Badly installed tiles

[MrsSilenceDogood]

Thanks, everyone. I agree with Iwilldoit. Those squares that look like tiles underneath are the imprint from the back of the tile. I think he is also right that the movement in the chipboard is causing the issue along with a failure to use flexible tile adhesive.

 

[MrsSilenceDogood]

Am very keen to put tiles again, so scraping off the adhesive, adding tile backer board and re-tiling. My concern is that this will lead to a difference in level with the floor in the bedroom. Is there a solution to this?

 

[Nige F]

Poster #10,

The small squares are are obviously not impressions from the undersides of the larger tiles.

what are they then , Sherlock ?

 

[Iwilldoit]

Am very keen to put tiles again, so scraping off the adhesive, adding tile backer board and re-tiling. My concern is that this will lead to a difference in level with the floor in the bedroom. Is there a solution to this?

First screw down the original floor better, then screw on the backer board to within an inch of its life not sure if the backer will need a primer coat of something like this then use flexible adheasive - butter the back of the tile as well.
And no there is no other way and yes you will end up with a difference floor height.

Consider this -when you screw down the floor properly you may end up screwing through pipes or cable, then beings that its a bathroom you may need to get under there at some point for maintenance. I really would not put tiles down again. Good old lino - easily put down - easily changed if you get bored of it - warm to the feet. Same goes for plastic waterproof laminate although I am not sure if that can go straight onto your chipboard floor.

 

[foxhole]

Once you have removed all you may have to accept that they cannot be relaid is you cannot remove all the adhesive.They should ideally be laid under any sanitary ware.

 

[MrsSilenceDogood]

What about removing the chipboard and putting down marine ply, or is it possible to just put down tile backing board?

 

[Iwilldoit]

There is something else that you could use on top of your chipboard - a decoupling membrane which is thinner than backer board.

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[MrsSilenceDogood]

That's a great idea. My one thought is maybe easier to just replace the chipboard with something else rather than trying to remove the adhesive. Any thoughts?

 

[Iwilldoit]

That's a great idea. My one thought is maybe easier to just replace the chipboard with something else rather than trying to remove the adhesive. Any thoughts?

Depends on the age of the house but the chipboard could also be glued down or at least it will be a T and G board - it will be a nightmare to get up, you will wish you never started, the loo and everything will have to come out - all the plumbing isolated.
You should be able to get off all the old adheasive, last remnants can be done with a hand Stanly blade scraper.

 

[MrsSilenceDogood]

Thank you so much, Iwilldoit. I now know exactly what to do. This has been invaluable.

 

[Iwilldoit]

Your floor could be like this, but with the tiles and grout cracking it suggest that the floor is not glued down, could even be nails which become loose as the joists dry out - screws are better

 

[MrsSilenceDogood]

Damn, if they've done that, that ain't ever coming off

 

[Iwilldoit]

You are opening yourself to a whole world of pain to redo the tiles properly so that you will not be having to re do them again - just replace with lino (vynal) or plastic laminate.

 

[IJWS15]

I would never lay tiles on Chipboard, even marine ply needs much more support than standard joists give.

If you want tiles then start from scratch with cross members between the joists, marine ply in place of chipboard then tile with flex adhesive - and even then the slightest mistake in process will mean they still move.

You may need to change the chipboard anyway as the adhesive is unlikely to come off without affecting the surface of the chipboard and most of the strength is in the outside faces (densest part) of the board.

I would use sheet vinyl over 5/6mm ply.