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Damp patch on new plaster

Discussion in 'Plastering and Rendering' started by Andrew Le Mas, 6 Sep 2021.

  1. Andrew Le Mas

    Andrew Le Mas

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    Hi all,

    From the pictures you may be able to see that I had heavily damaged plaster and a damp patch on the right hand side of my wall. After investigation, it was realised that poor guttering had led to water contact with the brick and it had eroded the external brickwork. This was then repointed and rectified.

    I then had the wall stripped back and then replastered. However after 3 months I still have a vertical persistent damp patch. It does coincide with the location of the wooden beam. I have tried drying it with a hairdryer and that works for a short time but then the damp patch comes back.

    What would you advise me to do in this situation? I have someone moving in soon and would really like to be able to paint the wall.

    Thanks,
    Andrew
     

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  2. motorbiking

    motorbiking

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    two options :
    1, paint it with damp proof anti mould paint, which will work for a while
    2, find where the damp is coming from.

    next time - use an insulated plasterboard with a foil backing. It may well be that moisture is still coming out of the wood beam from the soaking. This can take years
     
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  4. jeds

    jeds

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    As motorbiking says above, dampness can take many months to fully disperse from walls. I know it's not helpful now but you should really have used a renovating plaster.
    I'd get on and paint it with a trade paint. The purpose of trade paint is that it is more tolerant of dampness and will allow moisture to continue to evaporate. You may not even be able to see it afterwards.
     
  5. RonnieE

    RonnieE

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    Do you have a cavity wall or is it solid?
     
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