Just make sure that all of your tiles are in good condition.
How to add layer to wall prior to tiling.
If you don t have enough replacement tiles or if the tiling is too damaged then you will have to remove the tiles before you put on the new ones.
Wash the tiled wall with tsp to ensure a clean and non greasy surface.
Apply a 1 8 inch 0 32 cm layer of adhesive to the wall.
Remove any remaining dust oils and grease from the wall with tsp tri sodium phosphate or an ammonia based cleanser.
Once it s ready for tiling there is no need to tape the joints.
It is needed for the adhesive to bond well.
Fresh plaster needs up to a month for the material to set in and fasten.
Do this prior to any tiling job.
Find the middle of the area to be tiled and work out from there.
Apply the last layer of skim coat and use a medium sized sandpaper to achieve a rough texture.
Patch any holes or cracks with spackling compound and sand the entire surface with medium grit sandpaper.
Increasing the floor height can create problems in a room with cabinets or a toilet and it may cause headaches at transitions to other rooms with different flooring.
Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
You may also paint this area if only tiling a portion of the wall to minimize cut in work around the tile.
If not then replace any cracked tiles with other tiles or wallboard.
Lay a flat board over the tiles paying attention to the uneven spots and beat the board with a.
Check the wall first to see if it is straight.
Prime to seal it and let dry.
If you add a layer of plywood or cementboard however you could raise the floor by as much as 3 4 inch not including the extra height added by the tiles themselves.
Layout is important to the finished product.
Use a trowel with a 1 4 to 1 2 inch groove to produce an extra thick mortar bed for the tiles.
Vacuum to remove dust.