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Step 3Assemble the Floor and Walls
For the floor of the oven built at Machine Project, we first used a single layer of concrete pavers to create some insulation. 4'x4' grid, 16 pavers total.
Alternatively, Tom Niccum used a 4' x 4' ISO board, an easier (but much more expensive) solution if you don't already have a flat surface underneath.
On top of the first layer, start laying out the firebricks into a square floor that is 5 bricks wide by 10 bricks deep. If your firebricks aren't of standard size, you want the floor area to be square and close to 4'x4'. A few inches short is OK.
Take the 4' angle iron pieces and drill a hole at each end, large enough for the threaded rod to slot through, but small enough that the nut can be screwed against it without going through it. We'll use these metal pieces to hold the sidewalls in place. Place two of them on the floor of the oven, one on the right and one on the left side.
Assemble the side walls by standing bricks on their sides, placed on top of the angle iron that runs them the length of the floor. Starting from the back, put thirteen bricks on each side (see photos for positioning). Add one layer of bricks on their side on top of that layer..
For the back wall, stack bricks on their sides in a staggered pattern. You'll need to break a few bricks in half to have the back wall sit flush with the sidewalls. Go six levels tall and on the last level, leave the sides open as the roof will start arching in here.
Once you have the sides in place, you can put the other two angle iron pieces on top of the bricks and slide the threaded rod through the holes. Screw the nuts into place but don't lock it in yet, in case you have some adjusting to do.
Alternatively, Tom Niccum used a 4' x 4' ISO board, an easier (but much more expensive) solution if you don't already have a flat surface underneath.
On top of the first layer, start laying out the firebricks into a square floor that is 5 bricks wide by 10 bricks deep. If your firebricks aren't of standard size, you want the floor area to be square and close to 4'x4'. A few inches short is OK.
Take the 4' angle iron pieces and drill a hole at each end, large enough for the threaded rod to slot through, but small enough that the nut can be screwed against it without going through it. We'll use these metal pieces to hold the sidewalls in place. Place two of them on the floor of the oven, one on the right and one on the left side.
Assemble the side walls by standing bricks on their sides, placed on top of the angle iron that runs them the length of the floor. Starting from the back, put thirteen bricks on each side (see photos for positioning). Add one layer of bricks on their side on top of that layer..
For the back wall, stack bricks on their sides in a staggered pattern. You'll need to break a few bricks in half to have the back wall sit flush with the sidewalls. Go six levels tall and on the last level, leave the sides open as the roof will start arching in here.
Once you have the sides in place, you can put the other two angle iron pieces on top of the bricks and slide the threaded rod through the holes. Screw the nuts into place but don't lock it in yet, in case you have some adjusting to do.
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