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They should not. The masonry chimney in our house becomes only warm to the touch after a few days of a continuous burn, and most mirrors will be mounted so that there is a least a small airspace between the mirror and the chimney. If a mirror were to be firmly attached to a chimney at multiple places, it COULD crack from the minor expansion of the brick- but a framed mirror HUNG from a chimney should not. Most of the pre-civil war estate house in Virginia have mirrors above the mantels- with no cracks.

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12y ago
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3mo ago

Mirrors can potentially crack if they are exposed to rapid or extreme temperature changes. If the mirror is securely mounted and well-ventilated, it is less likely to crack due to the heat from a fireplace. However, it's best to use tempered or heat-resistant glass for mirrors in high-heat environments to minimize the risk of cracking.

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Q: Will mirrors mounted over a brick fireplace crack from the heat?
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