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DavidJ

I've discovered the existing bathroom floor is only 15mm ply. I believe this is thinner than regulation requires. The adjoining chip board on the landing appears to be slightly thicker. The previous owner had laid cheap tiles directly on the ply which, to their credit, hadn't cracked in 4 years so it 'seems' solid.

I have some no more ply to go over it and the mega strength adhesive. Should I bite the bullet and change the floor?
 
As @Adey1980 states above our boards would be ideal. We recommend a thin layer of tile adhesive underneath, screw down with 12 x screws and tape the joints with an alkaline resitant tape.

I have attached our brand new installation guide here which may be of use.
You guide shows the wall board over plasterboard without joint tape.........
 
The picture may not show tape but point 3 'finishing joints' outlines that it is required.

Hope that answers any confusion!
Not really as your guide clearly shows that it isn't being used - it is either a **** up or it isn't really needed and if it is the former then your marketing department needs to look closely at details.

Hope that clears up any confusion with my observations.
 
The diagram doesn't show any joints and that's why you can't see the tape on the install picture. But it is there in the details and instructions.

Tape is required on all joints in all installations with HardieBacker.
 
Ok Tom I get what you mean now, I see you mean the actual picture showing the chap installing tiles not the diagram which I thought you meant.

So yes you are right thats an old picture and SHOULD show the tape over the joints.

Great spot and apologies over the confusion
 

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