A brick pizza oven dome is usually constructed as either an igloo or barrel dome out of medium density fire bricks both shapes are constructed in much the same fashion with bricks mortar and usually with a supporting frame.
Tiling a pizza oven dome.
Construction of an igloo dome does not necessarily require a frame if completed by a competent brick layer.
The dome itself a series of self supporting circular brick chains that curve inward until they meet at the keystone at the oven top.
It is to do with the sand and afterward place the bricks onto them.
These ceramic and glass tiles present a very convenient medium to finish the dome of the oven since their flexibility allows them to repeat the shape of the dome.
Then apply a tile and grout sealer to seal the grout.
To get a perfect shape dome put the sand in the shape of a dome.
I love in the north east of england in the uk we have an outdoor pizza oven which i am looking to mosaic tile.
Then using a string and marking pen build a compass half the diameter of your oven 18 or 21 and mark the circumference of your oven floor.
You can also frame and decorate the front portion of the dome arch with granite or other materials.