Can You Tile Over Existing Tiles? Six Checks for the Floor, Walls and Shower — An overlay holds only where every old tile is still bonded, and in a shower it keeps whatever membrane lies underneath, leaks included. Six checks for floors, walls and showers, and where the 12 to 16 mm a floor gains runs into doors and drains.
Tile, Glass or Stone Slab: Which Kitchen Backsplash Belongs Behind the Hob — One maker's warranty leaves heat cracks in its quartz with the owner and covers thermal-shock cracks in its sintered stone. That clause, your hob's manual and the state of the old tiles decide which material goes where.