Q1. Can I tile over old tiles, or should I remove them?

A1. Yes you can fix tiles over existing tiling, but first you need to check that the existing tiling is firmly bonded to the background, then clean and degrease the tiles. In order to get the best possible results you will have to rough the surface of the tile possibly using a piece of sand paper, once you have disregarded the dust off the tile then proceed to cover the tiles using PVA so that the tiles will have that extra bond with the existing tiles. We recommend that if you're tiling over tile on the wall use multi fix and flexible rapid set for the floor.