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Dormer Roof Insulation

  • 09-05-2008 7:00am
    #1
    Sparky78
    Registered Users, Registered Users 2 Posts: 103 ✭✭


    Hi,
    Can you insulate a dormer room as a ventilated roof as in the attached diagram but use a breather membrane and fully fill the sloped section instead of leaving a 50mm gap?
    Dont want to heat the whole roof if possible as in a warm roof.

    Thanks.

    PS using external insulation as in diagram


Comments

  • #2
    spadder
    Closed Accounts Posts: 985 ✭✭✭spadder


    What is the cross flow ventilator made from?


  • #3
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    if you want to create a warm roof, you can ventilate over the rathers by counterbattening. similar to the diagram at the bottom of this page... you need a 50mm cavity...

    http://www.superglass.co.uk/Roofs.aspx

    theoretically you might be able to do what you suggested, by many certifiers would insist on the 50mm gap to be on the safe side. the ventilation regulations insist on it anyway.


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