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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] strength of cob archesPredrag Cvetkovic predragcv at ptt.yu
Wed Jul 16 03:12:29 CDT 2008
My friend and me wanted to build a small round garden building about 3m in diameter in his yard in our small town- primarily to gain some building experience and then to have some space for sitting. But later, to avoid possible problems with building codes, we decided to modify the idea of building to be only with holes for doors and windows: we will not build doors and windows in. Maybe during winter we could put some protective covers on holes and because there will be a hearth, it could be possible to sit inside. A small model (1:10 ratio) pictures explain better then words, you can see it at my friends link: http://picasaweb.google.com/miodrag1963/Cob We think of a stone foundation and stone arch for the front door. And a gentle slope reciprotial live - green roof with a thin layer or earth (up to 5cm). So, finally, our question is: are cob arches enough strong to bear the roof in our garden house? Should we use wooden pillars as a support (from the foundation to upper wooden beams)? We will put these upper beams on the wall, to bear the roof, but in the case of round building shape it is more difficult to do that then with rectangular one. Or maybe to put few wooden posts inside the wall? We could build thick cob walls (about 30cm) but would it be enough strong because in a big part of a building we will have only cob arches and cob pillars instead of cob wall? Hope that my question was clear enough. Any comment and suggestion are welcome. Predrag