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Hi Less, I made my oven with the traditional way that people here in Colombia make the wood fired ovens, a mixture of mud and straw, I didn't insulate it, so when I fire the oven I can feel the heat on the outer walls of the oven, it doesn't get very hot, it feels warm. I finished the oven covering it with thin firebricks (those that are used for the oven floor).
Here there's a waterproof paint used for buildings, but some of them are flamable, so I still don't know what to do....
Since you built your oven like the locals do, "in the traditional way" what is the traditional way to waterproof a WFO made of mud and straw in Columbia?
I'm not trying to be smart, just what you are describing is something akin to what I know as a "cob oven" and I have never seen a cob oven that is painted as a means of waterproofing. The two cob ovens I have experience with are usually under cover of a tarp (with lots of venting so the tarp doesn't trap moisture) when not in use. I have seen photos of them built under a protective roof type structure as well.
It will be interesting to see what you end up doing. Please keep us posted.
I'm not sure it will handle the heat - this is an uninsulated oven. I checked the spec of the Dryvit I used. All they say is that they passed the ASTM E 84 test. I don't have access to that spec so no clue how hot it got.