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  1. #1
    Join Date
    Nov 2007
    Location
    Sydney
    Posts
    25

    Default raising floor level

    Hi all

    I have research this problem before, but am still a bit lost with what to do.

    I am in the middle of a kitchen reno, half the kitchen is yellow tounge particleboard, half is a concrete slab. The particleboard is 16mm lower than the concrete floor. I intend to tile over the top of both these floors.

    What is the best way to raise the level of the lower floor? also will i need an underlay for the concrete floor? it is in the best of condition

    Any help is appreciated

  2. #2
    Join Date
    Jan 2002
    Location
    Melbourne, Aus.
    Age
    71
    Posts
    0

    Default

    Best guess FWIW: lay another layer of chipboard over the other and even the lot up with Ardit.

    That said, the butt join may be a problem. Do an expansion joint with polyurethane sealant perhaps.

    You can tile on concrete if it's in good nick; may need to seal it first though so the adhesive gets a good bond.
    Cheers, Ern

  3. #3
    Join Date
    May 2007
    Location
    mayland W.A
    Posts
    137

    Default

    hi damo

    i had a similar problem i removed a wall to create my new kitchen and was left with a 9m2 concrete slab from the old laundry ,

    is it possible to get under the house and see if the slab is suspended or how thick it might be . if you are only talking 16mm it might be a lot easy in the long run to get hire a concrete planer and remove 16mm from the top of the slab .

    i ended up removing the hole slab and laying new floor bearer ,joists and boards a very long job .
    best of luck
    rob

  4. #4
    Join Date
    Aug 2006
    Location
    Sydney
    Age
    65
    Posts
    1,248

    Default

    It Jags suggestion of removing the slab is unpractical you would be best putting tile underlay across the lot - Bridge the join with the underlay and using battens over the yellow tongue to level it.

    Otherwise you will get a crack across the horizon at the edge of the slab.

  5. #5
    Join Date
    Jan 2002
    Location
    Melbourne, Aus.
    Age
    71
    Posts
    0

    Default

    Aren't we sposed to have expansion joints now anyway in tiled floors? Every x metres or somesuch.
    Cheers, Ern

  6. #6
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
    Posts
    3,208

    Default

    Battens won't support underlay adequately.
    I'd put a layer of 16mm waterproof construction ply over the yellow tongue and then sheet over all of the concrete and timber sections with 6mm cement sheet. With no cement sheet joins in the proximity of the concrete/timber join.
    Regards, Bob Thomas

    www.wombatsawmill.com

  7. #7
    Join Date
    Feb 2008
    Location
    sydney
    Posts
    33

    Default

    Quote Originally Posted by echnidna View Post
    Battens won't support underlay adequately.
    I'd put a layer of 16mm waterproof construction ply over the yellow tongue and then sheet over all of the concrete and timber sections with 6mm cement sheet. With no cement sheet joins in the proximity of the concrete/timber join.
    I would add to this that if one sheet will cover your floor, and you're worried about subfloor/'part of the subfloor' movement, then use a semifloating thicker sheet of (I assume Bob) compressed cement sheet, instead of the 6mm.

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