I am doing a tile job and need some advice. I removed the old tile from a townhouse bathroom and discovered the wall to be more rotted than I had first expected. ( I knew there was a problem to begin with). It's an exterior wall and has the old "Gyproc Wool" type, papered bat insulation along with a now decayed (tar and paper?) vapour barrier. There is a lot of mold in the drywall I removed and I'm sure I'll be bleaching the whole area in the morning. The owner doesn't want me to remove the tub and start from the floor up, but I will be replacing all the dampened/molded insulation and doing my best to clean and dry the area out. Being that it is an exterior wall (with a window), I figure on doing as follows. Am missing anything or doing anything I shouldn't?

*remove insulation, bleach whole area to kill off mold and allow to dry, install new insulation and poly vapour barrier, install cement board or moisture-guard, tape and mud seams with morter, install waterproof membrane and finally install tiles, grout and sealant.

Before starting to reinstall, check window for leaks. Using a hose start below window and work your way up.

Have you found what was leaking to cause mold?

If they don't have one suggest an exhaust fan vented to outside.

Chuck