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Kiko Denzer on Art
[Cob] Foundations for stoves and interior cob wallsAmanda Peck ap615 at hotmail.com
Wed Mar 15 07:58:22 PST 2006
We had an earthquake in the county recently, but they've always been small and rare. This has been true every place I've lived. So I know next to nothing about building in seismic areas (although there could be a "big one" just a little over a hundred miles away). And I'm not an engineer. But if I'd thought about it at all, I'd have thought that for frost heave and the like, an 8-foot deep perimeter foundation (are you insulating and waterproofing or draining the outside, by the way?--and how much extra would a basement be?) would keep the earth under the building the equivalent of Tennessee near the Alabama-Mississippi line. So an 18" deep foundation/footing for an interior hearth would work just fine. Footing several inches thick, come up out of the ground with concrete block or concrete or mortared urbanite (with or without lines of rebar or barbed wire embedded in the mortar) and a rubble fill, probably something like that heavy roll fencing they embed in concrete to keep it from making a sinkhole. I may not do that much, although for a heavy building--e.g. cob--I expect that I will have to do a real, down-to-frost-line footing for the building foundation, and that will require a lot of earth moving in general. So if I want the stove built on undisturbed earth (good idea) I may have to do a standard foundation for it (and around here, that's about what I just described). ............. Anna wrote: A question about stove and interior cob wall foundations. We are doing the formwork for our cob/strawbale house concrete bond beam at present (thanks to living in an earthquake zone). The plans specify the same 2-3' wide, 8' deep footing for an interior cob wall and masonry/woodstove stove as for the main outside walls. This is a lot more cement and feels like overkill to us. However, if we do a stone or urbanite foundation starting higher up, above the waterproofing barrier, it will be on a lot of infill earth. Well-tamped, but it might settle over the years. Any thoughts / comments / experience?
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