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Filling sub floor void with concrete

Discussion in 'General DIY' started by Steveb21, 4 Jan 2021.

  1. Steveb21

    Steveb21

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    I have a wooden subfloor in my 1950s bungalow - hate the cold drafty floor!

    I have some work starting soon for an extension and will have a vast amount of soil which i will need to dispose of. I am thinking I could use some of the soil to fill the existing subfloor to get up to a level to install a concrete slab.

    Currently not sure how much of a void i have but if i >

    Top up with soil > Grade 1 > Sand > DPM > Concrete > Insulation > Vapour Barrier > UFH > Screed

    Thoughts?

    Other options is to insulate between the joists with celotex or mineral wool
     
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  3. KenGMac

    KenGMac

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    Steveb21, good evening

    How much "crawl space" is there under the floor?

    Problem with infill is that you would really need to lift if nit all, certainly a lot of the floor, in your list of what is needed, you should add compaction of the reclaimed soil, and the Type 1

    it will be faster, and easier to insulate between the joists, provided there is a decent crawl space.

    Ken.
     
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