Just bought some Roxul FB. I explained to the salesman that I was using it to insulate the pizza oven floor. He told me he gets the request often so I assumed he knew what I needed. When my brother brought it home, the insulation seems like it is too soft to be used under the fire bricks and it will lose its shape. Are the fire boards solidspieces that will not lose their shape when weight is applied? The specs are good ( 1200 degrees) but I am worried about being able to lay the bricks flat and even. If I keep this insulation is there anyway of laying the fire bricks even so they don't move?
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