Q. What is the proper grout for an exterior limestone walkway? Is there a dry grout that can be swept between the stone? Where would I look for stone dust? A. The proper grout will depend on how the stone is set. Will it be set in mortar or placed on... Read More

Q. The installer of my granite countertop used a color enhancing and impregnating sealer.  I wish he would have asked if I wanted the deepened color. Is there any way to return the granite to the original color and then reseal with non enhancing... Read More

Q. I am facing a problem with my Calacatta marble floor. Some tiles are getting darker because of the moisture content increment, so is there any chemical that can be used to suck out the moisture from marble, and return it into white color? Thanks... Read More

Q. I cleaned soot off my fireplace stone, but it won't come out where it has seeped into the stone. A. Smoke and soot are made up of very fine carbon and oily particles that can become absorbed into the surface of porous stone. Once that happens... Read More

Q. We have mold buildup in grout joints and surface has film on it. What is best to clean mold and remove film from surface?   A. There are several cleaners that will remove the mold but you must be careful to choose one that will not damage the... Read More

Suppose you have an interior granite wall that had some silicon caulking used in the grout joints. The silicon then caused staining along the grout edges. A poultice successfully removed the staining, but then later, the stains reappeared. What... Read More

Q. I purchased prefab granite counters after being told it was every bit as good as regular granite slabs. They were installed in January and in March I started noticing the granite was cracking and small pieces popping up. A piece got caught in my... Read More

Q. My master bath was remodeled approx. 8 months ago and we used honed and tumbled travertine. It was professionally installed and moisture barrier was used in shower. Approx a month ago, I noticed a few black "dots" on the floor of the shower (they... Read More

Q. I have a 2nd floor shower with moisture resistant sheetrock. I want to put 18" travertine tile on the walls above the pan. Using modified mortar, can these tiles be put on the wall with mortar blobs leaving an air space behind tile or do the tiles... Read More

Q. A Liquid Plumber bottle leaked on my beige limestone bathroom floor. It looks like a wet mark. Is there anything I can try to remove stain? It is a heated floor. A. Liquid Plumber is a very high alkaline substance, which leads our stone expert to... Read More