oven floor help

[ycart]

I am building an oven and I am confused a little about the floor. I have a 4 inch concrete base and I was going to make a 4 inch Vermiculite/cement on it should I do another layer of concrete on the Vermiculite layer or build the fire bricks on it ? Also should the sides fire bricks be on the first slab or on the last one ? It is going to be a barrel oven.
thanks

[Nic The Landscaper]

Place floor bricks directly over vermicrete and place wall bricks on vermicrete as well. Basically the idea is to completely isolate the firebricks in insulating layers.

the only time that I would stray from the above prescribed method is if it were a high production oven that will be fired daily, and then I would just add more fire brick for the extra mass.