Rethink Your Life!
Finance, health, lifestyle, environment, philosophy
The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Another inquiry on sealants...Henry Raduazo raduazo at cox.net
Wed Nov 3 17:26:59 PDT 2010
If you have a good roof over a cob structure there is no reason other than esthetic to do anything else to it. If you wall is going to set out in the rain you need to do something and nothing that I have found is perfect. You must also consider the environment that the cob is in. The worst situation is a warm heated house and a cold exterior exposed to water. Here the only thing that I know of is lime finish because it sheds water and permits evaporation of moisture from inside the wall. If both sides of the wall are equal temperature and the same humidity then you can coat the wall with almost any water proofing that you want. My wood shed has an earth plaster roof that is painted with boiled linseed oil to make it waterproof. Linseed oil tends to darken and even turn black over time. There are other penetrating sealers that do not discolor, but they are a bit more expensive. There is still a small leek in one section of my 7 foot by 30 foot roof, but I think I can fix that with another coat of linseed oil. I am also experimenting with driveway sealer. If you did this in a real house you would need a well ventilated attic space that would separate the roof from the living area. Ed On Nov 3, 2010, at 5:06 PM, Benjamin Brownell wrote: > I've done some searching and reading and testing on this question, > but thought I would still check in here for new insights or advice. > I feel like there must be alternatives to the two standard answers > on weather-protecting earthen structures-- > a) just cover it already with proper roofing, or b) give it a > natural finish (oil, lime, etc) but watch closely and plan for upkeep > > I'm curious if people have had success with other treatments, even > 'industrial' versions, that could allow for durable application in > public settings without utterly sacrificing the aesthetic qualities > of the substrate. I believe rammed earth buildings are often sealed > with versions of silane/siloxane that is a semi-breathable > treatment often used on concrete, but have not tried it (nor know > of a tested version for natural plasters). I have seen cob > partially painted with latex to some good effect. There are a > multitude of other more and less frightening compounds available. > Perhaps this is heresy to purists, but I'd like some alternatives > to get mainly sculptural demonstration works into the public eye > and not watch them fall apart with the slightest neglect/overuse. > Not so concerned about breathability in this case, although I think > different treatments for different exposure levels could be > combined for maximum benefit/minimum impact. > Any info, speculation, anecdote is welcome! > > > > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist
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