Tiling over 22mm T&G chipboard

[Mark1979]

Hi,

I'm currently renovating and my next job is tiling. I have new T&G 22mm chipboard screwed down in the new living room extension on joists well above specification so it shouldn't move but it is chipboard so it might in time. I've now decided to install quartz tiles...

My understanding having taken a lot of advice is that I need to:

- prime the chipboard (with something like BAL Prime APD)

- Install hardi backer 6mm on a layer of 2 part flexible adhesive (no water) with 6mm trowel and screw down (taping edges per manufacturer instructions and staggering boards so joints don't meet)

- install tiles using a 2 part flexible adhesive (6mm trowel) per above

- use flexible grout (or epoxy grout)

I'd appreciate any comments you may have and also your suggestions for the 2 part flexible adhesive and grout/epoxy grout to use. Once it's done it'll be down 20 years so don't want to skimp or miss something and cause a later problem.

thanks in advance

 

[Flintstone]

Nearly right, the two part isn’t essential for under the hardie backer but won’t hurt. The trowel for sticking the tiles will need to be greater than 6mm, depending on tile size, 600x600 ? Then a 12mm would be better.
With regards to grout, regular flexible grout should be fine.

 

[Mark1979]

Hi

Thanks for the prompt response.

I'm not 100% sure yet but the tiles will either be 400 by 400 or 600 by 600. Would you still use a 12mm trowel for the 400's?

Are there any particular brands you'd recommend for the 2 part? or are they all much of the same?

Regards,

Mark

 

[Blunt Tool]

Mapei is readily available in most areas and very reliable.

 

[LM]

Personally speaking I’d opt for Schluter Ditra 25 uncoupling membrane stuck down to the chipboard with Ardex AF200 and then lay the tiles with a minimum C2 adhesive.
What are the dimensions of the area, have you considered expansion joints?

 

[Mark1979]

Personally speaking I’d opt for Schluter Ditra 25 uncoupling membrane stuck down to the chipboard with Ardex AF200 and then lay the tiles with a minimum C2 adhesive.
What are the dimensions of the area, have you considered expansion joints?

Hi Lee Mack, thanks for your comment.

The topic of expansion joints did come up at the start and I think we got to not needing them but I cant remember the detail of the discussion. The area is approximately 7 meters by 6 meters and I think I was told that I'd only need them if it was 8 meters in any direction. Does that sound right to you?

Regards,

Mark

 

[LM]

Hi Lee Mack, thanks for your comment.

The topic of expansion joints did come up at the start and I think we got to not needing them but I cant remember the detail of the discussion. The area is approximately 7 meters by 6 meters and I think I was told that I'd only need them if it was 8 meters in any direction. Does that sound right to you?

Regards,

Mark

I don’t know how but I’ve just realised that it’s a Quartz tile you’re fitting, don’t know how I missed that in the title at first 😱 Do what @Local has suggested.

 

[muddyfunkster29]

I would check with your supplier if the Quartz tile is ok to be fixed over underfloor heating. Some manufacturers don`t recommend fixing over electric ufh, I`m not sure whether the same applies to wet ufh.

 

[Mark1979]

I would check with your supplier if the Quartz tile is ok to be fixed over underfloor heating. Some manufacturers don`t recommend fixing over electric ufh, I`m not sure whether the same applies to wet ufh.

Hi Muddy - there's no underfloor heating

 

[muddyfunkster29]

I would go with Localtilers spec then mate. Crack on Sir!!!