It is possible to clad over tiles, but it is not recommended. Cladding is a material that is typically applied to the exterior of a building to improve its insulation and weather resistance. Tiles are not an ideal surface for cladding because they are not very water resistant and they do not have a smooth surface that would allow the cladding to adhere properly. If you decide to clad over tiles, it is important that you use a waterproof adhesive and sealant to ensure that the cladding does not peel or flake off.