Marble Threshold too High with concrete board
The threshold is supposed to be about 1/4" higher than the bathroom floor tiles. It can be an inch or even higher than the hallway as it may work out. Use a shoe molding to cover the expansion gap.
Tile 4 You LLC Troy, MI
KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!