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We live in San Francisco and are refurbishing our town house. We would like to use marble on our kitchen floor, but are concerned it may crack during an earthquake. Is there any way to install it that would minimize the cracking?

There are several fracture membranes that can be installed to help minimize cracking. These membranes are rubber or plastic-based and are designed to absorb some shock. However, you will not totally eliminate cracking if the tremor is severe.... Read More

My granite floor appears to be developing cracks beneath its surface. These cracks do not go all the way through the tile, but can be seen only in a bright light and only at certain angles. It almost looks as if they’re cracking from the bottom

The condition you are describing is called compression cracking. It is caused by movement of the substrate to which the granite is attached. If the granite tile is set over a plywood floor supported by joists, movement in the floor may be responsible... Read More