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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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    • CommentAuthorCranbrook
    • CommentTimeJul 19th 2020
    Has anyone come up with a decent method of isolating the cheeks of the upstands that a roof lantern sits on?
    No, I haven't, but if I were to try I would perhaps be thinking Compacfoam pads with (cheaper) XPS between, assuming that you are talking about a plinth on a flat roof.
    • CommentTimeJul 19th 2020
    What is the roof lantern made from - more particularly, how much does it weigh? And what designs of upstands does the manufacturer suggest/recommend/supply?

    You basically need a frame that's strong enough to carry the weight, insulated on the outside. Depending on the lantern's design you may or may not need insulation on the top of the structural frame and if you do then you need to calculate the loading per unit area and use insulation with adequate compressive strength.

    Also, is the orangery heated? If not, how is it isolated from the heated spaces?
    Is the roof insulation on the inside or the outside of the rest of the roof structure ('warm' or 'cold’ roof?) - obvs the insulation should ideally continue unbroken up to the lantern.
    • CommentAuthorCranbrook
    • CommentTimeJul 20th 2020
    Yes @djh all orangeries I do are heated. @willinaberdeen 99% of the time I do a warm roof.. Our usual method is to build a timber stud upstand which the lantern sits on, then we fill between the studs with 50mm PIR and use a multifoil on the inside of the studwork... but this isn't great tbh in my opinon
    • CommentTimeJul 20th 2020
    If it/they are heated then you're bound by Part L and 50 mm PIR insulation is not legal, let alone green.
    • CommentAuthorCranbrook
    • CommentTimeJul 20th 2020
    I know, thats why im looking for a solution
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