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Re: Old broken bricks, sand & fireclay slurry as insulation between firebricks and slab?
From the WFO board
Posted by Craig
In Reply to: Old broken bricks, sand & fireclay slurry as insulation between firebricks and slab? posted by Bob Bourne
I am not sure why you would put the old broken bricks underneath the fire brick hearth, the slab itself is an insulation. It is fine to place the bricks flat ( 75mm ) (3 inches) all it means is less thermal mass, but if your oven is a home oven for family cooking only, it will be more than fine.
So without the old bricks you will still have 150mm (6 inches wide) of thermal mass layer.
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