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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - New Build: PIR/PUR in inverted roofs

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    • CommentAuthorEd Davies
    • CommentTimeNov 29th 2011 edited
     
    The Green Building Bible Third Edition, Volume 2, Appendix A, talking about PIR/PUR says:

    These products are suitable for virtually any thermal insulation application. The main exceptions are applications where extremely high compressive strength is required...

    Fine.
    ...and inverted roofs.

    What's that about? I thought these foams were classically used for inverted roofs.
    • CommentAuthorSaint
    • CommentTimeNov 29th 2011
     
    Ed, no never, they have to be protected by the waterproof membrane. XPS is the only insulation for inverted roofs
    • CommentAuthorEd Davies
    • CommentTimeNov 29th 2011
     
    Ah, thanks. Just done some Googling, "inverted roof" doesn't mean quite what I thought it meant. I thought it was having (most of) the insulation above the structural bits whereas it's actually having it above the waterproof layer.
    • CommentAuthorwookey
    • CommentTimeDec 1st 2011
     
    Exactly. 'Warm roof' (insulation (mostly) above the structure) vs 'inverted roof' (insulation above the waterproofing layer).

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