There are a few reasons why tiling over wallpaper is problematic mostly because you re risking your expensive tiling job on a surface where you re cutting corners to prepare.
Put kitchen tiles over 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.
Use two coats if necessary.
If they do simply make the spaces smaller or eliminate them altogether.
You may tile over existing tile painted or unpainted drywall plaster and textured walls.
Let the wall dry thoroughly.
Roll the primer on evenly.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
Lightly sand the paint.
Remove any remaining dust oil or grease with tsp tri sodium phosphate or an ammonia based cleanser.
Scrape away any loose or peeling paint or wallpaper.
Adding a backsplash to a painted wall can also help cover damaged drywall or tile work.
Start by removing any molding switch plates outlet covers and other hardware attached to the area being tiled.
If you plan to do this backsplash project over existing tile you will have to make some modifications.
Whether your end goal is hand painted mosiac tiles for a hallway or painted tiles for a backsplash one of the most important steps in learning how to paint tiles is using a primer.
If you re not sure if you have lead paint test kits are available.
Primers hide any unwanted colors and designs and will help the new paint adhere better to your tiles.
Tile on tile or as i say it.
And it lasts for 20 years.
Wall preparation is an important step when you in install tile on a painted wall.
The overwhelming consensus from home decorating centers and tiling companies is no you should not tile over wallpaper.
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However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.