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Sealing breached felt

Discussion in 'Roofing and Guttering' started by sha256, 8 Jan 2016.

  1. sha256

    sha256

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    I have drilled a 100mm hole through the side of my flat roof for some venting. The hole has breached the felting. What can I use to create a water tight seal between the plastic vent and felt ? I was going to using general purpose silicone but someone mentioned they used it and the bitumen started to seep through the felt???

    Also, should I seal the hole first with some flashband ?
     
  2. terrypin

    terrypin

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    sorry, wrong thread.
     
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  4. Burnerman

    Burnerman

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    Silicone would probably be fine, but Geocell do a kosher roofing sealer - screwfix 32561. Failing that, and depending on the gaps involved, consider Evercryl (MKM) or Aquapol.
    John :)
     
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  5. sha256

    sha256

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    Cheers John. Just to confirm, should I use the sealant between the brick and felt or the felt and vent ?

    Regards
     
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  7. Burnerman

    Burnerman

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    This stuff remains pretty flexible and does accommodate movement of the felt in the summer months. Apply some in both places you mention to get a good seal.
    Just for interest....you say you have drilled a hole in the side of your flat roof.....can you give us a pic, do you think?
    John :)
     
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