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

Leaking Roof

Discussion in 'Roofing and Guttering' started by Jakg, 20 Nov 2020 at 10:22 PM.

  1. Jakg

    Jakg

    Joined:
    26 Dec 2017
    Messages:
    49
    Thanks Received:
    4
    Country:
    United Kingdom
    My house came with a recently built (~7 years) extension.

    I've had a couple of leaks from the roof - earlier in the year I pulled a couple of tiles off, found a hole in the felt, patched it and all good.

    Unfortunately, it's come back (from somewhere else). Not "leave a bucket on the floor", but enough to slowly damage the plaster.

    I subsequently realise that it's not the felts job to keep the water out, and I probably have a bigger problem.

    The red patch is where water is appearing in the ceiling.

    [​IMG]

    From the room below.

    [​IMG]

    From in the loft - although I can see where the waters going, I can't see where it's coming from

    [​IMG]

    Tiles detail (Marley Duo)

    [​IMG]

    Roof construction (black stuff is the sealant I used to patch the hole)

    [​IMG]

    I called a roofer who came round and set the installation was all wrong and I needed a new roof.
    After a little more discussion he said he'd come back the next week and take some tiles off and have a proper look to see if there were any other options.
    That was four weeks ago and radio silence...

    I spoke to another one who again said the installation was wrong (specifically - incorrect tiles for pitch) and suggested a re-roof.
    They suggested coming out to have a look, but again they seem to have gone quiet.

    So it looks like a nice simple life of paying someone is out the window...
    I dread to think how much a re-roof would cost, so I'm reluctant to shell out £,£££ on the basis of a quick conversation - I'm hoping that's not the only option.

    One suggestion was that the outlet on the gutter of the roof above is just draining onto the roof below, and maybe water is getting under the tiles there - it's in line with the damage on the ceiling.

    Alternatively, I could take a strip of tiles going up the roof off and see if I can see anything else.

    Any other ideas?
     
  2. Sponsored Links
  3. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,133
    Thanks Received:
    171
    Country:
    United Kingdom
    An independent building survey might identify the problem.

    The tiles do not appear to be staggered.

    Is there a pic of where the new roof meets the wall of the existing house?

    Blup
     
  4. Jakg

    Jakg

    Joined:
    26 Dec 2017
    Messages:
    49
    Thanks Received:
    4
    Country:
    United Kingdom
    upload_2020-11-20_23-11-14.jpeg
     
  5. Makie

    Makie

    Joined:
    8 Mar 2018
    Messages:
    103
    Thanks Received:
    17
    Country:
    United Kingdom
    You can see they are staggered on the 5th picture?
     
  6. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,133
    Thanks Received:
    171
    Country:
    United Kingdom
    Apparently there is no need to stagger these tiles because the overlaps automatically seal the side joints.

    Acceptable tile pitch is influenced by the headlap so that might be the installation factor the roofer was referring to, and in principle was therefore sound advice.

    However having seen the damage that an overflowing gutter can do, I would sort that out first, and it may well solve the damp problem.

    Blup
     
  7. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,133
    Thanks Received:
    171
    Country:
    United Kingdom
    Can you post a pic of the gutter outlet, including the top two bonnet tiles which seem to be a different colour and therefore possible replacements.

    Blup
     
  8. Barthy

    Barthy

    Joined:
    19 Sep 2020
    Messages:
    56
    Thanks Received:
    17
    Location:
    Hampshire
    Country:
    United Kingdom
    Waterchecks/channels/interlocks are often the weakest part of a tile.
    Duos or whatever they are should be brick bonded to allow the Watercheck to sit on solid tile.
    Headlap suspect but sealing gaps in tiles I wouldn't advise as any water that reaches above will have no exit
     
    • Thanks Thanks x 1
  9. Barthy

    Barthy

    Joined:
    19 Sep 2020
    Messages:
    56
    Thanks Received:
    17
    Location:
    Hampshire
    Country:
    United Kingdom
    Flashing is an epic fail I'm afraid
     
  10. Sponsored Links
  11. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    2,857
    Thanks Received:
    493
    Location:
    Hampshire
    Country:
    United Kingdom
    As above , they should be broken bonded , which they are not.
    Headlap is way less than it should be.
    Flashing , a waste of time. Rip it off and used lead or a suitable alternative.
    A very close up of the detailing around the top of the hip would be interesting too
     
  12. tel765

    tel765

    Joined:
    16 Oct 2020
    Messages:
    123
    Thanks Received:
    21
    Country:
    United Kingdom
    As above,
    plus, in pic 3 the lower membrane seems to have been taken over the higher membrane - instead of the higher membrane overlapping the lower membrane.

    The lower courses seem to be installed with a wrong, straight bond, and the upper courses with a correct, broken bond.

    Off page but is that the ragged edge of the main roof membrane peeping out under the main roof gutter?
     
  13. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    2,857
    Thanks Received:
    493
    Location:
    Hampshire
    Country:
    United Kingdom
    Headlap influenced by roof pitch .
     
  14. Jakg

    Jakg

    Joined:
    26 Dec 2017
    Messages:
    49
    Thanks Received:
    4
    Country:
    United Kingdom
    Yes. I don't think it was installed square so some of it sits in the gutter - in fact around the corner water actually flowed over the side of the gutter because of it.
    I'm not 100% sure I understand, but if you think it's more than one sheet, it looks to be one sheet just with some ruffles in it, I couldn't see a join from inside the roof.
    This is a more up-to-date picture - I added a straight drop on with a straight edge - I'm wondering if thats actually made it worse as the water is now more concentrated on one area.

    [​IMG]
     
  15. datarebal

    datarebal

    Joined:
    1 May 2007
    Messages:
    2,857
    Thanks Received:
    493
    Location:
    Hampshire
    Country:
    United Kingdom
  16. blup

    blup

    Joined:
    5 Nov 2007
    Messages:
    1,133
    Thanks Received:
    171
    Country:
    United Kingdom
    The top hip tiles look like they might have been the source of water ingress.

    Blup
     
  17. catlad

    catlad

    Joined:
    29 Jul 2011
    Messages:
    4,198
    Thanks Received:
    580
    Location:
    Lancashire
    Country:
    United Kingdom
    What did the survey say about the roof when you purchased the house?
     
Loading...

Share This Page