To get a ¼ inch Hardiebacker use 1 ¼ inch screws. Now tape the seams working with fiber mesh tape. Utilize a flat trowel and thinset to go around it. Let it heal right away just before tiling. Tile with temperament goes a good distance in upgrading an all-white bathroom. https://rowangnquw.thenerdsblog.com/42494287/the-bathroom-refurbishment-diaries