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Problems with karndean

Discussion in 'Vinyl / Impervious floor coverings' started by Carys, Mar 24, 2015.

  1. pf flooring

    pf flooring Well-Known Member

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    You can force dry anhydrite with ufh, I think it drys more like a smoothing compound than a typical slab.
     
    pf flooring, Mar 24, 2015
    #21
  2. mjfl

    mjfl Well-Known Member

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    Just so it's clear...
    It's not the slab that need's taking up, just what the installer has installed...:thumbs
     
    mjfl, Mar 25, 2015
    #22
  3. Lvtman

    Lvtman Well-Known Member

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    Unfortunately it sounds like it all needs to come up.

    The laitence needs to be ground off it it hasn't and then an acrylic priner used. If he's used a green primer made by fballs then he needs to use there blue acrylic one. You need to know what latex he has used aswell as most are not suitable for anhydrate.

    You also need to make sure it's dried out properly. Good luck
     
    Lvtman, Mar 25, 2015
    #23
  4. coolevilangel

    coolevilangel Well-Known Member

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    Keep us posted on the outcome :)
     
    coolevilangel, Mar 25, 2015
    #24
  5. Carys

    Carys Member

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    Will do. Thank you all for your comments
     
    Carys, Mar 25, 2015
    #25
  6. Matt

    Matt Well-Known Member Staff Member

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    these cracks in the door ways. Is the actual Anhydrite cracked under the smoothing compound?
     
    Matt, Mar 26, 2015
    #26
  7. Carys

    Carys Member

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    Yes it is.
     
    Carys, Mar 26, 2015
    #27
  8. Carys

    Carys Member

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    Installer has scraped the surface of the anhydrite before priming.
     
    Carys, Mar 30, 2015
    #28
  9. Spacey

    Spacey Super Moderator Staff Member

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    Scraped ? With what ?
     
    Spacey, Mar 30, 2015
    #29
  10. Carys

    Carys Member

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    Some tool with a type of blade on it.
     
    Carys, Mar 30, 2015
    #30
  11. coolevilangel

    coolevilangel Well-Known Member

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    So not with an electrical mechanical diamond grinder, as recommended?
     
    coolevilangel, Mar 30, 2015
    #31
  12. Spacey

    Spacey Super Moderator Staff Member

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    He may have had a spare week to kill ?
     
    Spacey, Mar 30, 2015
    #32
  13. Carys

    Carys Member

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    No habd held but says it does the job and not as messy.
     
    Carys, Mar 30, 2015
    #33
  14. Spacey

    Spacey Super Moderator Staff Member

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    No it definitely doesn't do the job
     
    Spacey, Mar 30, 2015
    #34
  15. Spacey

    Spacey Super Moderator Staff Member

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    That's means he doesn't have the gear to do it
     
    Spacey, Mar 30, 2015
    #35
  16. Cre8tiveflooring

    Cre8tiveflooring Well-Known Member

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    All the gear no ??????
     
    Cre8tiveflooring, Mar 31, 2015
    #36
  17. Spacey

    Spacey Super Moderator Staff Member

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    grapes
     
    Spacey, Mar 31, 2015
    #37
  18. Matt

    Matt Well-Known Member Staff Member

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    o.k, reading whats going on here, i think there is two issues. (im guessing tho as not seen the job in person)

    1- was not prepared correctly, not ground and wrong compound maybe?
    2- Subfloor not at correct thickness and unstable as door ways cracking? or heating running at different temps in different zones with no expansion joints maybe ?
     
    Matt, Mar 31, 2015
    #38
  19. Carys

    Carys Member

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    Different heating zones and lack of expansion joints may well be cause of cracks under doors. However not sure if cracks are bad enough that they woukd cause primer and karndean to lifft off subfloor??
    F ball say their green primer is fine for anhydrite subfloor although blue is specifically designed for it.
    Having box fitted to floor at the moment to measure moisture to rule this out first
     
    Carys, Mar 31, 2015
    #39
  20. Spacey

    Spacey Super Moderator Staff Member

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    If the laitance isn't mechanically ground from the top it will fail every time regardless of any other prep & also a hydro box will not necessarily give a true moisture reading. Did your installer do a carbon bomb test ?
     
    Spacey, Mar 31, 2015
    #40
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