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Green Building Bible, Fourth Edition
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Housing - New Build: floor build up over concrete slab

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  1.  
    • CommentAuthorcremi
    • CommentTimeOct 5th 2021
     
    Hi there,
    I have an insulated concrete slab which I want to build up by 80mm.
    It is a passive grade house extension that I need to build up to match existing house floor level.

    I had originally laid battons on the concrete, then 18mm plywood as a sub floor. I had some water
    ingress from a hot water cylinder which resulted in mold build up to the underside of the plywood, which I have since removed.

    I am wondering whether to put in a screed or an insulated floating floor, such as kingspan panels. My floor finish will be 18mm engineered timbers.

    Will the Kingspan panels work in this case? I didn't use any DPM over the concrete slab initially, but I think the issue was caused by the un-ventilated void between battons (airtight building). By eliminating the void, will this prevent any future mold build- up?

    Thanks
    • CommentAuthortony
    • CommentTimeOct 5th 2021
     
    Need to ensure it has fully dried out first. Could just lay screed and let it fully dry, 25mm per month

    Engineered wood will need a substrate like sheets of t&g chipboard or ply
  3.  
    Cremi, presumably you could glue the eng board to the screed, rather than an additional layer of timber sheet?
    • CommentAuthorcremi
    • CommentTimeOct 6th 2021
     
    I probably would float it on an underlay. I think it's fair to say there is no need for the additional sheet- the eng. boards are 20mm depth.
    So, the screed seems to be the preferable option.

    Thanks for comments.
    • CommentAuthortony
    • CommentTimeOct 6th 2021
     
    Yes, so long as it is fully dry

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