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Leveling an upstairs (timber) subfloor for spc vinyl planks

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  • 21-11-2023 7:47pm
    #1
    messinkiapina
    Registered Users Posts: 2,158 ✭✭✭


    My upstairs landing floor dips by about 9mm over the space of 2 planks. So basically a have one area of floor that's 9mm higher than the remainder, both of these areas are flat and are separated by 2 sloped planks that join those areas. I hope that makes sense!

    Lifting the boards and raising the joists is beyond my skill level. Is it possible to get a self leveling compound that can be used on upstairs floors?

    I was thinking of laying a 3mm sheet of hardboard over the lower area, seal any gaps with silicone, and pour a leveling compound on that. Would that work or are there any better ways to tackle it without lifting floorboards?



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    #2
    embracingLife
    Registered Users Posts: 400 ✭✭embracingLife


    For laying leveling compound on porous surfaces including on timber it's best to put a primer before pouring the compound. Generally it'll say on the bag what sort of primer to use.

    And there's a fast setting compound too so it will dry faster than standard compound.

    Post edited by embracingLife on


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    #3
    mickdw
    Registered Users Posts: 23,264 ✭✭✭✭mickdw


    There is high build levelling compound that will fill the entire height difference for you.



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    #4
    whizbang
    Registered Users Posts: 1,924 ✭✭✭whizbang


    Trying to bucket in and pour compound upstairs in a living house is a recipe for disaster.

    Not going to work anyway, theres just going to be too much movement in the floor on a landing.

    bite the bullet, Get a smart old handyman in to lift the boards and trim or build up the joist, and then 9mm ply and a few nails is all is needed.



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