There s no point in fixing damage that will only recur so the first step is to determine the cause of the wall damage.
How to repair sheetrock walls behind bathroom tile.
Cut out the drywall.
If you are looking to place tiles on a drywall inside a bathroom you will need to use a vapor barrier or some type of backing in order to prevent the sheetrock from getting wet which will cause it to deteriorate.
Apply a coat of joint compound to the edges using a 6 inch drywall knife.
Purchase the joint compound putty knife primer adhesive and other materials needed to apply tile from a home.
If you have to use regular drywall then a water barrier must be inserted behind the drywall and the wall frames.
Work carefully to keep from scratching or breaking the tiles you remove.
To remove tiles that won t budge reach into the wall and use a utility knife to score the drywall from behind.
Embed fiberglass mesh drywall tape in the wet compound scrape off the excess and allow it to dry for at least eight hours.
Allow the joint compound to cure prime it and paint it the same color as the rest of the non tiled area.
Patch any holes or cracks with spackling compound and sand the entire surface with medium grit sandpaper.
If the tile does not completely cover the joint apply a coat of setting type joint compound which is more water resistant than typical joint compound to the joint.
How to replace the sheetrock around the shower bathtub.
Loose bathroom wall tiles or a wet spot on the bedroom or hallway side of your shower wall indicate a problem with moisture.
The tile in your bathroom is likely adhered to one of two materials.
Install your tile as planned.
Scrape the wall to remove any texture and to create a flat surface.
Step 5 apply two more coats of joint compound allowing it to dry completely in between coats.
Then pull the tile and small squares of drywall out together.
Cut and install a cement board patch.
Drop those pieces into a bucket of hot water to separate the gypsum backing from the tiles.
Remove any remaining dust oils and grease from the wall with tsp tri sodium phosphate or an ammonia based cleanser.
Vacuum to remove dust.
This is done to help prevent water from damaging the structure of the wall.
Some type of wall board like drywall or backerboard or a mortar bed.