Tiling on caber flooring on a new build

[brickyman]

Hi all. I am tiling a few floors for a friend on a new build. Is it ok to tile straight over caber flooring? Its well fixed down and i was thinking a thick coat of PVA and flexible adhesive and grout should do the trick. Any thoughts?

thanks

 

[stoner]

Hi, never heard of the term caberfloor but it looks like chipboard to me. Personally i would over board with 15mm wbp or tile backer boards. Big no no to pva also, always use acrylic primer for tiling!! Some have tiled on chipboard with no problems but it's not worth the risk.

 

[grumpygrouter]

DEF No to pva...it has no place in tiling. Much better to use a proper acrylic primer and definately overboard with a cement based backer board....as long as you have no deflection!

 

[brickyman]

there is not much deflection so was gona overboard with 9mm ply screwed every 150mm

 

[Ian]

9mm ply is too thin and will warp if it gets wet. Use 6mm hardie backer, much more suitable for the job.

 

[brickyman]

what ply thickness is best then

 

[jwatson]

15mm ply is british standard minimum. when over boading.

 

[Ian]

British standard is 15mm minimum.

 

[jwatson]

and screwed every 300mm or less. i screw 200mm personaly

 

[brickyman]

even if the floor is 15mm chipboard with not much bounce at all

 

[Ian]

Chipboard is probably the worst thing to tile to, except maybe sand, but seriously just get some backer boards, the job will last and be of a good quality and you won't have to go back and fix it when the tiles come loose, which they will if you tile on chipboard.

 

[DHTiling]

It is not just to do with deflection for the use of ply.. 15mm offers the best resistance to water ingression and BS5235 does state that is minimum to be used.

You can however *** said above use a backerboard like Hardibacker250.. these are water resistant and do not swell or leach resins like ply can..

 

[jwatson]

even if the floor is 15mm chipboard with not much bounce at all

yes even with the chipboard @ that thickness. layed staggered 2mm expansion gap between boards and primed back and sides

 

[brickyman]

so how do you get over the height rise outside that room where there is a carpet. Wouldnt it look funny?

 

[Ian]

You can get threshold strips to connect the 2. If you use a 6mm backer board you will find that the difference between the backer + tile and carpet + underlay, isn't that different.