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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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    • CommentAuthorJohan
    • CommentTimeAug 15th 2007 edited
    I'm a bit confused about the thermal performance for external doors.

    If I've read the part L regulation correctly you need to use doors with better a u-value then 2.2W/m2K IF they have more then 50% glazing. Other doors it stats u-value <3.0W/m2K. Is this correct?? :shocked:

    Sounds a bit mad to me! A door without a window should easily achieve less the 1.0W/m2K with a PUR core...

    You also don't need building regs/FENSA cert. to fit a <50% glazed door as I understand it. Is this correct?

    Anyone who can help clear up my confusion? Many thanks.
    • CommentAuthortony
    • CommentTimeAug 15th 2007
    Its all mad you are right!
    • CommentAuthorbiffvernon
    • CommentTimeAug 15th 2007 edited
    It may sound a bit daft at first glance but it's the pragmatic approach to the fact that it's difficult to get a low U-value with solid wooden doors. There are plenty of reasons why solid wooden doors are better than the horrid things with PUR cores.

    I made an oak panelled door recently with the panels comprising two half inch layers of timber separated by an insulating foam layer.
    • CommentAuthorJohan
    • CommentTimeAug 15th 2007
    Biff, do you mind elaborating a bit on that? It what sense is a solid door better?

    I wasn't talking about uPVC doors...there is nothing good with them...
    I ment timber doors with a PUR core for better insulation performance.

    I can see that a solid door may be 'greener' in the sense there are no oil derivatives, but performancewise a door with an insulated core will be better. Don't you agree?

    Besides if you really, really don't want PUR there are also a few Scandinavian and German timber door manufacturers using woodfibre cores for the insulation (similar to pavatex) achieving u-values of <1.5W/m2K, which is substantially better then a solid door!
    • CommentAuthorbiffvernon
    • CommentTimeAug 15th 2007
    I've not seen a wooden door with a PUR filling. Aerogel would be even better. Steel faced doors sometimes have PUR fill.
    • CommentAuthorJohan
    • CommentTimeAug 16th 2007

    Here's a few manufacturers of timber doors with a PUR core all available on the UK market: Dooria, Diplomat, Ekstrand

    Here's one using a pavatex type core: Swedoor (part of Vest-Wood)

    There are several others.

    Anyway, I think I got my question answered. I can fit a new front door myself! :smile:
    • CommentAuthorbiffvernon
    • CommentTimeAug 16th 2007
    Dooria are, I think, composites of wood veneer, aluminium and styrofoam.
    Swedoor are similar, inloving aluminium sheets.
    Ekstrand are made of stuff that could hardly be recognised as coming from a tree.
    Dunno about Diplomat.

    Are there any high performing doors that look like they are made of wood, perhaps because they actually are made of wood?
    • CommentAuthorJohan
    • CommentTimeAug 16th 2007
    Yes, Sauna doors! :cool:
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