Prep for bitumen concrete floor

Discussion in 'Subfloor Preparation' started by Rocks100, Apr 17, 2024.

  1. Rocks100

    Rocks100 Member

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    Hi, just have a follow up question if you don’t mind.

    So ended up going with Ardex NA with the course aggregate.
    It’s gone ok but due to extra viscosity of the aggregate and the depth of the pour some areas haven’t turned out as level I would like to once we finished the last room we intend to add a very think layers on the areas that need a bit more levelling however we really afford anymore Ardex NA so want to go with a water based option for the thin top, if we primed with SBR would it be ok to use something like Mapei ultra plan just for this thin layer?

    Many thanks!
     
  2. J d clarkson flooring

    J d clarkson flooring Well-Known Member

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    Defiantly don’t do that….. only thing you can go over n/a with really is n/a….. if you go over it with a water mix as it dries it’s stronger than the n/a it could rip it off the floor as it dries
     
  3. Rocks100

    Rocks100 Member

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    Ah ok, appreciate the info, good to know
     
  4. Rocks100

    Rocks100 Member

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    Hi, can anyone please recommend best option for a think foam/rubber sound proofing layer to go between self levelling and 14mm engineered floor, the substrate under the levelling compound is concrete.
    The thickness of the soundproofing layer can be between 5mm to 10mm max.

    There are quite a few options of different rubber or foam options but it’s difficult to ascertain which is best value and if for example 8mm will make much improvement on a 5mm layer etc..

    Many thanks!
     
  5. tarkett85

    tarkett85 Well-Known Member

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    You can’t soundproof like that, to actually soundproof you need mass and lots of it up to a metre thick (that’s the length of some bass frequency waves) and full decoupling from your walls, what exactly are you trying to do stop transit sound or sound from below and what frequencies are you trying to prevent (you’ll want to take acoustic readings to find that out) it gets complicated and expensive depending on your needs.


    Sent from my iPhone using Tapatalk
     
  6. Rocks100

    Rocks100 Member

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    Hi, thanks for the reply.

    To be honest I’m not too worried about mass as it’s a concrete floor with extra 2cm of levelling compound added, we just need to add a bit of extra impact protection for the apartment below as the floor is changing from carpet to engineered wood floor, we have max of 10mm available due existing skirting height.

    thanks!
     
  7. tarkett85

    tarkett85 Well-Known Member

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  8. Rocks100

    Rocks100 Member

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    Hi, can I also ask does Ardex NA require a liquid DPM barier (e.g. Sika dpm) before laying sound proofing over it or does it have damp proof properties in it?

    Many thanks!
     
  9. Rocks100

    Rocks100 Member

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    That’s great, appreciate the advice, many thanks!
     
  10. merit

    merit Well-Known Member

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    Ardex NA is moisture tolerant but does not have any damp proofing properties
     
  11. Rocks100

    Rocks100 Member

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    Understood, thanks again!
     
  12. Bomberwa

    Bomberwa Member

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    Hey! If moisture isn't an issue, an SBR primer should work fine over bitumen. Water-based SLC can be okay, but latex might give better results. Sika DPM is a solid choice if you're budget-conscious. Good luck with the project!
     
  13. dazlight

    dazlight Super Moderator

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    100% never use a water based compound over bitumen as it won’t work.
     
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