Tile straight onto 22mm CABERBOARD bathroom floor ?

[Post and beam]

Our new build has Caberboard 22mm fllor on the first floor. It is very flat and strong with zero bounce. I cannot see why i need anything under it before i tile it. Am i being an idiot or is this a simpe thing please?

 

[JohnMo]

Caberboard is water proof with a coating, I would be worried about the adhesive just lifting after a short while. So you may have to do something to act as medium to allow a sound connection. Maybe an overlay of ply or something similar?

 

What do the caberboard instructions or website say on the subject?

[nod]

1 hour ago, Post and beam said:

Our new build has Caberboard 22mm fllor on the first floor. It is very flat and strong with zero bounce. I cannot see why i need anything under it before i tile it. Am i being an idiot or is this a simpe thing please?

 

Nothing to stop you 

Some of the building companies that I tile for are to tight to pay for crack matting 

[Post and beam]

27 minutes ago, nod said:

Some of the building companies that I tile for are to tight to pay for crack matting 

Thanks Nod.

 

The Caberboard is glued to the joists below and 100% around on every mating side and screwed down. I cannot imagine its ever going to move.