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Parapet wall render issues

Discussion in 'Roofing and Guttering' started by jmgh, 3 Feb 2019.

  1. jmgh

    jmgh

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    Hi,

    Recently discovered mould on the south facing wall of my house close to the party wall. It was hidden behind a cupboard so we didn't notice it developing.

    I'm not sure if this is from condensation or a leak. Can't see any obvious places for water to get in on the back wall.

    There is however an obvious problem with the parapet wall render. It is all falling off, and it has been done twice now in six years. I'm assuming the two are connected.

    Can anyone advise how this render should be applied so that it doesn't fall of in slabs?

    Would you agree that this is the likely cause of the mould?

    Any advice would be greatly appreciated.

    Many thanks,

    John
     

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  3. Notch7

    Notch7

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    It might be just the photo angle, but where the parapet and roof tiling meet the chimney look like water traps.
     
  4. jmgh

    jmgh

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    Thanks Notch.

    Just had a closer look. Do these pics clarify? The chimney looks pretty leaky...
     

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  5. Alastairreid

    Alastairreid

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    Looks like condensation, does it wipe off?
    The render is falling off in sheets because it has not been prepped properly.
    The chimney head needs attention but doubt that is causing the problems you are having.
     
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  6. jmgh

    jmgh

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    Thanks ker plunk.
    Yep, I've washed it all off. So you don't think it's mould? That's good news. Guess it makes sense as it's nearly all on the cold back wall.

    J
     
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  8. Alastairreid

    Alastairreid

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    Its been condensation spotting on a cold wall, if you had furniture sitting there then air wouldnt get circulating.

    Bit of bleach on a sponge should get rid of it.

    The maintenance on your roof can wait till the better weather.
     
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  9. jmgh

    jmgh

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    Thanks for the advice. Much appreciated.

    John
     
  10. noseall

    noseall

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    Agree with plunk, black spot mould is a manifestation of internal moisture, cold surfaces and poor air circulation.
     
  11. datarebal

    datarebal

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    good job it didn't end up like this...
     

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  12. DIYnot Local

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