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Flat Roof Insulation

  • 18-04-2012 8:42pm
    #1
    cgc5483
    Registered Users, Registered Users 2 Posts: 643 ✭✭✭


    Looking for some advice. Have renewed a flat roof over a kitchen extension. I'm getting a lot of conflicting information on the best method to insulate.

    The roof rafters are 9" * 2*with 18mm plywood on top and torch on felt above this. The original plan was to put a 100 mm PIR board between the rafters and then foil back plasterboard on top. The roof has about a 8 degree pitch.

    Some people are advising against this and suggesting that I put rockwool between the rafters and then a warmboard over this. Others a PIR board between and then foil backed board. I'm getting confused as to what is the best way forward.

    Any ideas and reasoning as to the best way forward. I want to get the best insulation i can for the future. Thanks.


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