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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • 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?

    • 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
    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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