Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Exterior insulationraduazo at cox.net raduazo at cox.net
Mon Dec 24 13:30:21 PST 2007
Jesse, Ianto is now using a system where he adds two strings to a two string bale, then chainsaws the bales apart to form two thin bales which he uses as a support surface for building cob. I have pictures, but I am no home so I can't send them. I am planning on trying a paper/clay system this summer or as soon as the weather gets a little warmer. I will start by soaking bundles of newspaper in a pit for a week or two and then rototilling them into pulp and adding a little clay with my cheap front tine tiller. I will then attempt to build up a 4 inch thick layer of paper/clay on an existing cob wall, possibly using dead-man strips imbedded in the paper/clay. The paper/clay will then be given a color finish of some sort perhaps lime putty or a colored paper/clay. I am very fond of a red clay from a friends farm in VA. Ed ---- Leslie Moyer <Unschooler at atlasok.com> wrote: > > > jwellman at jwgeo.com wrote: > > > > On a different note, what ideas have people considered for > > exterior-to-COB insulation? > > > > > Jesse, > > I've proposed rockwool (a.k.a. mineral wool), but I know of no one who > has used it and I haven't tried it yet. Rockwool is made of mineral > slag (a waste product of the coal-burning power plant industry) and > sometimes some added basalt, depending upon the composition of the slag. > It is vapor permeable. You can get a high R-value in a fairly thin > thickness and my thought is that it could be applied to a cob wall and > then plastered over. I can imagine dipping it in slip, covering both > sides, and then "sticking" it to the exterior, finishing with a final > plaster on the exterior. But that's all speculation--I haven't even > seen any actual rockwool yet! > > There are various forms of it....I'm wondering about a semi-rigid sheet. > There is a form that comes in fiberglass-like batts, but breathing > particles can be dangerous and I can't imagine a way to adhere the batts > (they're too flimsy). I don't know how flexible the sheets are....I've > read that they can conform to curves, but I don't know how tight a curve > they could handle. Some brands of rockwool contain formaldehyde, but > others don't and are completely inert. > > I've encountered some snobbery about using a manmade material with cob, > but it hasn't squelched my interest in it. In many temperate & colder > climates (including most of the US) the embodied energy in insulation > can very rapidly offset the energy used to heat or cool a building--and > will continue to provide benefit over the life of the building. And > rockwool is mostly (if not totally) a waste product. > > Many different things can be added to a wall cavity to increase > insulation--basically building a double-wall--but it sounds like so much > extra work & time. > > Volcanic pumice can be added as an additive to cob, but for much of the > world (including where I live) this wouldn't be locally available. > > I've read about rice hulls in cavity insulation, but does anyone know if > it can be used as an additive? Rice hulls aren't locally available to > most places either, but I think I can find a source within a couple > hours from here. > > --Leslie > > > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist
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