Tiling to HardieBacker 12mm Cement Board

[robmorris]

Hello

I wish to tile direct to 12mm cement board.

Does this board need to be flush (With adheisive) to a sold wall before I can tile onto the board?

As I wish to box in some pipes and build a storage unit from it so it will be 'floating' around a wooden frame. Am I able to tile to the board whilst its across a frame or will it bow?

Or perhaps a treated Ply or plasterboard is better suited?

Thanks

 

[L95]

Screwed with tile adheaive as a gap filler.