How Tight should Firebrick be

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JrCRXHF

Burning Hunk
Hearth Supporter
Apr 28, 2008
226
Mid, Michigan
I am putting some new firebrick in my harman boiler i bought used and the front two are tight i already cleaned the surface really well. My question is what is the expansion rate of the fire brick and is this going to put stress on the boiler. I wonder if i should take a 1/8 inch off them to give them a little room to grow.
 
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