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Discuss Who can identify the problem here? Crazy paving tiling - dodgy subfloor? in the Tiling Forum area at TilersForums.co.uk.

  1. James stibbs

    James stibbs New to TilersForums.co.uk

    Location:
    Sussex
    Following some cracked grout and then cracked tiles, I've lifted a couple of tiles in my bathroom this morning to find what you can see in the photos.

    I'd like to re-lay replacement tiles but with the subsurface you can see, I'm not sure it's a good idea. The light blue you can see is like a hard foam. The dark blue is more like a hard plastic. Below this is some underfloor heating. Can you give me some advice on how to proceed? Can I just re-lay or is this a cowboy job and do I need to get this up and lay a new subfloor (something I really don't have the time or money to do).

    If I can re-lay, I guess I'd need to take the adhesive up, which is going to bring the foam up. Do I replace it? If so, what is it? Thanks in advance for any help you can provide, tiling community. IMG_20181013_092612.jpg IMG_20181013_092612.jpg IMG_20181013_092624.jpg IMG_20181013_093646.jpg
     
  2. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Yorkshire
    Is this a solid floor or timber floor ? It's not looking promising for an easy repair. There's been some movement and thermal shock by the looks of it allong with poor fixing. What is the dark blue ?
     
  3. James stibbs

    James stibbs New to TilersForums.co.uk

    Location:
    Sussex
    Hey LocalTiler,

    On closer inspection, it turned out that the dark blue is the heating element from the underfloor heating...

    Underneath it all is a timber floor.
     
  4. hmtiling

    hmtiling Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Isle of Wight
    Looks like uncoated xps boards. If this is on timber with ufh then a rip up methinks.
    Are there cracks in the grout on the rest of the floor?
    By the look of the adhesive the tiles haven't been back skimmed so you may be able to salvage them
     
    • Agree Agree x 1
  5. Localtiler

    Localtiler Trusted Advisor Professional Tiler JOTM Winner Top Contributor

    Location:
    Yorkshire
    The light blue is uncoated board but the dark blue ? There looks to be a crack under the board too?
     
  6. James stibbs

    James stibbs New to TilersForums.co.uk

    Location:
    Sussex
    @Localtiler@Localtiler After a bit more archaeology, the dark blue is the plastic cover of the underfloor heating element. In this photo, you can see that some of the cracks follow the loops of the element. And yes, there is a crack under the board too. Good spot.Without pulling it up, I can't see if it's extensive or not. What's your diagnosis?

    @hmtiling@hmtiling yes, most of the grouting is now cracked. Is it usual to set the ufh within the adhesive like this?

    IMG_20181013_134456.jpg
     
  7. Andystiletiling

    Andystiletiling Professional Tiler

    Location:
    Burnley
    Think the dark blue are the cables Andy..
    Poor prep..all up and start again I'd say :(
     
    • Agree Agree x 3
  8. Chalker

    Chalker Trusted Advisor Professional Tiler JOTM Winner

    Location:
    Tadcaster
    They have used uncoated insulation boards. Nothing sticks to them, so the adhesive is just floating. Then the ufh may have been switched on too early, or too hot.
    Tiles haven’t been back buttered. So at least they might come up easily.
    Unfortunately, will need ripping up and starting again.
     
  9. Waluigi

    Waluigi Professional Tiler Top Contributor

    Location:
    UK
    It’s either a family of cement eating ants living nearby or some idiot tiled onto some bare XPS. Crazy.
     
    • Agree Agree x 1
  10. James stibbs

    James stibbs New to TilersForums.co.uk

    Location:
    Sussex
    Thanks to everyone who responded. I greatly appreciate it, even if it wasn't the news I wanted!
     
    • Like Like x 1
  11. widler

    widler Professional Tiler

    Location:
    England
    Shower tray/screen leaking as well
     
  12. Protiler 68

    Protiler 68 Professional Tiler

    Location:
    South east/kent
    Tiling onto foam ,really
     
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