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roofing membrane...breathable or not

Discussion in 'Roofing and Guttering' started by 600rob, 11 Jul 2020.

  1. 600rob

    600rob

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    I need to replace some of the roofing felt in a few places at around the eaves level on my house.

    If i cut back the old bituminous felt to where it has not rotted away, are the new modern membranes compatible with the old traditional felt and do i need any sort of joining tape?

    also would i need breathable or non breathable membrane?

    the house has soffit vents all round and from what i can tell does not have issues with condensation.

    cheers
     
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  3. datarebal

    datarebal

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    why not just replace like for like 1f is making a bit of a come back.

    you can use breathable underlay and you will not need tape, just make sure it is secured down to prevent flap and buzz

    underlay support trays are a good upgrade
     
  4. SpecialK

    SpecialK

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    Would an eaves repair board reach in far enough?
     
  5. datarebal

    datarebal

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    if you mean underlay support tray, it might . It depends on your felt and roof covering
     
  6. 600rob

    600rob

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    That was the plan but the eaves tray does not reach up far enough.

    plan b is to trim the damaged felt, remove the first tile lath then fit a new piece of underlay under the old one with as much overlap as possible then re fit lath/tiles etc.

    I guess the old 1F is not breathable so shouldn't make much difference if i repair a small section uising a non breathable membrane
     
    Last edited: 11 Jul 2020
  7. SpecialK

    SpecialK

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    I'm not a roofer but that is pretty much what I did when I took my chimney down.

    Other option is to chop the edge off an eaves repair board and use two to make up the extra distance?

     
    Last edited: 12 Jul 2020
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