1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Damp patch and Efflorescence

Discussion in 'Building' started by liquidxtal, 29 Jun 2021.

  1. liquidxtal

    liquidxtal

    Joined:
    21 Jun 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi,

    I'm having problems with a damp patch on an interior wall. The bricks on the exterior of the wall have a white crystalline deposit on them. I have been recommended to treat the external wall with Thompson's water sealant. Should I try and remove the white deposit before I coat with the water sealant or will the application of the sealant be all that is required?

    Thank you
     
  2. Sponsored Links
  3. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    74,266
    Thanks Received:
    4,290
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    Find the leak or drip causing the damp and repair it.

    Once the wall has fully dried, you can take a look at the efflorescence.

    Some photos will help a lot.
     
  4. KenGMac

    KenGMac

    Joined:
    24 Aug 2010
    Messages:
    3,853
    Thanks Received:
    746
    Location:
    Ayrshire
    Country:
    United Kingdom
    As johnD above, one prime suspect will be a leaky rain water gutter, next time it rains pop out and have a look

    Ken
     
  5. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    34,013
    Thanks Received:
    4,617
    Location:
    West Mids
    Country:
    United Kingdom
    Thompson's is a water repellent, it does nothing for salt deposits
     
  6. mrrusty

    mrrusty

    Joined:
    1 May 2018
    Messages:
    739
    Thanks Received:
    147
    Country:
    United Kingdom
    Surface seals, seal water in so walls can't dry to atmosphere. Unless it is raining, relative humidity is usually <100% hence moving air over a wall will dry it.
     
  7. liquidxtal

    liquidxtal

    Joined:
    21 Jun 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi

    Thanks for the above replies and please forgive me for my late reply – computer troubles!

    All of the replies offered sound advice especially the posts by JohnD and KenGMac. Woody and mrrusty – good logic. Thanks all, will report back as to how successful I have been.

    Barry
     
  8. Sponsored Links
Loading...

Share This Page