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Replacing roof covering on flat dormer roof

Discussion in 'Roofing and Guttering' started by d1rtym0nk3y, 23 Feb 2019.

  1. d1rtym0nk3y

    d1rtym0nk3y

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    We have a small dormer with a flat roof that joins into a tiled roof. The ridges run slightly awkwardly over the back edges of the flat roof as you can see in the photo below

    [​IMG]

    [​IMG]

    Somewhere there is a leak, although i can't see anything obviously failing, when we get heavy rain we have water getting in somewhere.

    I'm thinking about removing the felt and replacing with a one piece EPDM, which I've used before on sheds and garages with good results. What i'm not sure about is how to deal with the areas where the ridge tiles are bedded onto the felt, and the run off area, which tbh doesn't look like a great detail

    Any suggestions on how to rework this ?

    Many thanks
     
    Last edited: 24 Feb 2019
  2. datarebal

    datarebal

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    Assuming the felt is bonded properly ( can't see any beads of bitumen)
    More. Pictures of the point where the Arris joins the tiled roof taken from the outer edge showing how the join has been made.
     
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  4. d1rtym0nk3y

    d1rtym0nk3y

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    Hi datarebal,

    Here's a few more shots, thanks for taking a look

    [​IMG]
    [​IMG] [​IMG]
     
  5. datarebal

    datarebal

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    Good pictures, it looks like there is a small fault on the top edge of one arris rail upstand.
    The layout does channel most of the water towards the hip. Not ideal. Where is the leak
     
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  7. d1rtym0nk3y

    d1rtym0nk3y

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    The leak has appeared along a join in the plasterboard, roughly in line with where the felt meets the tiles, and is worse on the side opposite the outlet.
    Difficult to say if that's related to the location of the leak or just where it is running to.

    Do you think its feasible to redo this detail in EPDM?

    An alternative would be to pull up the deck and adjust the firrings so the deck runs to the front edge of the dormer. Install kerb trims either side and a drip and small gutter along the front edge. Not as neat, but might be better than having water run towards the hip
     
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