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The state of this flat roof

  • 12-06-2023 11:16pm
    #1
    johnuknow
    Registered Users, Registered Users 2 Posts: 2 ✭


    Just bought a house with one room under a flat roof (torch felt) which is not leaking but is a bit old.


    When I got up on the roof, I was struck by these raised ridges. It looks like they were planned as they are not random bubbling.


    Anyone seen this before. I could go and fix them but I'm afraid I'd end up with a leak :)

    20230607_183207.jpg




Comments

  • #2
    dathi
    Registered Users, Registered Users 2 Posts: 1,422 ✭✭✭dathi


    don't know if it the same as yours but i have seen flat roofs where chipboard was used as the decking and it has sagged over time resulting in all the joists being visible



  • #3
    The Continental Op
    Registered Users, Registered Users 2 Posts: 7,676 ✭✭✭The Continental Op


    Well there is definitely something wrong? You don't put higher strips like that long the direction the water will drain off. You can see where crap has collected and the drain off has pushed down the bulge. It looks like there was something under those bulges and its collapsed but no idea what as I've never seen a torch on roof like that. I wonder if its got really hot and expanded, pushing up along a line of least resistance? Might even be a bodge job with a new layer of felt torched onto an old base? It looks like there is repair/protection coat painted on the top of the felt?

    Obvious question what did your surveyor say about it?

    Assume the picture doesn't indicate the actual fall on the roof?

    Wake me up when it's all over.



  • #4
    Mr321
    Registered Users, Registered Users 2 Posts: 692 ✭✭✭Mr321


    Looks to me where the ridges are is where it has lifted overtime from poor adhesive combined with heat.

    I'm assuming it's not leaking but it's something that would be worth getting redone at some point. I wouldn't walk/leave on those ridges as you could crack them BTW



  • #5
    whizbang
    Registered Users, Registered Users 2 Posts: 1,998 ✭✭✭whizbang


    My gut says those are 8 x 4 sheets under. The sheets expand and contract pushing and pulling at the joints, causing those ridges.

    You will be lucky to get the winter out of it.

    Plan for a new roof now. With insurance companies having a bee in their bonnet about flat roofs lately, it might well be money saving investment.



  • #6
    10-10-20
    Registered Users, Registered Users 2 Posts: 8,288 ✭✭✭10-10-20


    https://www.boards.ie/discussion/comment/120728632#Comment_120728632

    Probably a fair assessment.



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  • #7
    the_pen_turner
    Registered Users, Registered Users 2 Posts: 7,623 ✭✭✭the_pen_turner


    https://www.boards.ie/discussion/comment/120728632#Comment_120728632

    my gut is telling me something similar.

    i think the heat has expanded everything and stretched it. it cannot give much on the sheets underneeth but can where they join. hot and cold cycles have pushed and pulled it .

    definetly needs a job doing fairly soon. personnaly i would go back up the other roof a bit and put a good fall on an insulated cladding or similar roof



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