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

Fixing a cowboy job roof gone wrong... and saving money!

Discussion in 'Roofing and Guttering' started by Stonehouse2022, 25 May 2021.

  1. cdbe

    cdbe

    Joined:
    22 Nov 2009
    Messages:
    1,376
    Thanks Received:
    243
    Location:
    Oldham
    Country:
    United Kingdom
    Those joists seem to be considerably undersized and at extremely large centres, I'd remedy that before going straight to the epdm. If the OSB is in poor condition but structurally sound overlay it with some 9mm. Your decorator friends will have the epdm down in half an hour, it's like wallpapering on the flat. Any temporary fix (other that a bucket underneath) is throwing good money after bad.
     
    • Thanks Thanks x 1
  2. Sponsored Links
  3. Stonehouse2022

    Stonehouse2022

    Joined:
    25 May 2021
    Messages:
    9
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi, thanks your input.

    Why do you think the joists are undersized? They could be, but I was told they are the right size but perhaps not enough of them, then again another builder said there is adequate spacing between joists.

    A builder did walk around on the top of the roof fine.

    I'm deciding now whether to strip the felt, replace damaged OSB then put down EPDM... or just temp cover the whole roof with layers of DPM/TARP and batten down which two individuals say would last 2 years if done properly.
     
  4. Notch7

    Notch7

    Joined:
    15 Sep 2017
    Messages:
    25,164
    Thanks Received:
    1,783
    Location:
    S. Uplands
    Country:
    United Kingdom
    Lay the DPM 90 deg to the fall
     
    • Thanks Thanks x 1
  5. cdbe

    cdbe

    Joined:
    22 Nov 2009
    Messages:
    1,376
    Thanks Received:
    243
    Location:
    Oldham
    Country:
    United Kingdom
    You probably need something in the region of 8x2 at 600 centres for a 4m clear span.

    My neighbour temporarily repaired his roof in a similar manner about 5-6 years ago, he's certainly had his money's worth out of some bricks and a sheet of polythene, makes you wonder why people bother with proper roof coverings.

    IMG_20210526_172304781.jpg
     
    • Thanks Thanks x 1
    • Like Like x 1
  6. Stonehouse2022

    Stonehouse2022

    Joined:
    25 May 2021
    Messages:
    9
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi guys,

    thank you all for your responses.

    i got the temporary cover on today and battened down nice and tight.

    should last a while for now, DPM was great suggestion 300mu is solid stuff.

    And then a whole new roof is needed with insulation.

    The current fall angle is not enough needs to be 10 to 1.

    The osb needs replacing with plywood.

    so ill save up D0C87C52-048B-4177-93E4-F79C6DE7C54C.jpeg
     
    Last edited: 28 May 2021
  7. Notch7

    Notch7

    Joined:
    15 Sep 2017
    Messages:
    25,164
    Thanks Received:
    1,783
    Location:
    S. Uplands
    Country:
    United Kingdom
    That's a nice neat job, well secured around the edges.

    The angle of a flat roof is 1:40 for felt and slightly less for EPDM - providing the joists are strong enough and don't bow
     
  8. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    3,379
    Thanks Received:
    695
    Location:
    Hampshire
    Country:
    United Kingdom
    The Dpm will crack up in the UV.
    I've some pictures some where of a flat roof covered Dpm after a lead theft . Less than 3 months it was falling apart
     
    • Like Like x 1
  9. Sponsored Links
Loading...

Share This Page