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Damp / mould problem *with muchos PICS!*

Discussion in 'Building' started by boolie, 6 Feb 2021.

  1. boolie

    boolie

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    I want advice on how to tackle this damp/mould problem. We've had this problem for over a year now.. Ive painted over it in the past but the 'black' keeps coming back. By the way we cant really smell anything. The damp/mould is behind some kitchen units but seems to be going higher. The house is quite old (about 100 years) and there is a cellar. Pictures below with some further explanation.. anyone know how I can fix it?

    Pics below with more info, summarised here

    PIC 1 -
    So I've removed the doors from the units here.. you can see the mould / damp
    PIC 2 - This is what it looks like with the units removed
    PIC 3 - Grill removed from vent
    PIC 4 - moisture reading from the blackest part doesnt show any significant reading
    PIC 5 - Picture of cavity (taken from inside air vent)
    PIC 6- Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me
    PIC 7 - Outside section
    PIC 8 - Outside section top
    PIC 9 - Outside section - roof


    PIC 1
    So I've removed the doors from the units here.. you can see the mould / damp
    PXL_20210206_152004158.jpg


    PIC 2

    This is what it looks like with the units removed
    PXL_20210206_151244401.jpg


    PIC 3

    Grill removed from vent
    PXL_20210206_144042124.jpg


    PIC 4

    moisture reading from the blackest part doesnt show any significant reading
    PXL_20210206_150340550.jpg


    PIC 5

    Picture of cavity (taken from inside air vent)
    PXL_20210206_150856140.jpg


    PIC 6

    Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me
    PXL_20210206_145114427.jpg


    PIC 7

    Outside section
    PXL_20210206_144859838.jpg

    PIC 8
    Outside section - top
    PXL_20210206_144855533.jpg

    PIC 9
    Outside section - roof
    PXL_20210206_155234354.jpg
     
    Last edited: 6 Feb 2021
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  3. catlad

    catlad

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    Was it the old toilet originally when the house was built? Looks like the yard wall is creating a cold spot exacerbating the mould in that corner, coupled with the dead air behind the cupboards.
     
  4. boolie

    boolie

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    no it wasn't the old toilet.. there did used to be an old toilet in another part of the garden (completely separate from the house)
     
  5. catlad

    catlad

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    Seems a strange room to have in a house! Has it got a stone roof?
     
  6. boolie

    boolie

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    it used to be a kitchen in the old days.. still is kind of - but the kitchen now extends out in the main room. Also have a tumble dryer in the room which gets a lot of use - which may be causing the problem.
     
  7. Djangobanjo

    Djangobanjo

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    Looks like cold condensation mould to me, so foiled backed insulation boards glued in place and boarded over.
    And maybe make sure the tumble dryer is vented out properly.
     
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  8. catlad

    catlad

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    Tumble not maybe!
     
  9. Djangobanjo

    Djangobanjo

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    I bought a condenser dryer a few years ago, so good - rather than pumping out moist air, it blows out warm dry air. Probably costs more to run, but no risk of condensation problems, and helps warm up cold utility rooms.
     
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  11. boolie

    boolie

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  12. kingandy2nd

    kingandy2nd

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    I'd also be looking at that rear wall and how any moisture could be getting in from there.
     
  13. JohnD

    JohnD

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    is the airbrick blocked?

    condensation behind furniture is common when the external wall behind the furniture is not warmed, and damp air can get to it.

    this can be prevented either by ventilating to the outside; or by warming the wall.
     
  14. boolie

    boolie

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    no the air brick isn't blocked - heres a picture of it (I did vacuum the spider webs afterwards!
    PXL_20210206_145220103.jpg
     
  15. JohnD

    JohnD

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    it looks blocked

    ..apart from those slits.
     
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  16. boolie

    boolie

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    I see your point - Ive never cleaned it in say 20 years or so! What's the best way to clear it? Should I just give it a good scrape with a chisel ?
     
  17. JohnD

    JohnD

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    airbricks are usually choked with cobwebs and dust. I'd probably hose it from the inside.

    If you ever tidy the wall, lay a mortar bed sloping so any water will run outwards. Sometimes, slate offcuts from the DPC are used to prevent it soaking into the bricks.
     
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