Here are a few pics of the building of my 42" oven. As you can see, I used white "air blocks" as the insulating layer under the hearth. These measure 23x 7" x 3.5" and are super lightweight. I have them on their sides. The firebrick are called Mot 30, produced by Siam Refractory and are different than typical firebricks in the USA. These are good to 1600F and very tough to cut - they don't break easily or evenly. So my base is 7" with 4" firebrick, wall chains built on top of the hearth. For mortar, I used a Siam Refractory product - "43 AMD" high temp refractory mortar mixed with a little bit of Portland & lime. The 43 has 44% alumina, 51% silica and 1.5% iron oxide; rated at 1600F.
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