Best construction/prep method for bathroom floor?

[peterparker]

Hi there

I'm new to the forum so please bare with me. I am having an en suite shower room fully tiled with electrical ufh, it used to be a bedroom. At the moment there are just joists, the boards are shot so will be going in the bin. It's quite a large room ie 3.8m x 2.7m.

What I'd like to know is the best way to construct the floor from the joists up. Cost is not an issue, it has to be a perfect job which lasts.

I've read lots of historic posts and know that I need some combination of 18-25mm wbp ply, hardie backer, insulated board, ditra matting, latex, flexible adhesive etc.

I just need to know the exact order they go in etc.

Thanks in advance for your help

 

[peterparker]

Hi Stef
The builder has actually already bought the hardie backer board. So shall I just cover it in tanking paint?

Thanks

 

[Stef]

If it's already been bought then yes just tank it out.

 

[peterparker]

Thanks Stef, your advice has been very helpful.