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?
  7. Memphis001

    Memphis001 New Member


    When you say wall construction (Sorry!) are you meaning internally or externally?

    The room is south facing and does get v hot when sunny. I will try to check humidity levels.

    I am still unsure whether it is a roofing issue (flashing around chimney as per picture), guttering (as per picture) or humidity as you say!

    I think I can hear a slow drip when we have rain but perhaps I am just imagining the worse!
  8. ElecCEng

    ElecCEng Screwfix Select

    I’m thinking along the lines of say a cavity brick wall with a chimney in the middle. If there’s a big open space behind the chimney that could make that part of the interior wall colder.

  9. GRH

    GRH Active Member

    The gutters are not leaking are they?
  10. Memphis001

    Memphis001 New Member

    Could this also cause moisture to the touch on the ceiling?

    I have noticed today that even with no rain today / yesterday, it feels wetter on ceiling and upper parts of wall.


    (You can see discoloration - just about - at top of wall join with ceiling...)

    Attached Files:

    Last edited: Sep 25, 2021
  11. Memphis001

    Memphis001 New Member

    Not in a way that is noticeable (i.e. water spilling down to floor) but the gutter looks like it sits on the brick ledge which looks a little weird to me... (as per picture above) and something that could easily cause an issue?
  12. Memphis001

    Memphis001 New Member

    Thanks for the help on this. Proposed fix is to bring the flashing around the corner of the chimney and ensure it is going behind the gutter.

    Fingers crossed!

  13. Memphis001

    Memphis001 New Member

    Update on this... We have had the flashing replaced around the chimney and had all the pointing around it and on chimney stack redone. This has stopped the drip noise that I mentioned above.

    However we are still getting the weird greasy patches on the ceiling near the chimney and condensation running down the wall.

    If I knock at different points along the wall I can definitely feel that it goes from brick to big empty space but I am not sure how that would impact the ceiling patches we are getting?

    Could the previous owner have painted this corner of the kitchen with a special paint that goes greasy when there is moisture on the other side?

    I am also running a dehumidifier in the room to keep humidity between 50-60%. If I leave it off then it climbs to approx 70% as is kitchen (cooking, washing etc.)

    Puzzled to say the least....
  14. Wayners

    Wayners Screwfix Select

    Knock hole through stained area to look and see what's happening
  15. Memphis001

    Memphis001 New Member

    in wall? or ceiling too?
  16. Wayners

    Wayners Screwfix Select

    Need to have a look behind and see what's happening

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice