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Has anybody seen anything like this before

Discussion in 'Decorating and Painting' started by floorboard10, 10 Aug 2011.

  1. floorboard10

    floorboard10

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    Had my walls recently skimmed, put a mist coat on then 2 coats of dulux vinyl matt emulsion on, about a month later, damp marks started coming through. the picture with the hole is where the waste pipe is boxed in, i cut a hole to check for leaks and everything is dry?? so a bit confused. the other picture is of a internal wall, There must be moisture present on both sections. as when i put an electric heater on the marks it disappears but reappears within a few hours. im not exactly sure if it is damp as there are dry spots in the middle of the patches. the skim was left to dry for about a month so dont think its that, anyone have any ideas????
     
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  3. TheDec

    TheDec

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    A month is more than enough for a skim coat to dry out, have you checked the exterior of the property for damp areas, guttering perhaps, it really does sound rather strange. Try posting this on the Builders forum they may be able to shine some light on it.

    Dec
     
  4. misterhelpful

    misterhelpful

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    It could possibly be caused by the use of some gone off plaster but it is odd that it dries out and reappears.
     
  5. floorboard10

    floorboard10

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    ive also tried putting zinnser bin on it then re emulsioned over it and again same marks appear, so that rules out stains of any kind
     
  6. TheDec

    TheDec

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    Well I am no plasterer but I doubt this has anything to do with the skim, I would tend to think that there must be an ingress of moisture coming from somewhere.

    Dec
     
  7. Robbie uk

    Robbie uk

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    Is that a chimney breast with no vent ? could be trapped moisture in the wall.
     
  8. floorboard10

    floorboard10

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    hi, no its a boxed in waste pipe, boxed in with wood then plasterboard then plaster, i thought it might need vented so cut the hole to check for water ingress and everything dry. but marks are still visable with the vent. the other wall has exactly the same type of patches on it and that is a solid internal wall (joined to the gable end) so think that rules out the venting option too??
     
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