Why are my floor tiles lifting

Here you are:

  • Is there more information?

    Hello Armin,
    you have to provide more detailed information.
    What is the substructure made of? (Take a tile out of the middle)
    Is there a moisture ingress from somewhere?
    A "logical" explanation could initially only be that there was flow on parquet flooring and that was expanded by the action of moisture, which leads to the bulging in the middle of the room.
    greetings
  • Info

    Hello Mr. Thomas Haas,
    we are in the process of removing the tiles that have been set up because of the kids.
    Regarding the question: the substrate is a screed. I laid the tiles back then ... it was about 7 years ago ... even laid.
    It was a new building ...
    I check humidity regularly ... around 30% today because the weather was nice and the door stayed open longer. Otherwise around 35% RH.
    greeting
    armin
  • ps

    took photos ... if of interest I can email them.
    Kind regards
  • Thank you, aaaber .....

    Hello Armin,
    ... sorry, but I couldn't do anything with the photos as I only have a little experience with wooden beams / floors in the very old old building. So screed stories and their capers are largely beyond my knowledge.
    As someone who is generally interested in construction, I am looking forward to hearing from others. Something must either suddenly push from the sides or from below. But what?
    greetings
  • a lot of (seemingly unimportant) information is missing

    Hello,
    • what a screed
    • what room size, geometry
    • Position of the joints (if any)
    • Moisture of the screed (not relative room humidity) at the time the tiles were laid and now
    • what kind of glue (flexible glue yes or no) was used
    • is there still screed residue on the adhesive / tile or has the tile loosened from the adhesive?
    Let's see if it is possible to isolate the damage from a distance. The exact cause can only be determined on site.
    My first guess would be
    • The screed was too damp when the tiles were laid
    • strong shrinkage due to drying out and setting processes
    • the resulting tension build-up at the screed / adhesive boundary
    • sudden failure (possibly caused by New Year's party - not caused)
    In that case, it would have to be a relatively large room where no joints were built in and the tile would have to be torn from the screed with adhesive.
    With best regards
  • can be clarified ...

    Hello Volker,
    First of all, thank you very much, I will try to clarify all questions ...
    only in advance if something is wrong there, why all this (we did the math yesterday) after 8 years? The assumption I (as a layman) mean is that the kids, who are currently rubbing the bobby car again, have loosened the tiles where there was tension anyway, but why only after 8 years?
    For now I can say that the screed slab has an expansion joint towards the hallway, which I also kept with the tiles.
    The room size is approx. 7 x 5 m.
    Basement on the ceiling no cracks! (Was only the assumption)
    The tiles approx. 300 x 300 are laid diagonally to the room.
    Unfortunately, I cannot measure moisture from the screed. The rel.
    Room humidity as mentioned above is approx. 30 - 40%.
    Most of the glue has peeled off the tiles. (Has been tiled directly on the screed)
    Adhesive: PCI-FT adhesive mortar
    I hope the information helps to determine the damage.
    Greetings Armin
  • now suspect processing errors

    Hello,
    Since the adhesive has loosened from the tiles, the adhesive / screed bond seems to be in order. The room size 7 * 5 m (35 m²) is also in the range of the normal.
    Tension has built up over time, which is perfectly normal. Due to processing and / or material errors in the adhesive (possibly also in the tiles), these tensions could no longer be absorbed and there was a bang. The load from the use has done its part. Perhaps there are also influences from underfloor heating.
    After 8 years you don't really need to think about the question of guilt, especially since the transfer was done on your own.
    Clean the surface, prime if necessary and re-tile. Secretly annoy yourself and debit with experience.
    This damage is unlikely to occur again.
    With best regards
  • Tiles stand out

    Hello,
    For me there is only one explanation: missing edge joint. Know similar cases. During the renovation, pay attention to a functioning edge joint, do not exceed the application times for the adhesive, then it will work.
    Greetings Frank
  • so right ..

    I don't get it yet.
    The tiles are fixed on a base plate. Edge joints are available. If it had been the edge joint, the tiles would also be loose at the edge. It wasn't. The tiles jumped exactly in the middle diagonally to the room (tiles also laid diagonally). The screed shows (as far as I have seen) no cracks, because if something expands it contracts again so that cracks should be visible.
    The only explanation for me is that the whole thing is always under tension. The Bobby Car was the trigger, because all the tiles have been shaken off, and whoever has children knows what energy is in there ) (So bobby car canceled).
    Well ... we were on further inputs
    Greetings Armin
  • new experience

    finally found the time to partially remove the tiles or its adhesive.
    And lo and behold! The screed has a full crack across the living room.
    Then it is probably not the tiles and their processing but the substructure.
    One learns from this: Never again a house from a cheap general contractorA. buy or have made!
    greeting