Originally Posted by Carbon
With a form you'll be 100% certain how high the dome ceiling will end up at.
Check out this famous builder's method which looks pretty sloppy but he uses a sand form in this set of photos. I like that refractory liquid mortar he pours over the entire dome. Seems like his whole build procedure saves a lot of time.
Carbon, very cool article and slideshow on how this NY pizza oven was built. I LOVE the idea of building it on top of a sand form, letting it "set" - then digging out the sand. Very good idea indeed . . . .