The Fire Brick D130 Instruction Booklet page 33

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3. Building the Dome
3O: COURSE 7
Lay Dome Course 7.
This course is made up of Type 2 and 1 bricks.
3P: COURSE 8
Lay Dome Course 8.
This course is made up of Type 2 bricks, with small
and large stagger bricks in the locations shown.
Beyond this row there is no need to stagger the brick
joints, we are now laying complete rings of brick and
they're no longer visible from the mouth of the oven.
INSTALL FIBERGLASS DOME FORM
At this stage we recommend you remove the Trammel
Tool and use the Fiberglass Dome form to lay the
remaining rows of bricks on. Put the fiberglass dome
into the oven through the door or the hole in the top
of the dome, and prop it in place using the circular
plywood and a car jack. Some bluetack to hold the
plywood support to the top of the jack is very helpful.
You can continue laying the dome bricks with the
trammel tool if you choose to; it gives you more
control over the final position of each brick, as you
can see the inside face of the brickwork. You can't
see the inside when using the Fibreglass Dome. The
downside of the trammel method is that it's quite
slow due to the angle the bricks are being laid on.
If you find that the bricks are starting to move once
released from the tool, use this trick: soak your bricks
in hot water rather than cold. The heat accelerates the
chemical reaction in the mortar, making it set more
quickly, so you don't have to wait as long for each
brick to set before removing it from the trammel.