Kardean floor lifting

Discussion in 'Vinyl / Impervious floor coverings' started by Ricky, Apr 21, 2024.

  1. Ricky

    Ricky Member

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    Hi need some advice we have recently had lvt floor put down on top of underfloor heating. (Water) then screed over the top think it was arbitex that is mixed with a bottle so no water. The floor was layed with f48 plus adhesive what was recommended by the floor company. Since the heating has been on its not started to lift on all the joints. Any ideas why ?
     
  2. merit

    merit Well-Known Member

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    Did you have a rh test? Is it a new screed?
     
  3. Ricky

    Ricky Member

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    Sorry whats a rh test and yes it was a new screed
     
  4. dazlight

    dazlight Super Moderator

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    How long has the screed been down ?
     
  5. Ricky

    Ricky Member

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    It was down about 5-6 days before laying the floor
     
  6. Rugmunching

    Rugmunching Well-Known Member

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    The new slab with the UFH pipes buried, how long was that base down before the floorlayer screeded over it?
     
  7. Ricky

    Ricky Member

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    The ufh is the polystyrene squares thats you stick down on top of a wooden floor and the pipes push down in the runs. Then 5mm screed over the top of that
     
  8. Ricky

    Ricky Member

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    Its an overlay system
     
  9. merit

    merit Well-Known Member

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    Ah right. Whats beneath the overlay system?
    Heating is probably too high. Have you lifted a plank to see if its just the plank lifting or the levelling compound lifting with it?
     
  10. Ricky

    Ricky Member

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    There are floorboards below it, yeah lifted one plank and it looks like the adhesive hasnt stuck to the lvt its clean underneath
     
  11. Rugmunching

    Rugmunching Well-Known Member

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    5mm screed over the top of the boards?
    Could have done with a 10mm minimum and also sounds like the fitters didn't lay your planks in 'wet set'
     
  12. Rugmunching

    Rugmunching Well-Known Member

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    What's the name of your UFH system?
     
  13. Rugmunching

    Rugmunching Well-Known Member

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    Also what temperature have you been running the heating at?

    Did you raise the temp a degree a day or whack it straight up?
     
  14. merit

    merit Well-Known Member

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    Was it cold when the floor was fitted?
     

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