I would like to have a toilet in the house, bathroom with mineral wool board cut off or light steel keel gypsum board line?
The walls of the bathroom must be waterproof and moistureproof, or it will be deformed and affect life. And the bathroom wall to do the waterproof treatment, or the toilet to the area of water and more will then penetrate the other side of the wall.
You said the mineral wool board and gypsum board can not be used because they are not waterproof tide will be deformed
Recommended ceiling with PPC or aluminum gusset plate is to do with the wall with calcium silicate board is the cement board on the line waterproof paint with a little better is no problem
These two estimates are problematic, you can use light steel keel cement pressure plate nail steel wire mesh paint, do waterproof post-paste wall tiles, the following also do waterstops
