Install insulation without misalignments compressions gaps or voids in all exterior wall cavities behind tubs and showers.
Rotten wall behind bathroom enclosure.
Then pull the tile and small squares of drywall out together.
Allow the wood and wall cavity to completely dry.
If you find that the wood is rotted you will need to replace it.
Leave a 1 8 inch gap between the bottom.
Make sure the bottom side edge of the drywall sheet extends down over the thin lip of the tub s mounting flange.
To remove tiles that won t budge reach into the wall and use a utility knife to score the drywall from behind.
Leave some of the old drywall exposed where it will meet the new backerboard.
Position the cut drywall sheet on the wall.
If any of the wood studs appear wet and moldy you can clean them with a water bleach solution.
Fiberglass and acrylic tub and shower enclosures come with a flanged edge that attaches directly to the wall studs and the proper way to hide this flange is to install drywall over it.
Drop those pieces into a bucket of hot water to separate the gypsum backing from the tiles.