Sloping concrete floor

Discussion in 'Eco Talk' started by mark lowry, Jul 2, 2018.

  1. mark lowry

    mark lowry New Member

    We have just bought a house which has a very noticeable sloping concrete floor. It drops by 2inchs into the corner. Is self leveling compound the best option or will I need to re screed it? Any advice welcome.
     
  2. KIAB

    KIAB Well-Known Member

    How large is the floor, is it sloping in just one small area, or will whole floor need leveling.
     
  3. mark lowry

    mark lowry New Member

    It dips in lots of places but the worst area is in the corner. It’s around 18ft by 12ft
     
  4. Astramax

    Astramax Well-Known Member

    Has the floor subsided?
     
  5. rogerk101

    rogerk101 Active Member

    It's hard for us to advise if we don't know whether it's sloping intentionally, through land movement, or just through bad workmanship. Perhaps it was built that way to get rid of water. Perhaps such a water problem no longer exists, so you can now level it out without concerns.
    If you do decide to level it, you should be willing to raise the overall level by 20mm above the current highest spot. 50mm is too thick for a self levelling screed, and the minimum thickness for a normal screed is 20mm, unless you're tiling, in which case you could possibly go down to 5mm.
     
  6. KIAB

    KIAB Well-Known Member

    There is deep set leveling compound now, which can do up to around 50mm in one pour, but you can build leveling up in layers, in the old days you use to add sharp sand to the compound to bulk it up for deep areas,there one SLC that still around & they still recommend adding sharp sand in the laying instructions..

    And prime the concrete floor with a acrylic primer before laying SLC.
     
    Last edited: Jul 3, 2018
    rogerk101 likes this.
  7. mark lowry

    mark lowry New Member

    No there’s no subsidence as we’ve had a full survey report it’s just a very old property hate to think what they used to level it? May a plough lol. So I can build the level up with levelling compound each level will adhere to each other? Just don’t want it cracked because of the thickness that needs to be raised. Is there any other method or is this the best bet with the best result?
     
  8. mark lowry

    mark lowry New Member


    No there’s no subsidence as we’ve had a full survey report it’s just a very old property hate to think what they used to level it? May a plough lol. So I can build the level up with levelling compound each level will adhere to each other? Just don’t want it cracked because of the thickness that needs to be raised. Is there any other method or is this the best bet with the best result?
     
  9. bodgitt&scarper

    bodgitt&scarper New Member

    If it's too much (pricey) for self levelling, you could screed with a decent mix with SBR and possibly some fibres, depending upon the load it needs to take. You can go pretty thin with an SBR enhanced mix.
     
    KIAB likes this.
  10. KIAB

    KIAB Well-Known Member

    A bonded screed,another who like adding fibres.
     

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