I purchased a 3 piece tub/shower surround and replaced the walls with green board,patched all the seams and corners with drywall mud,sanded and ready to install 3 piece unit.
Installed first wall opposite fixture wall,drew level line all around the top of the rest of the walls.drilled holes for fixtures and went to put tile wall on for glueing and noticed the top of tile wall is 2" shorter from my level line.
The tub is not level,what can I do besides tearing everything out and staring over, to install back wall correctly?