1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

New flat roof - Problems

Discussion in 'Roofing and Guttering' started by bobcatt777, 13 Mar 2016.

  1. bobcatt777

    bobcatt777

    Joined:
    13 Mar 2016
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    image.jpeg

    Hi every body

    Four weeks ago I had a new flat roof installed on my garage due to a fire including new boards, joists, felt etc etc.

    After 3 weeks all the boards in the roof are covered in black mould. I spoke with the roofer who said this is normal as it was raining when he did the work. He suggested I treat the mould and it will be ok.

    I'm concerned that the roof has not been installed correctly. Should I be worried? Any ideas?

    Thanks -picture of boards below
     
  2. Sponsored Links
  3. freddiemercurystwin

    freddiemercurystwin

    Joined:
    21 Jan 2007
    Messages:
    18,982
    Thanks Received:
    2,111
    Location:
    Devon
    Country:
    United Kingdom
    It's probably caused by condensation due to a lack of ventilation.
     
  4. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    30,770
    Thanks Received:
    4,068
    Location:
    West Mids
    Country:
    United Kingdom
    Due to lack of insulation more like.

    Certainly not a defect though.
     
  5. tony1851

    tony1851

    Joined:
    23 Feb 2012
    Messages:
    9,862
    Thanks Received:
    1,473
    Location:
    Manchester
    Country:
    United Kingdom
    Would you normally insulate a garage flat roof?
    The mould does seem excessive - is the garage open to a utility room/kitchen, or is vapour getting in some other way, perhaps?
     
  6. bobcatt777

    bobcatt777

    Joined:
    13 Mar 2016
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi thanks for all your replies. The garage does have a double air brick.

    The garage is in a block. Not attached to a dwelling etc.

    I've always had a garage in a block and never had a problem
    Like this before. I'm still thinking it has not been installed correctly? as there is no mould on the joists. Surly if condensation was a problem it would be on them also?

    I also have a few odd bits of wood in the garage with no mould on

    Again any ideas would be appreciated thanks
     
  7. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    30,770
    Thanks Received:
    4,068
    Location:
    West Mids
    Country:
    United Kingdom
    Black mould spotting can't form on penetrating water. It can only result from condensation. That's why it can't be a defect and that's why insulating the deck would have prevented it.
     
  8. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,359
    Thanks Received:
    622
    Location:
    Lancashire
    Country:
    United Kingdom
    What exactly is that we are looking at plasterboard?
     
  9. bobcatt777

    bobcatt777

    Joined:
    13 Mar 2016
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi no it's plywood
     
  10. Sponsored Links
  11. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,359
    Thanks Received:
    622
    Location:
    Lancashire
    Country:
    United Kingdom
    I have never had that issue, what was the roof before and what is it now ie. felt grp rubber?
     
  12. bobcatt777

    bobcatt777

    Joined:
    13 Mar 2016
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi. It was felt before and felt now.

    I've never had this problem either.

    I'm sure the roof hasn't been installed correctly.
     
  13. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    30,770
    Thanks Received:
    4,068
    Location:
    West Mids
    Country:
    United Kingdom
    Why? Is it leaking
     
  14. bobcatt777

    bobcatt777

    Joined:
    13 Mar 2016
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    No. I own a few garages and have never seen this in a "new roof" before.
     
  15. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    30,770
    Thanks Received:
    4,068
    Location:
    West Mids
    Country:
    United Kingdom
    Perhaps it's different ply with different glue
     
  16. freddiemercurystwin

    freddiemercurystwin

    Joined:
    21 Jan 2007
    Messages:
    18,982
    Thanks Received:
    2,111
    Location:
    Devon
    Country:
    United Kingdom
    Maybe the plywood is crying? Maybe it wanted to spend its life used as an exposed soffit getting an occasional cheeky glimpse down ladies cleavage's but instead it faces a life in the dark in a cold and wet garage?
     
    • Thanks Thanks x 1
  17. ^woody^

    ^woody^

    Joined:
    3 Sep 2006
    Messages:
    30,770
    Thanks Received:
    4,068
    Location:
    West Mids
    Country:
    United Kingdom
    I've just seen this on the BBC:

    "South West Water customers should drink bottled water until further notice."
     
    • Like Like x 1
Loading...

Share This Page