What's a sumo picture have to do with a woodfired oven?
Well, note how the sumo ring is built. It has sloped sides starting off in a perfect square. Then the sumo ring in show in white (salt). Well, this is how I am now thinking of constructing my supporting slab. It will be make of concrete (cement and gravel mix with rebar) but instead of using vertical wood forms, I will just manually angle it upwards just like a sumo ring.
And the circle would be my oven placement on the slab. This way I will save on having to get plywood and constructing form work. I'll also save some on the concrete needed.
Here you can see the 1/2 inch rebar I used. I've grouted the perimeter of the wonderboard below and supported midway the front with my pickax. By tomorrow the grouting should be strong enough to support my 3 inch deep concrete pour...
Also if you look carefully, you can see the beginnings of that sumo ring's sloping.
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