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Does Flowscreed have a scum layer and then a latent below?

  1. Yes

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  2. No

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LVT Latent / scum removal advice

Discussion in 'Subfloor Preparation' started by Selfbuilder, Jan 25, 2020.

  1. Selfbuilder

    Selfbuilder New Member

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    Hello,

    I am arranging for a contractor to install LVTs however I have received inconsistent guidance re latent removal.

    The LVTs will be fitted on an anhydrous flow screed with underfloor heating.

    The flow screed was poured October last year. A few days after pouring I scraped the surface with a plastered scraper and removed a thin smooth scum (less than 1mm) to reveal a more buff surface.

    some of the contractors have said they will prime what is there, add self leveller and lay the floor. However one contractor has said the layer I scraped off is just a scum (not the latent). The latent is still the top layer of screed and will need further grinding to guarantee the floor not to fail.

    is this contractor correct, so flow screeds have a smooth scum and also a latent under that which is harder but still needs removing?
     
  2. brenchy

    brenchy Well-Known Member

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    normaly it would be ground back until you can see the aggregate in the screed and all the latence is removed
     
  3. Rugmunching

    Rugmunching Well-Known Member

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    Needs a good machine on it, take no chances
     
  4. Distinctive Adam

    Distinctive Adam Well-Known Member

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    Spin it off, leave it a bit then crack on with prep, job done,
     
  5. d'Arcy

    d'Arcy Well-Known Member

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    How much lignite is visible in the aggregate?
     
  6. coolevilangel

    coolevilangel Well-Known Member

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    Grind back till solid aggregate is exposed then prime and screed away
    If any company ho specialise in this don’t own/use a grinder then point them to the door as they chancers
     
  7. coolevilangel

    coolevilangel Well-Known Member

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    Eh?.... who’s mentioned lignite? It’s A/H so won’t contain it
     
  8. d'Arcy

    d'Arcy Well-Known Member

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    So, we had to deal with some Tarmac Thermio that a builder had put down recently. Anhydrite... Full of lignite...
     

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