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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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    • CommentAuthorSwarm
    • CommentTimeSep 3rd 2015
     
    I'm looking at new windows and doors and for one manufacturer, they have a passive certified window with three seals vs their standard unit with just one seal. Both are triple glazed.

    Likewise, their door product, although well insulated (60mm) to about 1u, only has one seal.

    What I'm wondering, is if anyone has any thoughts, research or experience with how good an airtightness, just one seal can provide. Hopefully someone can come and say they achieved PH air tightness level with a one seal window + door. :)

    I do like the idea of having three, in case one or two fail later on! But on price, the 1 seal door + window are very attractive.
    •  
      CommentAuthordjh
    • CommentTimeSep 3rd 2015
     
    Posted By: SwarmHopefully someone can come and say they achieved PH air tightness level with a one seal window + door. :)

    I can say that locking our front door, which pulls all the seals tight, made a measurable difference to our airtightness test result.

    As regards the two products you are comparing, can't you see the difference in the test results? You need both under and overpressure test results and preferably at higher pressures than 50 Pa to understand how the products differ.
    •  
      CommentAuthorfostertom
    • CommentTimeSep 3rd 2015 edited
     
    It's not just airtightness - a single seal allows cold outside air only the seal's thickness away from inside air, over a considerable length of line, even if smallish width. 2 seals create an intermediate chamber. The weak point of any window.

    Not Russell Timbertech by any chance? their 4-12-4-12-4 Uw1.1 supreme-value windows have only a single seal as standard. Their approach to PH standard is simply to deepen the same timber sections by 15mm, inside to out, allowing 4-16-4-16-4 glass, at disproportionately inflated price (how that alone achieves PH standard is surprising).

    That same but deeper section allows room for a second seal. Its groove is also present in the smaller section, but can't be used because the scissor-action hinges cross it. However, with the butt hinge alternative, the groove is clear and Russell have in the past kindly thrown in a second seal for free.

    Check that possibilty with your supplier. Or even machine your own groove!
    • CommentAuthortony
    • CommentTimeSep 3rd 2015
     
    All my windows have four seals on them, only the door that I built myself has only two levels of seals
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