line across karndean

Discussion in 'Introduce yourself' started by sara, Oct 1, 2018.

  1. sara

    sara Member

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    hi there,

    we had an extension to the back of our house 12 months ago and karndean throughout (the existing and new part of the house downstairs). In the last two weeks this line has appeared where the new extension meets the old house and there is a ridge in the floor. A friend has said that the concrete floor has dropped and this will be a crack underneath. My question is how can this be rectified, whose fault is it and will it get worse if left? the karndean cost £3200 and was a installer from a showroom that stocks karndean. your thoughts would be much appreciated.
     

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  2. Spacey

    Spacey Super Moderator Staff Member

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    Is all the floor concrete or Only the new part ?
     
  3. sara

    sara Member

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    the new part is concrete, the old part was the existing house floor and it had carpet/floor tiles on. the old floor was slightly higher than the new but the floorer put down screed to level it off
     
  4. sara

    sara Member

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    so I assume the old part is concrete too?
     
  5. Spacey

    Spacey Super Moderator Staff Member

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    If you knock on the floor with your hand it will sound different if the old part is wood.
     
  6. sara

    sara Member

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    I have some photos of when it was being done that I will upload now
     

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  7. sara

    sara Member

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    the crack is alomg the line you can see I the first pic where the two floors meet
     
  8. sara

    sara Member

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    the old part is concrete not wood
     
  9. sara

    sara Member

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    here are some more pics
    I appreciate your help, thank you
     

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  10. Spacey

    Spacey Super Moderator Staff Member

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    Looks like the new concrete hasn't been stitched to the old and the floorlayer has just screeded over the transition without using any kind of crack repair
     
  11. sara

    sara Member

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    thank you for your advice. should the builder have done this or should it have been the floorer in your opinion?
     
  12. Spacey

    Spacey Super Moderator Staff Member

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    Well the builder shouldn't have left a gap like that between the two and the floorlayer should have known better

    It's possible to rectify to a point but there's no guarantee it won't show through again with the gap being so wide
     
  13. sara

    sara Member

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    ok thanks, not really sure who to go to first as I am guessing both will pass the blame to each other. I wish the floorer could have warned us though and then maybe we wouldn't have had the whole downstairs karndean'd for £3k. Is there a typre of flooring tha would work with this gap then or does the concrete floor need to be relaid? thanks for your advice.
     
  14. mjfl

    mjfl Well-Known Member

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    Hi, Can you remember if the new part had any insulation put in the floor before the subfloor was installed?
    Also, was the subfloor poured in or did the builder mix it up himself?
     
  15. mjfl

    mjfl Well-Known Member

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    It could be cellotex and gypsum, it could have dropped, seen it before!
     
  16. Spacey

    Spacey Super Moderator Staff Member

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    Could be but still shouldn't have screeded over that gap
     
  17. sara

    sara Member

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    The floor did have insulation put in to it and it was poured.
    Also looking back at the pictures it does look like a big gap but the black you can see is the ‘plastic’ membrane sticking up.
    Thank you for all of your opinions
     
  18. sara

    sara Member

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    45DD0E2E-1DC5-4D3A-BD66-A0A626591558.jpeg
     

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  19. sara

    sara Member

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    They used celotex boards and also some wire grids in the concrete floor I think
     
  20. sara

    sara Member

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    This is the floor after it was laid, the back of the house was then knocked out and this is where the line has appeared
     

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