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Roofing advise needed

  • 09-01-2019 10:22pm
    #1
    Bandygirl
    Registered Users Posts: 13 ✭


    Can anyone tell me if an 80s bungalow with a truss roof of 24 inch centres should be redone using breathable or non breathable membrane the existing felt is destroyed and perished. It’s got brown square profile tiles. I ask because the pitch is low typical to most of its age.


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,145 Mod ✭✭✭✭BryanF


    Breathable felt is a better option

    Small money either way

    Can you give some context to the question ?


  • #3
    Bandygirl
    Registered Users Posts: 13 ✭Bandygirl


    BryanF wrote: »
    Breathable felt is a better option

    Small money either way

    Can you give some context to the question ?

    Yeah sorry, just wondering if because it’s an older build if there is a reason for using one over the other. Or the advantage of one over the other. The existing felt I’m guessing is non breathable and there is loads of ventilation on the facia and soffit. So is there a benifit to using breathable membrane that excludes the use of nonbreathable. Thanks


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,145 Mod ✭✭✭✭BryanF


    Benefits are it’s breathable. If you have loads of ventilation at the eaves, you probably haven’t got much insulation pushed in there.

    If your taking of the tiles/slates and re-battening, then use breathable felt with cross battens, this will allow air-flow throughout the slate/tile zone


  • #5
    Bandygirl
    Registered Users Posts: 13 ✭Bandygirl


    BryanF wrote: »
    Benefits are it’s breathable. If you have loads of ventilation at the eaves, you probably haven’t got much insulation pushed in there.

    If your taking of the tiles/slates and re-battening, then use breathable felt with cross battens, this will allow air-flow throughout the slate/tile zone

    Thanks Bryan, can you tell me does the extra cross bracing batten affect the relationship of increasing a gap with the existing facia then or those that need to be replaced too. Or is there some way around that?


  • #6
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,145 Mod ✭✭✭✭BryanF


    If that’s the concern don’t double batten. Just limits the insulation detailing. But you should still use the breathable felt.


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  • #7
    Bandygirl
    Registered Users Posts: 13 ✭Bandygirl


    BryanF wrote: »
    If that’s the concern don’t double batten. Just limits the insulation detailing. But you should still use the breathable felt.

    Thanks so much for your help


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