green chipboard floor help

[doug boardley]

I'd be thinking of removing the chipboard and tiling onto the concrete, maybe using something like weber floor flex to build up the concrete to desired height.

 

[andypar]

thanks doug , but unfortunatly i have 90mm insulation with 90mm x45 joist screwed down to the concrete ,

 

[Rich]

Is there any chance of replacing the chipboard with ply?

 

[andypar]

not really rich , i think i will sand the chipboard a bit and make a key and seal it ,then try a test area, use the matting and hope, now it is whether to tile under the kitchen units or not hmm, i was going to, but now am wondering if that would be such a good idea.

 

[Gall.B]

i think i will sand the chipboard a bit and make a key and seal it

Remember Andy no PVA, a good primer

 

[andypar]

thanks gall, i was thinking of mapei prim t ,unless there is another that anyone can recommend or would mapei primer G be better, thanks, Andy

 

[Gall.B]

I like to stick to the same brand as the addy, Either Weber, Mapei, Bal or Ardex.

What is the meterage of the floor Andy?

 

[andypar]

40m2 gall,thanks

 

[Bathfix Bob]

I take it the height issue is due to UPVC french windows or something, eg that cannot be planned?

UPVC bi-fold door??

 

[andypar]

yes Bob, and a low threshold door which opens inwards, if only the mrs would settle for linol

 

[Gall.B]

You will need expansion joints if the floor runs anymore than 4m in any direction Andy.

 

[One Day]

You can use Ditra or Dural Ci+ Stuck down with an S2 adhesive, then tile with a suitable adhesive for resin bonded tiles.. I'e.. Mapei Granirapid or Elastorapid..are 2 good ones..

Advice is good Dave and certainly something I would do, but I reckon you'll find Schluter would say no to using Ditra on P5 boards.
They also say use of an S2 adhesive to bond the Ditra cancels out the effect of the membrane. Should always be an S1. Bizarre I know - but true.

A good non flexible addy with a flexible admix will replace approx 50% of the water used in the mix. Resin bonded tiles are susceptible to twisting with too much water.

 

[andypar]

thanks gall, yes it runs 8.6m so i would have to put 2 in or would i get away with one

 

[andypar]

thanks impish, i have a bit of thinking on what to do now

 

[Rich]

You should only have to install an expansion joint every 4 or so M if the tiles are fixed over under floor heating, usually around every 7-10M. Not that it would do any harm to add more.