If the underlayment isn t in good shape put a 1 4 or 1 2 in.
How flat does wall need to be for tile.
For really bad floors self leveling compound also called self leveling underlayment is a lifesaver.
But this can be remedied by taking the following step.
Check the wall first to see if it is straight.
However the other two walls of the shower enclosure are plaster.
If it is off by more than a half inch you need to correct the wall or floor.
These systems should be used as a crutch to fine tune the lippage on the tiles.
Just because there isn t lippage doesn t mean the floor or walls do not need to be flat as well.
If your plumb or level is off by no more than a half inch over the course of eight feet it will show in your tile installation.
A stiff base will also prevent the tile from cracking.
There is no need to use a ledge to support the tiles.
Vinyl tile is a good undelayment if it isn t damaged.
How flat do the walls of a typical shower enclosure need to be for tiling.
If existing tiles are beyond repair remove the tile and install a piece of wallboard in its place.
One wall is aquapanel on studwork and is pancake flat.
The leveling spacers will hold the tiles together on the wall.
You just mix the powder with water and pour to create a flat smooth surface.
The tcna handbook 2011 page 33 recommends for tile with any side 18 or longer the grout join shall be on average a minimum of 1 8 wide for rectified tiles and on average a minimum of 3 16 wide for calibrated non rectified tiles what are some tile installation challenges associated with offsets to manage lippage.
To achieve this be sure to use the appropriate patch or self leveling compound with the same manufacturer s primer but never thin set mortar.
As noted in the first answer above the surface to be tiled in your case the floor must be flat within 1 8 in 10 when measured from the high points of the floor.
Slide a 4 foot straightedge or level over the wall in all directions to check for plumb.
Additional trim and baseboards can cover up severe problems.
Do this prior to any tiling job.
If you find low spots more than 1 4 in.
They should not be used to manipulate and bend the tiles so they conform to a substrate with highs and lows.
So before you tile check the floor with a 4 ft.
Remove the tile and prepare the wall according to the corresponding instructions above or tile over the existing tile.
Wash the wall with tsp tri.
Beat the first few rows of tile into the mortar with a rubber mallet until they.
Repair any loose or cracked tiles.
To do so make sure all of the tiles are intact and secure.
Cement board underneath the tile to build it up.