Don t use tile mastic in wet areas like showers over cement board fiber cement board kerdi floors or with glass tile large format porcelain tile natural stone or most anywhere else.
Shower wall tile and joint with drywall.
Seal the walls with a skim coat and let it dry thoroughly.
My tiler used fat mud to make the shower walls plumb flat.
In areas of high moisture such as walls in a shower for long term durability it is not advised to install tile over drywall even if the drywall is type mr moisture resistant.
What do i do.
Now the mud is quot.
While it probably does a decent job the drywall above the surround may suffer from water that sprays up or from moisture that accumulates on the drywall.
Thicker than the drywall next to it and i don t have the tile on yet.
It will be fine to tile over drywall in low moisture areas such as tiling around a fireplace.
The mud is drying tonight.
Furthermore blueboard is not difficult to install.
Your shower surround keeps water from coming into contact with the wall behind it.
Run the drywall knife over the mortar to create a smooth finish and remove any excess material.
Not only is it water resistant but blueboard is easy to find and inexpensive making it an ideal option for those on a budget.
Blueboard is a type of drywall that is frequently used for a tile wall in a shower.
Push the mortar through the mesh tape and into the 1 8 inch space between the backer board and the drywall.
The bottom line is that drywall and this includes moisture resistant drywall should never be used behind tile in wet areas showers and tub shower combinations.
I ended up with seam aprox 30 1 2 inches and planned take tile or bullnose out to about 33 intent was to use daltile rittenhouse artic white as best white for my situation 3 6 subwayplus bullnose but that puts the joint at or just a smidgen of tile over that seam.
I wanted a flush transition from my shower tiles to the drywall using a bullnose tile that matches my 12x24 shower wall tiles.
In areas that are exposed to an abundance of moisture it is better to install a cement board as a backer rather than a gypsum board.
Tile adds a layer of moisture protection to drywall.
If you have a larger area break the tiles with a hammer and chisel or sledgehammer to get them off the drywall then unscrew and pull down the old panels.
The only place it s ok to use it is when tiling in non wet areas over drywall with small ceramic tile.
How much of a tile should bridge the backer drywall seam.
These days that s almost nowhere.
Mix thin set mortar according to the manufacturer s instructions and apply a thin coat over the fiberglass tape with a drywall knife.
Sand with a medium grit sandpaper to create a uniform surface that s not too smooth.