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If a bellcast is applied and newly plastered up to (and just above it)... would the lower part of the wall plaster below the Bell Cast, always remain damp and look damp right up to the bottom of the Bell Cast? Is there any way to stop it from looking damp, or retaining damp? Also as an...

Sorry tell80, there are no water stains on the inside wall, therefore there's no point in showing any inside pic. The inside wall had insulated plasterboard applied, which will have a vapour barrier, so it likely wouldn't show through anyhow, even if there was any damp on the inside wall. The...

Yes, that's a good place to look but new roof and guttering were only put on about a year or two ago also and all good there, no problems. It's an odd one.

No John, no water meter. I know it seems logical to think that it's being caused by a water mains leak but I really don't think it is.

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John, it's buried in. Essentially sitting within the insulation between concrete subfloor and screed layers. Obviously there might be a very, very, small chance it has a leak but I'd say that chance is absolutely miniscule... I saw every stage of the floor going in and internally all is fine.

Externally there is nil chance of a waterpipe in the ground, as I've seen what's there. There is a drainage below the ground for the gulley but it should be fine and even if it was leaking a bit, it shouldn't really extend across the whole wall. Internally there is a newly fitted water pipe...

Thank you for your informative post. After the Bell Cast is applied when you mention make good if all stains are clear, do you mean re-render where the plaster was removed? Also how likely will it be that there'll be a visible line where the new render joins the old? If it was painted perhaps...

Thanks for your assistance with this John. There was damp in some of the walls internally that is now resolved, however the injection was done more as insurance in case the property was sold, so that there would be a certificate, to allow it to be mortgageable. Underneath the chippings, there...

Thanks for the suggestions so far guys. The gulley drain is clear and the water gets away no problem, it was only fitted when the extension was put on about 2 years ago and should be fine. An aco drain could be a good idea to help stop splashback but I'm not sure if that will fully solve the...

Hi Guys, The property in the photo illustrates a plaster-rendered wall with damp appearing to be rising up it. It was plastered about a year or two ago. Initially, I thought it was possibly just the plaster drying out but quite recently it has now started to show some salts in one place, which...