granite hearth cracked

finchsaundersDecember 20, 2009

What should we do next? Our 1 1/4" thick absolute black granite hearth has cracked down the middle from the heat of our fireplace. We don't know what to do. The hearth was installed on top of our wood floor, and the first time we had a fire (with normal-sized firewood)it cracked. The slab was replaced only to have the new one crack with the next fire! The only "different" thing about this hearth is that it sticks into the fireplace about 1 1/2" across the width of the fireplace. The part of the hearth that sticks into the fireplace entrance is 4 1/2" away from the andirons. I assume that the hearth needs to be farther away from the heat, but haven't heard of others having this problem. Advice???

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mainegrower

Properly installed granite should not crack from heat (unless it's not thick enough for this purpose). It is possible that both slabs had hidden internal cracks which were revealed only when the hearth heated up. Another possibility is that the two fires were excessively hot. Starting with a series of smaller fires to acclimate the slab may be necessary to prevent cracking. One more possibility is that the mortar used to set the granite was not fully cured and flexed in such a way that it cracked the stone.

    Bookmark   December 21, 2009 at 5:33AM
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