The moisture in the cement makes the emulsion go soft and it can loose its grip on the wall.
Tile over painted wall.
Can you install tile on a painted wall.
If you re not sure if you have lead paint test kits are available.
If your paint tests positive call a professional.
Start by removing any molding switch plates outlet covers and other hardware attached to the area being tiled.
Remove any remaining dust oil or grease with tsp tri sodium phosphate or an ammonia based cleanser.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
Sand the old tile step 4.
Only on the boarder tile mind.
Paint with epoxy paint.
Choosing the right tile.
Repair chips and cracks step 3.
Scrape away any loose or peeling paint or wallpaper.
However sometimes is it much easier to tile over tile the existing layer.
I would suggest marking just below where the tiles are to finish.
Preparing the drywall requires that the surface be roughed up with a sanding sponge prior to applying the mastic to adhere the tiles in place.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
Apply primer step 5.
For instance if you are tiling over a painted.
However this requires careful consideration and extra properties from the adhesive.
Wall preparation is an important step when you in install tile on a painted wall.
Things you will need orbital sander 80 120 grit sandpaper safety glasses dust mask rags tape measure pencil 48 inch spirit level mastic or thin set mortar grooved trowel tile spacers tile cutting tool grout grout spreader sponge grout haze remover optional distilled white vinegar optional.
Choose the right materials for the location.
Previously painted textured drywall prep.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
Spread a small amount of mortar in an arcing fashion onto the wall where the tiles will be laid using the grooved edge of the trowel.
It is possible to tile over painted drywall as long as the drywall is sufficiently prepared beforehand.
Score a line and then using a wall paper scraper see if you can lift the paint from the wall before tiling.