Moisture / Grease appearing on ceiling

Discussion in 'Builders' Talk' started by Memphis001, Sep 14, 2021.

  1. Memphis001

    Memphis001 New Member


    Have a issue where every time it rains we get:

    - moisture (not rain water!) running down across a stretch of wall in the kitchen
    - greasy, wet to touch ceiling patch (but water is NOT running through)

    This happens along the wall that contains a chimney breast that is no longer in use.

    We have had the roof recently cleaned and acropol / cement used to tidy up bits and pieces (it is an old roof) but it appears that these haven't fixed the issue as after the rain today the patch is wet to touch again.

    Any pointers would be greatly appreciated!

  2. Wayners

    Wayners Screwfix Select

    Punch hole (neatly) and look through with torch.
    See where water is coming from. If you have a leak that area will be rotting anyway
  3. Memphis001

    Memphis001 New Member

    Thanks... do you think there is any use checking the loft directly above to see if there is any sign of water / water damage up there?
  4. Wayners

    Wayners Screwfix Select

    Yes. Get up there.

    If not sure where water is dripping lay newspaper and the print will run with any water drops.

    Sometimes it drys a bit quick or only small amount of water so newspaper will show that
  5. Memphis001

    Memphis001 New Member

    thanks! i have done so. the damp patch / discolouring is in line with the protruding brickwork here... is anything visible that isn't quite right to someone who knows more about this than me!

    Attached Files:

  6. ElecCEng

    ElecCEng Screwfix Select

    What is the wall construction and internal finish?

    You could possibly be looking at different temperatures on your wall causing condensation in different places. This will be more noticeable during rain (higher humidity levels).

    For example if your walls are insulated and there is a section that just has a big hollow space behind (chimney), the chimney part will be colder and moisture will condense on it before other parts of the wall.

    The greasy area will also be a slightly different temperature as well as having a greater surface area, so moisture will condense there sooner too.

    Might be worth buying a cheap humidity meter and checking the moisture levels. Is the room heated and well ventilated?

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