I just installed an acrylic tub in an alcove in a bathroom. I used 5/8 green board (mold resistand drywall) in the entire bathroom. Instead of doing what I should have and pushed the tub to one side while furring out the other wall, I center the tub in the alcove and the 5/8 fit perfectly behind the tub flange on each end. Now the tub flange sticks out 1/4" which presents a problem when tiling.
My quick fix idea is to install 1/4" Hardibacker over the top of the 5/8 green board bringing the hardi flush to the flange and and then tile over that to within 1/8 of the tub deck.
The Question .... If I install it over the drywall can I just use long screws and attach it per the normal screwing schedule or do I need to put some sort of mastic behind it to help support?
My quick fix idea is to install 1/4" Hardibacker over the top of the 5/8 green board bringing the hardi flush to the flange and and then tile over that to within 1/8 of the tub deck.
The Question .... If I install it over the drywall can I just use long screws and attach it per the normal screwing schedule or do I need to put some sort of mastic behind it to help support?