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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorPDobson
    • CommentTimeMay 13th 2007 edited
    Does anyone know how different/how much better Tri-Iso super 10 would be compared to Thinsulex used in combination with 70 to 90mm PU foam in a warm roof setup with 150mm rafters. Does anyone see a problem with the scenario shown on the Thinsulex web site with the Thinsulex directly trapped between the rafter and the plasterboard without the use of counter battens. This scenario seems to cut about 25mm from the roof depth – not much I know but every little bit helps.

    If Tri-Iso 10 is much better and I am missing out by not using it perhaps I should ditch NHBC who wont let me use it. Does anyone know if Premier or Build Zone are more amenable to new materials?
    • CommentAuthorPDobson
    • CommentTimeMay 13th 2007
    Sorry - New to the forum - just realised there is quite a discussion on multifoils on the Products section - probably should have posted this thread there. :shamed:
    As you say there is a massive amount of info on this subject, particularly on the previous board, but to save you time my understanding is:
    Thinsulux when combined with other insulation materials has all the necessary approvals and will be acceptable to Building Control Officers and NHBC.
    Tri-iso has no current approval (although still being allowed by some councils) but can be used, like Thinsulex, if combined with other materials. In this case a U-value of only 1.7 can be ascribed to the Tri-iso rather than the 5 or 6 claimed by the manufacturer.
    In my opinion using Tri-iso combined with other material would give better insulation than Thinsulux, but if installed as manufacturer recommends would take up more space.
    Charlie, I think you mean R-values don't you?
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