Summary: Learn how to tile on tiles, make sure tiles are secure, clean tiles and lay new tiles over tiles.
Often people are unsure as to whether it is possible to re-tile a wall by fixing new tiles onto existing ones. It is possible to tile over tiles, however the weight of the new tiles should not be so much that it causes the old tiles to become unstuck. You will need to check that the old tiles are firmly attached to the wall otherwise the new ones cannot be added.
One of the problems that can occur with having two layers of tiles is the fact that the increased thickness of the wall can make it difficult to finish around architraves or doors/windows and can obstruct electrical sockets.
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