaster moist we used coffee bean bags (burlap) filled with straw that had been wet and then set on or against the wall, then a tightly pinned plastic. The straw/burlap bags acted as the humidifier and the plastic (not clear I guess) kept the moisture in,,,,,,for us it can cause rot it's so humid but probably not in Deming! I've never worked with clay that wouldn't rehydrate with soaking water and then we always add slip on to the holey cob before starting..... Marlin p.s. we definately benefitted from leaving holes in the top and sides of the Cob for securing future layers to and they held water (sometimes we didn't want them to). -----Original Message----- From: Amanda Peck <ap615 at hotmail.com> Sent: Fri, 30 Jul 2004 09:09:03 -0500 To: coblist at deatech.com Subject: [Cob] cob re wall building problems Three things come to mind--one, you've already tried--plastic over the wall, although you might try fastening it pretty closely. two--I would expect pure clay that's been compacted to be almost waterproof--hold water long enough between rains to grow a nice crop of tadpoles to maturity. We might have 40-some inches of rain in a year. My "floor test" of sand/clay/woodchips once it dried sat outside in a paint roller tray for a year with no visible deterioration. We did the floor with more sand, because it had shrunk quite a bit. Question--is your mix CRACKING--or trying to--given that the straw is holding it together? It doesn't surprise me that it doesn't wet back up to cob stage nicely. I wonder if the more experienced people on the list think that your clay/sand mixture is OK. Also wonder if some wet sawdust in there might slow your drying time down. DON'T take my word for this, you need the voice of experience here! I'd feel confident in adding sawdust to a floor, but would need another opinion on a wall. Slip--creamy water/clay mix--would probably work better than water for a base with which to put the next layer on. Once again, expert opinion welcome. three: an acquaintance back in the seventies was a "farmer"--I can't remember whether his crop was sprouts or mushrooms, but something that he could grow under a roof, not much light. The problem, he said, was that there seemed to be about a three-hour window where the stuff was ready for harvest. Might be time for cobbing parties so that you can take advantage of that short window when it's just right to put the next layer on. Either that or do what he did and work more-or-less around the clock, napping in the slack times. He changed professions quite rapidly. In my part of the country "crusher fines" are called "crusher run." Other areas seem to go with "roadbase." ............ Mark Thomas writes: Attempting to build a small cob building on my property south of Deming. The cob dries fast in the dry, hot and often windy weather. I have not been able to work the next layer into the previous while it is still plastic yet firm enough for support. Tried covering with tarps and placing wet hay on the wall. Re-wetting the wall is difficult. The semi-dried cob does not seem to accept water and soften up. Have tried leaving holes in the top of the wall to be filled with water. Maybe it is the expansive, montmorillinite clay? Any cobbers out here? Any suggestions? One good discovery. Crusher fines from the local gravel pit (about 3/8 minus). Cheap and a good additive to high clay soil that contains lots of fine dune sand. _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ _______________________________________________ Coblist mailing list Coblist at deatech.com http://www.deatech.com/mailman/listinfo/coblist
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