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Shed roof insulation, barriers and ventilation

Discussion in 'Roofing and Guttering' started by PeteWilliams, 5 Jun 2020.

  1. PeteWilliams

    PeteWilliams

    Joined:
    21 Dec 2010
    Messages:
    61
    Thanks Received:
    1
    Location:
    Surrey
    Country:
    United Kingdom
    Hi,

    I'm building a large pitched-roof shed which will mostly be used for storage but also as a gym to house the wife's treadmill, rowing machine etc. As such I was going to insulate it.

    For the walls, I was planning on filling the stud voids with loft insulation in between the breathable membrane and vapour barrier.

    For the roof, I'm less sure on what I need to be doing as I'm seeing conflicting advice.
    I'm told I don't need a breathable membrane, but I'm not sure if I need a vapour barrier.

    I'm also not sure if I need to leave a gap (50mm?) between the insulation and the roof's OSB?
    And do I need to add some form of eaves ventilation to get airflow into that gap?

    Thanks

    Pete
     
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