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General: airtightness of windows?

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  1.  
    • CommentAuthorchriskemp
    • CommentTimeJul 19th 2012
     
    Should window manufacturers know/test how airtight their frames are under pressure?

    for example if a house is being built with a predicted airtightness of X, should the window manufacturer be advised? and should a builder get confirmation that the window frame will offer X?

    I foresee windows being the weak link in a SIP-build?
    is this the case?
  2.  
    I was under the impression they did airtight tests on samples, as there's a miniuim requirement,
    and this data was available.
    • CommentAuthortony
    • CommentTimeJul 19th 2012
     
    lots of windows leak through the frames even more round the frames
    • CommentAuthorJoiner
    • CommentTimeJul 19th 2012
     
    Wasn't achieving airtightness one of the reasons given for preferring open-in windows in passive-house?
    •  
      CommentAuthorfostertom
    • CommentTimeJul 19th 2012
     
    Until they found they cd do triple seals in open-out.
    • CommentAuthorJoiner
    • CommentTimeJul 19th 2012
     
    :bigsmile:
    •  
      CommentAuthorjoe90
    • CommentTimeJul 19th 2012
     
    I would have thought that air pressure from the outside-in was greater than inside-out leading to open out windows being more airtight (i.e. windows pushed into their seals by wind etc) ?
    •  
      CommentAuthorfostertom
    • CommentTimeJul 19th 2012
     
    If positive on windward side, it's going to have extreme negative points on the turbulent lee side. That stuff often claimed about wind pushing inward is I think simplistic. Any wind is suck as well as blow.

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