Shallow Flooring screed help. Solid + bitumen DPM advice.

Discussion in 'Builders' Talk' started by Al man, Apr 20, 2021.

  1. Al man

    Al man New Member

    Hi there

    Hoping you can help please!!! Soriy if this is the wrong forum for this. We have a solid floor in a lounge/ dining room. We have had the old screed broken and removed and a firm laid a new "synthaprufe trade" bitumen dpm down on the concrete slab underneath.

    The flooring isn't level from the concrete slab underneath and results in dips and bows in certain places. We were originally advised to put a sand/cement screed across it all to smooth it out but have been told now that the depth in some areas is not enough for the at least ~50mm depth required for that type of screed.

    Any advice for what is the best approach to ensure both a level but also a suitably resilient floor which is suitable for shallow depths and also a solid base and butumen dpm please??

    We plan for there ideally to be underlay and a carpet laid eventually when it dries but would consider another flooring if it made sense given the approach for the above.

    Obviously cost effective options welcome but interested in the recommend approach.


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  2. Jord86

    Jord86 Screwfix Select

    Liquid screed but it would be cost prohibitive or look at a deep base self levelling compound.
  3. DIYDave.

    DIYDave. Screwfix Select

    Blimey, what a mess

    2 coats of SBR diluted as per manufacturers spec / probably 1-4 water. This will aid adhesion for the next later

    Self levelling compound - Mapei Ultimate is quality, designed to be laid over concrete floors, can be poured as thin as 1mm up to 10mm max in one go, subsequent layers can be added once cured

    Not to be used as a final floor finish but perfect in your case when flooring is being laid over

    That’s one option
  4. Al man

    Al man New Member

    Thanks Dave - so with this would we need anything special to sit on top of the Mapei Ultimate before the underlay/carpet went on top?
  5. Al man

    Al man New Member

    Thanks any manufacturer recommendations? Would it be Mapei Utlimate as per daves post,
  6. DIYDave.

    DIYDave. Screwfix Select

    Hi Al Man

    As common with ‘most’ self levellers, they’re not designed to be used as the final finish - although there are SL that perform both tasks - levelling and providing a final surface

    But in your case, the SL can then be covered with carpet, laminate, tiles, etc,

    In your case, underlay and carpet so all good, nothing else to add over the SL

    Also look at NX Leveller from BQ and also Wickes one seems to get good reviews

    As ever, go for a quality product but shop around for price if this is an important factor

    SF sometimes has bulk offers on the Mapei giving an unbeatable price - worth checking

    I believe that some SL can go direct over bitumen layers with no additional bonding coat but not 100% on which ones (but I’m thinking maybe the NX above but please check first)

    Good luck with the project
  7. Al man

    Al man New Member

    thanks so much for your help!! Really appreciate it :)

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