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Best way of levelling concrete hearth with chipboard subfloor?

Discussion in 'Floors, Stairs and Lofts' started by SJRSJR, 22 May 2018.

  1. SJRSJR

    SJRSJR

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    Hi. I'm about to lay new laminate flooring in the living room. There's a 4mm ridge where the concrete hearth plinth meets the chipboard subfloor and I'm wondering what I should do.

    Under a previous laminate floor I packed it with extra underlay (just the basic 2mm white foam type) but there was a slight bounce so I'd like to do it better this time. It's only the long edge, the other two sides are fine.

    Would a better quality underlay help, should I try and grind down the edge or is there some sort of screed that can be applied to chipboard? Thanks

    hearth 1.JPG
    hearth 2.JPG
     
  2. SJRSJR

    SJRSJR

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    So now I'm thinking that the best way might be to break up the hearth area and start again with a self levelling compound?
     
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  4. oldbutnotdead

    oldbutnotdead

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    You've probably done the job by now but just in case....if you can afford to lift floor level by 4mm then use the green fibrous underlay (6mm) in the room & put 2mm on the hearth.
    Plan B would be investigate the hearth- if you're lucky it'll be 25mm of concrete on top of earth and rubbish- easy to break out, bit of hardcode and sand, DPM, screed, done. If you're unlucky and it's a full thickness proper job then time for messy grinding (shabby, timeconsuming but cheap trick is anglegrinder, diamond discs and fettle it away CAREFULLY with full face eye protection).
     
  5. bobasd

    bobasd

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    whats wrong with priming the hearth and laying SLC to meet the c/board level?then use whatever underlay across a level floor?
     
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  7. oldbutnotdead

    oldbutnotdead

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    I think the floor has sunk relative to the hearth- tricky to tell from the pics- if its the other way round then yes SLC on the hearth would def be the easy fix
     
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