Started the Process - A couple of Questions

[PizzaJNKY]

George, perhaps someone else can tell you exactly how much insulation is enough, such as if you use FB board do you still need vermiculite. All I know is that you can't have too much insulation. If you budgeted for FB board, I'd say use both. I used both, a 3-1/2 inches of perlcrete, and then the 2-inch insulation board resting on top of the perlcrete.

[George T]

I bought my material for the hearth. Both the insulating hearth and the structural. Can these both be poured the same day? Do I pour both the same size? The instructions say you can pour the insulating hearth smaller....how much smaller? Sorry for all the dumb questions?

[PizzaJNKY]

There are no dumb questions. I poured the structural layer, and waited a few days to pour the insulating layer of portland/perlite. I actually poured both slabs the same size, but I think it is better to make the insulating slab smaller, because it is so crumbly. I think it should be be big enough so that your oven fits within it (Hope that makes sence). Check out the Badger build photos, he did it correctly.