Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] Re: cob stoves & light strawBarbara Roemer and Glenn Miller roemiller at infostations.net
Sun Feb 22 14:34:44 PST 2004
Brad, My cob oven gets over 700 degrees which is enough to harden but not quite vitrify my clay. Keeping in mind that clay bodies' vitrification temps differ, and that my red clay is pretty low fire, I'd say the inside of any oven is likely to be less than fired. Your second question is harder to answer, and Amanda's reservations are in order. The Fox Maple post echoes what Robert LaPorte of Econest says, but when I posted that info on the SB listserv with a query about it (seemed way too high to me), folks reminded me of the very low R value of earth, the extremely variable density of light straw/clay with the mix often varied depending on whether the cobber wants more mass or more insulation, the variability in compaction, and the unknown R value of interior and exterior plasters, and concluded that the R value of a 12" light straw clay wall is more likely to be half of what's claimed. Having been in several light straw clay buildings which were very comfortable in our climate with its ~ 5000 degree days, both heating and cooling, I think the R value of such a wall is as complicated to figure as that of a log wall. That is, the system seems to function much better than simply adding the elements would produce. Barbara in the Sierra Nevada Foothills
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