Rethink Your Life!
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The Work of Art and The Art of Work
Kiko Denzer on Art
[Cob] cob oven problem?Monica Proulx mon.pro at gmail.com
Tue Oct 4 18:11:35 PDT 2005
Hi, Looking for an answer about a cobbed oven project. I am new to cobbing and the list and have searched the list but not found an answer to my question: Does an outdoor cobbed oven take in air for combustion through the floor between the fire bricks during the baking cycle once the door is closed? My son and I have dug a two foot deep hole (by four feet round) and I dumped most of a donated batch of 7 (5 gal) buckets of broken cement rubble into the bottom, before I discovered that it had the unmistakable odor of cat urine. It had been sitting in the buckets for some time and I guess the smell had gone dispersed somewhat from stuff on top of the buckets, and only when I dumped did I smell it. Ugh! [I should have asked them why they were busting up their basement floor, I thought they were putting in a bath or burying a body, who would have thought of cat urine : ( ]. Since I didn't have a place myself to dispose of the rubble and didn't want to return it, I left it in place and then we put clean rebble on top and built a third of our urbanite foundation. It is mortared on the outside ring (to prevent mice, which we have by the hatful). Anyone have an idea how to seal off the foundation, or do I even need to seal it off?. We have a couple more feet of foundation to build up, and since I was planning on continuing to mortar the outside perimeter that may mean that any draw of air up though the bricks (if there is any) will come straight up from the bottom of my foundation where the "treasure" is buried. This potential problem didn't occur to me til some days after the deed was done, and I am now worried that cat urine odor (which has a half life of several hundred years!) will come up into my oven. Anyone who has smelled a hot home radiator with cat spray on it knows how intense that can get. If I put a cob layer in the foundation would that be air proof enough, given that cob breaths? Should I use plastic (am worried that will melt) or cement for a vapor barrier? I have a sick forboding about this that is tough to shake, and hope that I am worrying about nothing. I wish I had thought of this sooner and I would have removed the stuff. We live a block from a river on a sandy silty soil with a high water table and lots of rising damp and humidity, which often magnifies smells. We were hoping to build the actual oven this weekend or next, so if anyone has any suggestions before then, that would be great. If not, that's ok too. Thanks, Monica
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