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How can I tell if a sealer is no longer working?

The best way to tell is to perform an absorbency test as follows: Take a drop or two of water and place it on the surface of the stone. Record the time it takes to soak into the stone. If the water soaks into the stone in under five minutes, the... Read More

We have an interior granite wall that has some silicon caulking used in the grout joints. The silicon caused staining along the grout edges. We poulticed the stain and successful removed the staining, However after three months the stain is returning

First, did you remove the silicon caulking. If the source of the staining is not removed it will continue to be a problem. I would recommend removing the silicon caulking and replacing it with a non-staining urethane caulking. If you did remove the... Read More

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

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