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corrugated sheet steel over insulation board?

Discussion in 'Roofing and Guttering' started by fergycool, 12 May 2009.

  1. fergycool

    fergycool

    Joined:
    12 May 2009
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    Location:
    Cambridgeshire
    Country:
    United Kingdom
    Heyho,

    (my first post so be gentle!)

    I'm renovating a brick shed's flat roof as part of a conversion to a garden office/workshop/den. The shed has a slightly sloping roof of 3x3 Metres with a pitch (if you can call it that!) of about 3 degrees (one wall is 2 courses higher than the opposite. I'm using TR31 boards (see link at end) over the joists, which are attached directly on top of a wall plate and overhang by 200mm either end. These are insulation with a vapour barrier and a plywood top. My original plan was a rubber membrane directly over the TR31 boards. However, on reflection it's a rural area with a mixture of farm and residential. The majority of buildings other than houses have corrugated steel roofing, and so I am considering this instead.

    I'd be grateful for some advice on:

    How should I attach the corrugated steel sheeting to the top of the TR31 boards? I'm concerned about possible wind uplift. Should I attach straight through the TR31 boards and directly into the joists below?

    What type of membrane/felt (if any?) should I use above the TR31 boards
    and below the corrugated sheeting? They're not supposed to get wet at all. Would a standard roof tile underlay tiles work here? It would be completely hidden from view.

    http://www.insulation.kingspan.com/ireland/tr31.htm

    Cheers
    Ferg
     
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  3. fergycool

    fergycool

    Joined:
    12 May 2009
    Messages:
    8
    Thanks Received:
    0
    Location:
    Cambridgeshire
    Country:
    United Kingdom
    Bad etiquette to reply so soon to your own topics I know....

    Kingspan have recommended that I use a breathable membrane under the corrugated sheeting and above the TR31 boards.

    Cheers
    Ferg
     
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