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Wet patches on wall

Discussion in 'Plastering and Rendering' started by dan2002, 28 Jul 2021.

  1. dan2002

    dan2002

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    Hi, how come I have wet patches on my wall? I have had it for a long time. The wall was redone: new plasterboards & new plastering. Its been like a year now. Anyone know why I have these massive patches/dots? I had it across all the wall. If I put wallpaper over it will the patches be visible on the wallpaper? I have attached a picture of the wall.
    761899CB-6A14-4F3B-891F-06637C35F9D6.jpeg
     
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  3. KenGMac

    KenGMac

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    dan2002, good evening.

    Most common cause of the staining you have is that, the staining is caused by the "Dots" of the dot and dab method used to fix the plasterboard.

    The above also needs the external wall to be "damp / wet" to allow the Dots to absorb the moisture in the external wall and transfer the dampness into the plasterboard.

    No wall paper will mask these damp marks.

    One "fix" is to remove the plasterboard, attach new plasterboard to either timber or metal vertical battens?

    What is the wall behind the plasterboard made of? is it by any chance a solid brick wall?

    Ken.
     
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  4. dan2002

    dan2002

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    Yes. It is a solid brick wall. There is no passage way on the opposite side, it is the neighbours wall opposite. To fix this will I need to redo the wall by breaking it and then putting on new boards & new plastering?
     
  5. JohnD

    JohnD

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    Is it their bathroom?
     
  6. KenGMac

    KenGMac

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    Following JohnD above.

    I had [wrongly] assumed it was an external wall, as it is internal, how wide is the affected area? full width or just a section of the wall, and how high up is the uppermost stain mark?

    Any chance of an image of the wall from further back so we can get an overall picture?

    Ken,
     
  7. dan2002

    dan2002

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    No. I think it is their living room or Kitchen. One of the 2
     
  8. dan2002

    dan2002

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    It is across the whole wall. I have attached a picture.
    AB55BACF-E8AC-4B1D-8055-992805C415FA.jpeg
     
  9. KenGMac

    KenGMac

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    dan2002, good evening, again.

    OK because it is an Internal [party] wall ?

    The staining has gone to high to suggest "Rising Damp" this common complaint generally rises up no more than 900.mm to 1.0.m. on a wall.

    Questions?

    Is there a [say] a bathroom on either side of this party wall directly above, this stained wall, or a Kitchen on the other side, or?? even a radiator, on either side of this wall directly above the stained area?

    If there is a Rad leak, even in the neighbours property, that could be enough to cause the staining, if the neighbour does not know there is a leak.

    Do you have a "Combi" boiler? do you need to top it up frequently.?

    Suggest, if you can a discussion with the neighbour???

    Ken.
     
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  11. dan2002

    dan2002

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    I think opposite the wall it is the neighbours kitchen. Do you think there is a leak in the neighbours house? Also I have more information. That section of the wall use to be part of my kitchen back in the days, then it got converted to a dining room, now the living room & dining room got converted into one. Can that be an issue as-well? Hope this makes sense
     
  12. dan2002

    dan2002

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    I got it wrong. Opposite that wall is the next door neighbours garden. Its not the kitchen
     
  13. JP_

    JP_

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    Sounds like a cold wall then. I think only solution would be to insulate either the external side, or internal.
    Did the room feel cold in winter? Quick and easy solution would be sticking some insulated plasterboard, and if budget allows get it skimmed.
    Better would be insulation boards stuck and taped, with plasterboard stuck on top and skimmed.

    Cheapest solution would probably be thin 25mm insulation, plasterboard, then just patched over and painted. Not the best insulation or finish, but cheapest and quickest.
    Although you will need to remove and move skirting, electric sockets etc.
     
  14. dan2002

    dan2002

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    Yeah the room does be cold in the winter
     
  15. JohnD

    JohnD

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    can you take a pic of that wall, all the way up to the roof, and all the way down to the ground.

    include tiles, gutters, downpipes, windowframes, waste pipes, drains, manholes, and paving against the foot of the wall, please
     
  16. JohnD

    JohnD

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    I am finding i difficult to follow this thread.

    The wall used to be a kitchen? So there will be (have been) old water pipes, possibly running down the wall. There might have been a chimney

    the wall appears to be dot and dabbed to replaster.

    maybe there is a source of damp, such as a pipe or drain leaking, behind the plasterboard

    Or is there something above, such as a bathroom, that has pipes and wastes that might be leaking? Or a roof?
     
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