Bath area top need to paste mosaic, what material ceiling material to ensure that no deformation? Cement board Calcium silicate board
Calcium silicate board is generally better than home, bathroom ceiling is generally aluminum plate and light steel keel
The keel used in the ceiling must be strong, will not be deformed, if the keel deformation, then the top will be affected.
It is recommended to use the cement board to do the ceiling, and then use the interface agent brush it again, and then coated with cement mortar layer of 1 cm or so leveling, so you can paste the mosaic.