Home Improvement Questions? Ask a Handyman for Answers
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If you're talking about the "firebrick" liner in the fire box, there is no material you can use to repair it. Replacment is the only option.The back is usually what takes the most heat abuse and usually fails first. If you get to it before it really starts to break down you can use a cast iron fire back against the back wall. You can even use a piece of 1/4 steel plate on the floor on top of the firebrick if you have trouble finding replacements.