Tiling onto chipboard?

[weirdfish]

Am I right in thinking that it's not advisable to tile directly onto chipboard, this is in the en-suite, and it looks like the water resistant type, ( slightly green in colour ).
The old tiles were stuck onto thin ply, but I had to take that up due to the amount of adhesive that was left on it, I suppose that might be giving me my answer, but just thought I'd ask in case things were different now, especially with new products.
The other reason is that we want to put down slightly thicker tiles, and it would create a very slight step if ply is required.

 

[Old Mod]

If u have room, glue and screw 6mm Hardibacker, simplist solution.
Prime floor, follow adhesive manufacturers recommendation
Stick down with same adhesive as you're going to use on floor.
Overlap joints beneath. Stagger joints on Hardie. Screw down and countersink screw heads.
Don't use Hardie screws, something like Turbo gold screws from screwfix.
Tape Hardie joints with a scrim tape, cover tape with tight skim of tile adhesive.

 

[weirdfish]

I did notice that product, but at 6mm it would create a real awkward step, if I have to overply, can I get away with 3mm ply, that way the difference in levels between bedroom and en-suite wouldn't be that bad.

 

[Old Mod]

Ply isn't a suitable product, it's still subject to expansion and contraction due to heat or moisture. The whole idea of using an inert material like Hardie is that these external forces will have no effect, thus giving u a stable substrate to tile to!

 

[Old Mod]

U could maybe use a little self leveller outside bathroom to lift carpet a few mm

 

[AliGage]

3mm ply will be as much use as wet newspaper.
Hardie us 6mm. A difference if 3mm to what your proposing. It's hardly a step.

 

[Dan]

A slight step with a good quality door transition is nothing these days. Can get over 20mm easily enough and not ever trip etc.

 

[mark1966]

Dittra mat stuck down with vs 45

 

[AliGage]

Dittra mat stuck down with vs 45

I've never understood why people choose ditra over timber instead of a backer.

 

[Ian]

I've never understood why people choose ditra over timber instead of a backer.

I've seen a couple of failed floors recently where ditra was used directly over chip board, granted I don't know what adhesive was used but, they had failed none the less. Only small bathroom floors, 3m max.