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Got a solid concrete base, blockwork walls (every other hole filled with concrete) and a floating hearth has been poured. All looking good. But...
...I've laid 50mm (2") of Hebel blocks and then 75mm (3") of insulating tiles on the hearth and now I find that the hearth is not dead level. It was spot on when I checked (and re-checked) the formwork, but maybe something moved after we poured the concrete and it's about 6mm (1/4") out across the width of the proposed 36" oven.
Well hell, no big deal, I thought. You really can't tell unless you lay a level across the tiles. If the floor of the oven is just slightly out it's not like my pizzas are going to slide off to the side. But how do I make sure the oven itself is square?
I was just going to lay the Hebel and the insulating tiles directly onto the slab - it's quite flat. So should I use a mixture of sand and firebrick clay to level it all up? I understood this mixture was more a case of bedding the tiles if there were slight bumps and high spots. Could I use it to correct the slight slope? It would mean that I'd have about 6mm thickness of the mixture on one side reducing to zero on the other. Would that 6mm thickness be stable enough to support the bricks making up the wall?
Does that mixture set pretty solid?
...I've laid 50mm (2") of Hebel blocks and then 75mm (3") of insulating tiles on the hearth and now I find that the hearth is not dead level. It was spot on when I checked (and re-checked) the formwork, but maybe something moved after we poured the concrete and it's about 6mm (1/4") out across the width of the proposed 36" oven.
Well hell, no big deal, I thought. You really can't tell unless you lay a level across the tiles. If the floor of the oven is just slightly out it's not like my pizzas are going to slide off to the side. But how do I make sure the oven itself is square?
I was just going to lay the Hebel and the insulating tiles directly onto the slab - it's quite flat. So should I use a mixture of sand and firebrick clay to level it all up? I understood this mixture was more a case of bedding the tiles if there were slight bumps and high spots. Could I use it to correct the slight slope? It would mean that I'd have about 6mm thickness of the mixture on one side reducing to zero on the other. Would that 6mm thickness be stable enough to support the bricks making up the wall?
Does that mixture set pretty solid?
)
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