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[Cob] smoothing wall in preparation for plasterShannon Dealy dealy at deatech.com
Mon Aug 4 12:34:14 PDT 2008
On Mon, 4 Aug 2008, Bob Smolen wrote: > I put up my first cob wall. It is infill for a timberframe structure I > built. It is 8 in thick and has dried for a little over 1 week. The > surface is very rough because I was rushing to beat rain when I put up > the wall. Is it possible to go back with a strawless mixture of cob to > smooth over rough spots? > I tried doing a little and am wondering if 1/8 to 1'' "after plaster " [snip] A one inch variation in the surface is not that big a deal other than being more work to smooth out during finishing than it would have been to correct while making the wall. The high points can still be trimmed using a machette or (if it is not to hard) a cob saw. I wouldn't use a strawless mixture to "smooth over the rough spots" as you will want a surface that has better strength/integrity to put your finishing coats on. Instead, make a cob mix for coarse plaster work, essentially the same mix as you used for building the walls only somewhat finer and more consistent ingredients. I would run the sand/clay through a 1/4" mesh screen, and use shorter straw. Bales these days tend to have alot of short straw in them so I just run my cob straw over a 1/2" mesh screen before using it regular mixes, this leaves me with lots of short straw for plastering (a fair bit of it will be longer than 1/2" which is just fine for a rough plaster). When applying, you can probably fill in small areas that need 1" in a single pass, but larger areas will need to be done in two or three coats to build it up. For greater strength / stronger binding, I often add 10 to 15 percent lime putty my base plaster mixes as well. FWIW. Shannon C. Dealy | DeaTech Research Inc. dealy at deatech.com | - Custom Software Development - Phone: (800) 467-5820 | - Natural Building Instruction - or: (541) 929-4089 | www.deatech.com
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