Staining from silicon can be very difficult to remove, but not impossible. First remove all the silicone caulking; removal of the stain will require the application of a poultice and a strong solvent such as methylene chloride. Several applications... 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. 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. Refacing a fireplace with 30cm slate tiles. What is the best adhesive to use (only about 25 pieces of tile involved so don't want to have to purchase a 50lb. bag of anything)? Would a premix mastic work? Will I need to provide support for the... 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. Natural stone tile installation has water marks that aren’t fading after 2 weeks of installation. Should I apply a poultice to remove the moisture? MSI sells the stone. It's called white oak. It's honed marble, 24 inch tiles, and... Read More

Q: I'm laying "penny" mosaic tile on top of a heating system. I had to use a light amount of thinset in some spots due to leveling issues. As a result I have some tiles that are coming up (I have not yet grouted). I am going to use spectralock... Read More

Q. Can cement tiles or ceramic tiles be installed on top of Corian or Avonite? I am restoring a kitchen on a tight budget, and I prefer to cover the existing countertops vs rip out and replace.   A. Yes, you can install them directly over the Corian... Read More

Q. We are considering using a large format marble tile on a kitchen wall. The tile is 7 1/2" X 24" X 3/4". Is this size tile too heavy to use on a wall? Is special thinset needed? Currently the wall is lathe and plaster (100+ yr old home), should... Read More

  Q. What can we do to clean marble lobby floors in our various commercial buildings? A. The yellowing and graying of certain Italian and Greek white marbles is a common problem that I see all over the world. There are several possible causes for... Read More