Backerboard Concrete block bench (Wetroom)

[missbuilding1978]

Hi All,

Hope you can help.

I am just wondering whether I should backer-board the concrete block bench in my wet room, applying it with a tile adhesive. Or can I tile directly on top of the concrete block work?

I worry about moisture or cracks within the concrete block/to tile directly on top of it, so wondered it may be best to backer-board it then tile first to prevent this?

Also, I noticed I did my block work in front of the backer board. ideally, I should have done my bench first then backerboarded on top. So if I was going to do this with the idea of backboarding the bench then should i cutout a recess in the wall and then slide the backerboard on top of the bench but under the backer-board wall.

Photo is below.