However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
Sealing plaster walls before tiling.
One handy tip my father in law taught me three years ago was if you plan on tiling a wall and the wall is uneven then the plastering doesn t need to be abs.
If you are using a cement based adhesive then you will need to prime the plaster with a suitable primer i personally only use weber pr360 it is a acrylic primer and i use this type of adhesive on all walls now apart from on kitchen walls with small tiles then i will use tubbed adhesive.
You can tile over a wide range of surfaces and textures but wall preparation is absolutely crucial.
Make a mark on the wall with your starting point.
Before you get to it you should level the bathroom the kitchen and or the hallway walls.
Tiling onto plaster backgrounds.
When applying tile to a plastered surface it is important not to overload the weight of what the plaster will take before failure occurs plaster will support about 20kg m2 or about a 9mm thickness of.
If you re not sure if you have lead paint test kits are available.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
You could use a coat of thinned pva to seal the plaster or you could mist coat the plaster with a thinned coat of emulsion which will seal it and will not affect adhesion of the tiles.
Make a gauge rod using a length of straight timber.
Plaster is a weak material compared to brick and cement.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.