Good morning,

Thank you for your input. How would you secure the tile flange against the studs if you are not using screws? Does this mean the cement board that he placed up needs to come down?

Also, since this is luckily an error that was caught early but by the homeowner then who should eat the cost of this? I do not think it is my fault for not catching it before the cement board was put up.

Thank you again.