New to the thread, so apologize if this is a repeat. I'm interested in tiling over my existing ceramic tile in the kitchen/hearthroom. Tile is in good shape, although it does have a slight gloss. I know the right thing to do would be to rip it out, but we're talking approx. 600 sqft of tile with thinset both above and below 1/2" cement board. I hoping to do anything to avoid the tearout, so is tiling over this tile an option? I've heard mixed reviews from different sources. My plan, if I move forward would be to clean the surface with TSP and let dry. I'd plan on using a polymer modified thinset to secure 12x12 inch tiles over existing 12x12...careful not to match grout lines. What issues am I not considering? I've done the load calculations using various forumulas and come up with about 50lbs/sqft based on my 2x10 joists 16" OC and max span of 15ft. Do I need to be worried about the extra weight? In my mind, I'm only adding about 5lbs per sqft with the new tile, so it shouldn't be an issue. Please let me know what you'all think. Thanks in advance.