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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.

Buy individually or both books together. Delivery is free!


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    • CommentAuthorMike1
    • CommentTimeOct 9th 2017
     
    Lots of good technical reasons given above - it's clearly the way to go, if you can afford it.

    I remember having very similar conversations 30 years ago with clients who weren't convinced that it was worth paying the extra for double glazing compared to single glazing...
    •  
      CommentAuthordjh
    • CommentTimeOct 9th 2017
     
    Posted By: TimSmall
    To be fair, they aren't saying that it's a ph certified component, just that its U value meets the ph standard (with the implication being for cool-temperate).

    Exactly. But since unless the U-value is measured to the PH standard, it probably doesn't meet it (check the definitions for U-value measurement to various standards if you're not clear), it's extremely likely to be greenwash. Hence my doubts about their claims.
    • CommentAuthordelprado
    • CommentTimeOct 11th 2017
     
    I have made enquiries with Residence 9 and apparently it is calculated by an independent BFRC registered simulator who are regularly audited by the BFRC. Is that worth anything? I wish I could share the report with you djh, care you share your email? I'd appreciate any advice :)
    • CommentAuthorDarylP
    • CommentTimeOct 11th 2017
     
    The U-value for a window should be that for the whole window opening, including the window frame.
    Measurements of thermal transmittance in the case of doors and windows should be made according to
    BS EN ISO 12567-1.
    Alternatively, U-values of windows and doors may be calculated using BS EN ISO 10077-1 or BS EN ISO 10077-2.

    .... from SAP 2012, for UK Building Regs.
    •  
      CommentAuthordjh
    • CommentTimeOct 11th 2017
     
    There's a fair summary of the differences between UK standards and the PHI approach in
    https://www.aecb.net/wp-content/plugins/aecb-publication-library/librarian.php?id=8523&file=8516
    •  
      CommentAuthorfostertom
    • CommentTimeOct 11th 2017
     
    Posted By: DarylPThe U-value for a window should be that for the whole window opening, including the window frame
    Not the opening, just the glass and frame. The opening is beyond control of the window manuf, is a matter of architecural detailing.
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