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    Rising damp coming through chipboard on concrete floor

    Guttering? You realise that the extension is single story, with a patio above, draining through through the nearest downpipe in gerneral view.
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    Rising damp coming through chipboard on concrete floor

    Adsy83, Not sure I get your meaning
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    Rising damp coming through chipboard on concrete floor

    Heres a sketch of where this all relates to the damp.
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    Rising damp coming through chipboard on concrete floor

    Upper region steps
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    Rising damp coming through chipboard on concrete floor

    and the drain at that point
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    Rising damp coming through chipboard on concrete floor

    Heres the steps I cut away
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    Rising damp coming through chipboard on concrete floor

    Here's the only dpc I can see
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    Rising damp coming through chipboard on concrete floor

    here
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    Rising damp coming through chipboard on concrete floor

    Heres a general view outside
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    Rising damp coming through chipboard on concrete floor

    Thanks for all your responses. To answer a few questions: The house was built in 1965 and the extension at the rear, of which this is part, in or around 1975. The extension is at a lower lever than the front of the house. At the area affected it's about 3-4 ft below ground. Although there are...
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    Rising damp coming through chipboard on concrete floor

    Mr Chibs, please read original post
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    Rising damp coming through chipboard on concrete floor

    The walls seem dry actually
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    Rising damp coming through chipboard on concrete floor

    Yes, the extension is lower than the house, and the area affected is in the most underground part. Yes, there is a drain close by, but the wall on that side seems dry. I had reputed local builders in, who drilled an inspection hole. They were of the opinion that the battens were added as an...
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    Rising damp coming through chipboard on concrete floor

    KenGMac, thanks for your comments, yes we do have a combi boiler, and it does need re-pressuring now and again, but there's nothing to suggest the pipes run under the concrete at this point. The house wasn't built by the local authority, this room and 2 others were built on as an extension, I...
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    Rising damp coming through chipboard on concrete floor

    I had no idea there was a problem until we had new carpets laid. The fitters alerted me to ugly black mold strains on the chipboard floor, mainly in one alcoved corner. The black mold seems to be mainly spreading out from where there are screws, which have gone rusty, and also on one edge next...
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