How much does firebrick expand?

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EatenByLimestone

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I had a layer of firebricks piled up on top of the secondary feed tube. I had found that it helps warm the air and allows the secondaries to come in earlier in the burn cycle.

This morning I drove to the stove shop and picked up a few feet of Kaowool. I filled in some spaces where there was a bit of leakage around the bricks. Due to the thickness of the kaowool, I had to press a firebrick down into it's spot. The wool still had room to compress, but not much. How much longer will a firebrick get when it's heated?

Matt
 
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