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The bricks surrounding my fireplace have cracks between them. It's as if the thermal expansion/contraction has eroded the mortor between the bricks. I have had some serious fires in there and haven't had a problem but I am worried that the lack of grout may be a fire hazard. Is there a grout or mortor than I can force into the cracks?

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Look into: diy.stackexchange.com/questions/27534/… Different issue but still dealing with fireplace heat and expansion/contraction. –  Jason Sep 7 '13 at 14:16
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