Several Damp patches

Discussion in 'Decorating and Painting' started by JonHeath, 23 Apr 2013.

  1. JonHeath

    JonHeath

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    Hi all,

    I've recently gutted, replastered and redocorated my lounge.

    This included pulling off hollow patches of plaster above the fireplace and replastering, as well as having the whole room skimmed.

    There was several small patches which weren't completely dry when I started the mist coat (needs must).

    Anyway the painting has been finished and I still have a few small patches (see the pictures).

    It's now around 6 weeks since the plastering, and 4 weeks since the painting.

    There are a couple of very small patches which I can only describe as "grease" like. See the first picture below. These are on the chimney breast itself. I have a few similar patches on the breast in the bedroom above too on the same chimney breast.


    I then have a slightly different patch near a window which seems to have partially dried out, leaving dried out marks, but still seems to have a few darker marks as well. See the second picture.


    My question is - what is the recommended approach to tackle these 2 problems? I'm tempted just to wait on the patch that is drying out leaving water marks, and then just paint over it again?

    I think the other more "grease" like marks need a slightly different approach?

    Cheers
    Jon
     
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  3. Pigeon85

    Pigeon85

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    As long as your sure its all dry now and sound then give the marks an oil based undercoat first then paint.
     
  4. JonHeath

    JonHeath

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    Thanks for the reply.

    I'm not sure they are all dry or will ever be fully dry. The "greasey" darker likeness of some of the patches is very much like the bedroom above on the same chimney breast. I guess it must be very small spots of damp from the breast (even though the breast is capped off).

    I think I'll just go over them as you suggest anyway first to see what the result is like, before doing anything more radical. Is painting over with an oil based paint first and then another coat or two of the emulsion likely to leave bumps in the effected areas as those areas will have 2 or 3 coats more than the rest of the wall?

    Cheers
     
  5. Pigeon85

    Pigeon85

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    If that does worry you then apply it with a sponge roller and roll it out nice and even (not the whole wall but on and around effected area), just make sure it's not put on to thick.
     
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  7. wallcoatingsbloke

    wallcoatingsbloke

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    hiya. I think if its on the chimney breast then it is either damp or rain coming from the top of the chimney and running down inside, a poor condition exterior wall, or perhaps as it was used a chimney, some sort of chemical was used on the breast that may need sealing.
     
  8. dcdec

    dcdec

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    You need to track down and fix the source of the damp, check flashing and pointing around the chimney and exterior seal around the window.
     
  9. JonHeath

    JonHeath

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    Hi,

    I did check the flashing on top of the chimney last year (to resolve the bedroom patches) and did end up re-cementing the flashing into the brick work. But it still looks like there's damp somewhere in the chimney brick work.

    I'll have a look at the window. It has been replaced in the last 2 years as well, so the seal should be good.

    Obviously there's something seeping into the brick work somewhere! :)

    Cheers
     
  10. Pigeon85

    Pigeon85

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    Say for instance the flashing was the cause of the problem, maybe leave it through the summer to give it a good drying out, maybe some moisture still trapped and had to come out some how.
     
  11. DIYnot Local

    DIYnot Local

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