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Housing - Renovation: Roof repair - can I use torch-on felt nailed only, as underlay (instead of 1f)?

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    Hi

    Apologies as this isn't really a "green" building question... But you've been a great help in my other queries, and I'm not having much luck finding an answer on this one.

    I've got a repair to do to my roof. The roof has sarking boards, with 1f felt on top, battens, then slates. I'm repairing a hole in the sarking and felt from where a flue was removed. The whole area to be repaired amounts to approx. 1.2m x 1m.

    I was kindly given some felt to use for the repair. I was told it was 1f but I've collected it and it's actually torch on. In fact, I was given two different rolls. One is this stuff:

    https://www.jtatkinson.co.uk/iko-glass-torch-on-app-universal-underlay-16m-61020216

    The other felt is thicker and I'm guessing is used for the top layer in a torch on system? Photo below of that one....

    My question is whether either of these can be used instead of 1f for the repair? I'm only looking to nail it, as you would with 1f. Or do I need to make a trip to the BM and fork out for a roll of 1f?

    Many thanks
      IMG_20231001_194412397 Small.jpg
    • CommentAuthortony
    • CommentTimeOct 3rd 2023
     
    I would use it, beware of sag, reaction between the two felts if one seeps its oiliness into the other
  3.  
    Thanks tony.

    It's going on top of sarking boards so sag shouldn't be an issue.

    Didn't realise there was a possibility of a reaction though, that doesn't sound good! Is that something specific to using the torch on with 1f? Or can it happen with other felts too?

    Thanks again
    • CommentAuthortony
    • CommentTimeOct 4th 2023
     
    It happens with bitumen/asphalt and sometimes the oils can soak into wood especially when heated by the sun, it is a physical reaction. I frequently see asphalt use between concrete sections in roads ‘bleeding’ up through tarmac

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