Building a cob oven · Living Earth Structures

Building a cob oven

I was working on building a Cob Oven today here in Oregon at the Cob Cottage Company and thought I would share with you the process. I mentioned the insulation…It’s also possible to make an insulation mixture with Clay and lots of straw packed tightly or lover rock mixed with Clay, or sawdust mixed with Clayif you don’t have access to perlite. I like using the pear light though because it forms together into a ball and stays pretty compact when putting it over the thermal mass layer. We will probably take out the sand mold tomorrow and get a few little fires going in the oven to dry it out before putting the insulation layer on. It’s very important to make a very dense cob mix of up to 80% Sand 20 % with not very much water so that it forms together into a ball and won’t slump when putting it on the oven this will also help to keep the oven from cracking. If your Oven does crack though, when you fire it up, don’t be too alarmed. it can easily be patched up.. It does help in the curing process to have the Oven dry slowly so small little curing fires are better than big raging fires for the curing process.

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Building a cob oven