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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Building Regulations and Standards: Part L and external doors

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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
     
    biff,

    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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