Place a wide drywall knife on the wall at a 45 degree angle.
Tiling bumpy walls.
Vinyl tiling can be used for a broad variety of applications in your home most commonly your floors.
Move the knife in upward downward and sideways directions loosening and removing the surface of the texture from the wall.
Wipe with a damp cloth to remove any remaining dust and allow to dry.
Sand the area with medium grit sandpaper until even and vacuum up the dust.
Things you will need measuring tape tile wet saw leveling spacers and wedges trowel thinset mortar rubber mallet grout grout float grout sponge.
Mark off an area of equal size on the floor nearby.
Prep a wall for tile.
You may also paint this area if only tiling a portion of the wall to minimize cut in work around the tile.
You can tile over it but it needs to be smooth to prevent your new tiles from laying crooked.
Prime to seal it and let dry.
Sand the wall with medium grit sandpaper 80 grit to further smooth the texture creating an even surface on which to apply the tile.
Measure the wall where you want to install the tiles.
Sand the paint on the wall using 80 grit sandpaper.
Do not smooth the wall completely.
Look for 100 grit or 80 grit sandpaper and wear a mask to protect your lungs from the particles in the air.
On dec 17 2019.
How to install wall tile over textured paint 1.
Just remove the roughest part.
However if you want a more unique approach you can put peel and stick vinyl tiling on your walls.