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4. Building the Dome
4M: COURSE 6
Lay Dome Course 6. This is made up of Type 1 and
Type 2 bricks, in an alternating pattern. Two large and
2 small stagger bricks will be needed in the locations
shown.
You’ll need to use the Refractory Mortar to ll the
triangular gap left between the ends of course 6 and
the Entry Arch.
If you nd that the mortar won’t stay troweled in
place, you can temporarily ‘form up’ the inside face
using a piece of plastic or cardboard propped in place
as shown below.
Allow at least 12 hours for the Entry Arch bricks to set. You can leave the formwork in place for longer, however
you will need to remove it before you set up the breglass dome formwork. When you’re ready, pull the plastic
strips from under the formwork, which will allow you to carefully remove it. If the formwork gets stuck, don’t
panic! Just undo the screws that hold it together and gently tap the back piece out using a rod or similar
through the holes in the front piece. With that gone, you can tap the front piece out and remove the side pieces.
4N: COURSE 7
Lay Dome Course 7. This course is made up of Type 1
and Type 2 bricks, in an alternating pattern. Two large
stagger bricks will be needed.
You may nd that the bricks over the entry arch will
need their undersides ground slightly to t. Watch the
level of your bricks as they cross the Entry Arch - don’t
let them dip down.
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