The Fire Brick D130 Instruction Booklet page 31

31
3. Building the Dome
OPTIONAL THERMOWELL INSTALL
If you purchased the optional Thermowell and
Temperature Gauge to mount through the oven wall,
take the Thermowell and lubricate the stem with
vegetable oil (to prevent the mortar bonding to it).
Set it in the base of a mortar joint between rows 3 and
4 as shown. You may need to widen the joint, or grind
the corner off a brick to allow room for the stem to fit.
Fill mortar around the stem of the Thermowell and
make sure you're happy with the angle it's on. Continue
the build. When the mortar has set hard, slide the
Thermowell out and set it aside to be installed later,
just prior to applying the Perlite Render.
3K: COURSE 4
Lay Dome Course 4. This is made up of Type 1 & Type
2 bricks, in an alternating pattern. Two small stagger
bricks will be needed in the locations shown.
3L: ENTRY ARCH
Do a 'dry-run' of the Entry Arch, checking the gap
between each brick.
Once you know the gap size, mortar the Entry Arch
bricks over the #1 formwork, working from the
outside in. With the full arch in place, the weight keeps
the joints in compression and the arch becomes self
supporting.