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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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    • CommentTimeAug 2nd 2018
    So your upstand sits on top of OSB, which sits on top of kingspan, which sits on top of OSB, which sits on top of doubled joists? I would guess that will be fine, but I doubt you'll find anybody to take responsibility for it. And again, it doesn't match Tata's sample designs for the roof.

    Apologies about the roof pitch. I got the idea from somewhere that you had 5° pitch, but clearly I was mistaken. That also accounts to some extent for the roof material preference, since it is more likely to be visible with a 10° pitch. EPDM does have a longer guarantee than steel though.

    You need the top layer of OSB to secure the roof down to, and you need the breather because Tata say you need it. So I don't know why you say one or the other is probably not needed.
    • CommentAuthormarsaday
    • CommentTimeAug 3rd 2018
    Yes that is the design and i am making my own roof windows effectively. So no one except me to take responsibility.

    Can you point me to the tata sample designs. I have some info from them and am going on their free install course in 2 weeks. My upstand is 150mm high because their flashing are this height i think.

    I was referring to the breather membrane not being needed, but i am using it anyway.

    My design without a solid perimeter wall of joisting around the window is better in terms of thermal performance because the kingspan in the roof is coupling up with the insulated PB down the sides.
    • CommentAuthortony
    • CommentTimeAug 4th 2018
    If it was mine 28mm marine ply from the bottom of the joists to the roof lights with a batten on the top edge. Min 50mm sheet insulation outside this stepped unit with Ali angle trims on the non stepped sides to form a drip and cover.
    I had a look at the Tata web site and it shows a breather membrane between the top sheet of ply/osb and the steel roofing sheet but does not appear to show a gap for ventilation between any of the 3 said components. If there is no gap how does any condensation get removed?
    • CommentAuthormarsaday
    • CommentTimeAug 4th 2018
    There is no gap i think. No sure how condensation will get removed. hopefully find out on my training day.
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