The product Foamglas is my go-to choice as it is solid, waterproof, and easily cut. Other, clay-based products will turn to mush if wet, a major downside in outdoor situations.
As shown, a metal ruler with appropriately spaced holes makes a compass for laying out the floor and scribing dome diameters.
I lay the floors in herringbone pattern for two reasons:
It looks great, but as importantly,
so that the pizza peel has no lateral minute seams to catch on.
After scribing the exterior, the bricks are cut to the arc and replaced.
No mortar is used in any of these steps.
|For restaurant or bakery ovens, a subfloor is laid straight.|
|Second floor goes on top, herringbone pattern|
|Double floor ready for dome build|