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Repairs to flat roof

  • 07-09-2011 4:26pm
    #1
    Monkstownman
    Registered Users, Registered Users 2 Posts: 14 ✭


    Hi,
    Please can you look at the attached image.
    I'm unsure as to the covering used on our flat roof. Does anyone have any ideas from this image?
    There are some weaknesses at the sides which a workman says needs repairing by Silicone sealant. However, not knowing the construction of the roof, I don't know if this is the best approach. Perhaps, a metal paint type covering is more appropriate.
    This roof was done in 2007, how long do they usually last before anything needs to be done.
    Regards,
    Johnny


Comments

  • #2
    sterlo
    Registered Users, Registered Users 2 Posts: 6 ✭sterlo


    It looks like a torch-on felt with a solar reflective paint on it, the felt should last a minimum of 15 years but that obviously does not cover bad workmanship, silicone will not work on the joints as it will not bond with the bitumen in the felt, the best solution would be to cover leaking area with a new piece of felt bonded to the original felt.


  • #3
    Sonnenblumen
    Registered Users, Registered Users 2 Posts: 5,834 ✭✭✭Sonnenblumen


    Agree silicone would be a waste of time. What's needed is new (torched on)felt flashings. A roll on sealer might also be worth considering?


  • #4
    JDnCoke
    Registered Users, Registered Users 2 Posts: 4 ✭JDnCoke


    Roof in photo isn't torch on. Torch on membranes come in metre wide rolls and you would see the laps at metre spacings, the solar reflective paint would not fully hide them.

    The roof is a poured system but it is impossible to tell from the pic whether it is asphalt or GRP. Either way, silicone would be useless. Temporary stop to an ongoing problem. If it is asphalt then you could patch with a piece of torch-on membrane. GRP would require a patch in the same system.

    Out of curiosity is the problem in the area around the outlet shown? The detailing there looks a little iffy.... Clean GRP job shown in pic.


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