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

Roof window flashing problem

Discussion in 'Roofing and Guttering' started by Rampton, 25 Mar 2020.

  1. Rampton

    Rampton

    Joined:
    25 Mar 2020
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    I'm after some advice...
    The roofers have just finished and have installed 3 roof windows along with a completely new roof as part of what has turned into a nightmare of a loft conversion, but that's another story.
    I am under the impression that the tiles running down either side of the window should project below the main side flashings, ending at roughly the bottom of the skirt. Also rather than space the tiles from the eaves to have a course ending at the bottom of the window they've cut the tiles below the window opening which I think has cocked up their tile positions around it.
    The upshot is that a large area of flashing that I think should be under the next course of side tiles is exposed and has had to be stuck down rather than the weight of the tiles holding it there. When I challenged them over it they have assured me this is fine and they've always done it like this however I cannot find evidence of another installation like this anywhere.
    IMG-20200325-WA0013.jpg IMG-20200325-WA0011.jpg
     
  2. Sponsored Links
  3. Bonni

    Bonni

    Joined:
    11 Jun 2018
    Messages:
    438
    Thanks Received:
    90
    Country:
    United Kingdom
    Yes, it's wrong. A roof tile should cover that corner bit in your second photo that looks unstuck, or at worst, a max of 2" of the ribbed part not covered.
     
    • Thanks Thanks x 1
  4. martin hill

    martin hill

    Joined:
    7 Oct 2019
    Messages:
    460
    Thanks Received:
    78
    Location:
    salford
    Country:
    United Kingdom
    Yes again from me its wrong. Too dam lazy to cut the tiles and i'd say they used the wrong flashing kit as is not the one for plain tiles by the looks of it. They need to be stripped out totally and refitted by someone who knows what they are doing. Also not sure if it just the picture or angle but the tiles between the windows look like they are sagging or not fastened down correctly on the window edging.
     
    • Thanks Thanks x 1
  5. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,847
    Thanks Received:
    735
    Location:
    Lancashire
    Country:
    United Kingdom
    As the others have said its not correct, Its the correct flashing kit but the window needed to be lower down the roof maybe 100mm ish just gauging from the picture or each of the 10 rows of tiles needed 10mm adding to the gauge, either way it's their problem and it's wrong.
     
    • Like Like x 2
    • Thanks Thanks x 1
  6. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    3,335
    Thanks Received:
    682
    Location:
    Hampshire
    Country:
    United Kingdom
    Right kit, wrong fitting.
     
    • Thanks Thanks x 1
  7. Rampton

    Rampton

    Joined:
    25 Mar 2020
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for your comments guys, now to confront the roofer and judging by his response when I 1st questioned this and other issues it's not going to be easy. Hopefully building control will be able to back me up as well.
     
  8. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    3,335
    Thanks Received:
    682
    Location:
    Hampshire
    Country:
    United Kingdom
    interested to hear if they help...
     
    • Like Like x 1
  9. martin hill

    martin hill

    Joined:
    7 Oct 2019
    Messages:
    460
    Thanks Received:
    78
    Location:
    salford
    Country:
    United Kingdom
    Please please tell us you didn't pay all up front.
     
  10. Sponsored Links
  11. noseall

    noseall

    Joined:
    2 Feb 2006
    Messages:
    42,916
    Thanks Received:
    2,657
    Location:
    Staffordshire
    Country:
    United Kingdom
    Lol. The instructions are quite explicit in terms of window positioning in relation to tile battens/tiles. Velux and Keylite focus on different items (Velux the top of the tile, Keylite the top of the batten) but both have a set distance that the window is positioned relative to the tile coursing.

    It is then up to the builder to select the optimum tile course to position the window, even if that means designing and building the roof around the roof window. In the image below....
    ..we had little room for the top collars and be able to accommodate the largest height roof window possible, whilst positioning the window favourably. It was a juggling act that required measuring and forward planning including adjusting the tile gauge etc.

    EDIT: I cut the roof collar ends with a jaunty angle, to make fitting of the trimmers easier and the later fitting of the Celotex between rafters.
     
    Last edited: 27 Mar 2020
    • Like Like x 2
  12. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,847
    Thanks Received:
    735
    Location:
    Lancashire
    Country:
    United Kingdom
    And Please stop referring to him as a roofer because he obviously isn't.
     
  13. bobasd

    bobasd

    Joined:
    2 Dec 2017
    Messages:
    2,368
    Thanks Received:
    435
    Country:
    United Kingdom
    Typically, BCO has nothing to say to the quality of the work.
    BCO is to enforce the Regs.
     
  14. SpecialK

    SpecialK

    Joined:
    27 Sep 2010
    Messages:
    712
    Thanks Received:
    99
    Country:
    United Kingdom
    I'm no roofer ... but is the tile overlap OK?
     
  15. Wolfman99

    Wolfman99

    Joined:
    10 Feb 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Picked up this thread as I think I have a similar issue. See photo attached.
    The exposed flashing at the bottom of the Velux on the left chatters in the wind.
    What do you chaps think is the cause?
     

    Attached Files:

  16. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    3,335
    Thanks Received:
    682
    Location:
    Hampshire
    Country:
    United Kingdom
    This a slightly different situation and flashing . cement fibre slate gauge is set. if the velux was already there, then either you move it or live with what you have.
    simple solution is a CDR on the corners which will hold the flashing down.

    there are a few cdrs missing fwiw
     
    • Thanks Thanks x 1
  17. Wolfman99

    Wolfman99

    Joined:
    10 Feb 2021
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Thank you datarebal.
    The whole roof/dormers/velux are new. Velux have said the warranty is void because in their view the window has not been installed as per their instructions.
    What is CDR?
     
Loading...

Share This Page