We have a fireplace in our lower level that is outdated, dingy old masonry and doesn‘t fit with the rest of our updates down there. I would like to tile over it and have it ready for use before our family comes over for Thanksgiving. What is the best method?
You can attach tile directly to masonry, it has been done all over the world for centuries (Italy, Spain, Middle East all use tile on the exterior of buildings...) I would assume normal thin-set mortar would work, but I believe it would depend on the exact type of masonry- concrete block or clay brick. A thicker adhesive bed will likely be necessary to smooth over the rough surface, but because of the relatively porous surface of most types of masonry your bond should be excellent. My only word of caution would be if you have any cracks in the masonry. Make sure they are not active (widening and narrowing), which may occur with temperature and humidity swings. Either way, you may choose to weld the crack with epoxy to prevent any crack movements that may telegraph through your tile and crack it. HTH, Andrew Kester, PE Structural Engineer Florida (..and a tile afficianado..)
