Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
Cob Yoda's cob houseWill Firstbrook WCB of BC wfirstbr at msmail.wcb.bc.ca
Thu Dec 4 16:40:41 PST 1997
Hi Mike, Thanks for your reply lots of food for thought! >-----Original Message----- >From: cobcrew at sprynet.com [SMTP:cobcrew at sprynet.com] >Sent: Wednesday, December 03, 1997 4:30 PM >To: coblist at deatech.com >Subject: Re: Cob Yoda's cob house >[Will Firstbrook WCB of BC] snip > >[SNIP]Any Ideas on how this could be done? >Cob roofing is our favorite topic. We are planning both a 11' hallway with a >cob >barrel vault and a 15.5' cob dome. For our larger dome, we are thinking of >using >cut Hebel aerated concrete block (very light weight, good insulator, about >3-4x >stronger than the best cob mix we have made.) >[Will Firstbrook WCB of BC] >I have never heard of this stuff, is it widely available and how much does it >cost? Would you use it as tiles? > > Note: we have not found any round windows that are screened and open. >Anyone have any ideas >about round windows where you need ventilation and have lots of mosquitoes? > >[Will Firstbrook WCB of BC] Initially I was thinking of imbedding the glass >into the cob wall. Cheap and easy, but ventilation and fire escape now has me >thinking... One possibility could be to use plywood to frame the window glass >sandwich style, and attach the window with hinges to a plywood not sure of >the right word (frame/sill) that is embedded into the cob wall. A Jigsaw can >shape your desired shape. > >>Three possible techniques come to mind: >>[SNIP] >>3. Maybe the wattle and daub technique of getting lots of sticks tied >>together in the shape of the structure then using them as a form to >>massage the cob into. >This is the one we're going to do. We have a ton of bamboo cut and ready for >use. Might not be available in BC. Hope to use a mesh system, with large >pieces >interspersed with smaller ones. About 4" square, tied with "black wire". >Thinking about 6-8" total thickness. Shape is key - catenary or egg shaped >helps >distribute lateral forces and will help with the snow load. >>[SNIP] >>Yet cob does not make a good roofing material even with a lime finishing >plaster. >Well, what is the difference between all those cob ovens and a small dome? >There are many adobe brick domes world-wide; cob offers some advantages over >adobe brick, I think, in terms of the extra straw component adding to the >tensile strength and fewer cold joints. Carol Crews (sp?) in New Mexico has >a >hybrid cob/adobe structure with an adobe dome roof (not catenary). She has >suggested a special sealant (silica-based) that waterproofs but still allows >water vapor to enter/exit the material. >[Will Firstbrook WCB of BC] >I would like to know more about this "Gore-Tex" like sealant. But this part >of the world is a lot wetter than New Mexico. So I do want a very water proof >roof over the cob. > > >If we run into difficulty, we have >considered covering the cob with: >1) A silo top ($1,500 new from Minnesota). >2) Ceramic tile or synthetic tile or tiles made from recycled tires. > >[Will Firstbrook WCB of BC] Very interesting idea about car tires as >roofing tiles. > >3) A tin roof (best option for rainwater collection) > >[Will Firstbrook WCB of BC] >I am thinking of using roof water for drinking and washing from the main >structure so this seems to be a good option for that part of the roof. >4) Some form of thatching. > >[Will Firstbrook WCB of BC] Seems too expensive at this time. I do want a >creative house but one of our goals is to avoid or minimize any >mortgage/debt. My goal is to simplify life and start doing things that are >important to me rather than to work for a large organization to pay most of >my income to mortgage interests and taxes. > > >Best of luck with your project. We have been getting some of our design >ideas from an adobe book, "Adobe and Rammed Earth Buildings" by Paul McHenry, >Jr. There are several pages on adobe domes and barrel vaults. And hey, if >we have to make some bricks, we'll do it! > >Our details are at http://home.sprynet.com/sprynet/cobcrew >Mike. > >[Will Firstbrook WCB of BC] > >Regards, >Will
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