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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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  1.  
    Our house is fully double glazed – in wooden frames - but it seems we constantly have to replace them as they don’t last long. And at GBP100 a shot (for a mere 45x45cm piece of glass) that soon mounts up.

    We lived in Sweden is the 1980s, in a house only some 10 years old at the time, and there they had an entirely different approach to double glaze. The window simply had a double casement, each single glazed, but one which opened outwards and one that opened inwards. It worked a treat. We were never cold (even at -25C outside) and the windows rarely fogged up – and even if they did, it was a simple matter to open the inner pane and wipe the glass. The rubber insulation round the windows was also of better quality than I’ve ever seen over here in the UK.

    These days sealed units are much more common in Scandinavia but two weeks ago we stayed in a brand new hotel in Norway, which has a similar solution to double glaze to our house in Sweden. Only this time the window opened outwards only and with the inner and outer casement being hinged together.

    We are thinking this would make a much better long term alternative to our sealed units here. Does anyone know of a supplier in the UK?
    •  
      CommentAuthorfostertom
    • CommentTimeJul 23rd 2008
     
    DG units have shortened life if puttied-in or solid bedded in mastic. They shd be dry-glazed with pressure tapes and drained airspace between the seal-edge of the unit and the timber rebate. That way the glass can expand and contract a bit without subjecting the seal to mechanical pressure; also the seal stays dry instead of possibly being kept wet by water trapped in a void within the mastic.
    • CommentAuthorjoe.e
    • CommentTimeJul 23rd 2008
     
    £100 for a 450mm square DG unit seems a bit steep - am I out of touch? Is that the going rate these days? Alwantstobegreen, are you getting your units direct from a manufacturer or from a glazing company?
    • CommentAuthorCWatters
    • CommentTimeJul 23rd 2008
     
    What fostertom says...

    Small flat spacers not wedges should be used under the bottom of the sealed units to support both panes equally and provide a drainage gap.
    • CommentAuthorbiffvernon
    • CommentTimeJul 23rd 2008
     
    £100 per square metre would be very expensive.
    • CommentAuthorjoe.e
    • CommentTimeJul 23rd 2008
     
    I thought it was expensive. If that is what you've paid previously, look in the yellow pages for a manufacturer of DG units and get a price. There are lots of people selling them and fitting them, but surprisingly few actually making them.
    Re what Fostertom says, glazing like that is also very good for the wooden frames. Otherwise moisture gets behind the putty (and especially silicon, where used) and (in extreme cases) rots out the window from inside. The rebate should be given the same finish as the exterior - paint or whatever.
  2.  
    Thanks for your feedback. The £100 is the price of unit and fitting by a nearby glazing company (6 miles away). Having paid £70 to another company three times and having two of the units go again within 3-5 years I decided to try different company.
    The fact is that of the 20 panes installed 8 years ago in our extension, 7 have blown (including one twice). (This compares with 46 DG panes installed in 1990 by the previous owner in much better hardwood windows - none of which have blown).
    How the latest units were fitted I know not - I left that to the installers. By the look of it each has done it in their own way. The rebates have been stained the same as the rest.

    HOWEVER - I am still interested if anyone has come across double glaze windows of the type I described in Scandinavia. That sort will always been cheaper to replace and can't 'blow' anyway.
  3.  
    Posted By: AlwantstobegreenThanks for your feedback. The £100 is the price of unit and fitting by a nearby glazing company (6 miles away). Having paid £70 to another company three times and having two of the units go again within 3-5 years I decided to try different company.
    The fact is that of the 20 panes installed 8 years ago in our extension, 7 have blown (including one twice). (This compares with 46 DG panes installed in 1990 by the previous owner in much better hardwood windows - none of which have blown).
    How the latest units were fitted I know not - I left that to the installers. By the look of it each has done it in their own way. The rebates have been stained the same as the rest.

    HOWEVER - I am still interested if anyone has come across double glaze windows of the type I described in Scandinavia. That sort will always been cheaper to replace and can't 'blow' anyway.


    I remember them when I was a ski bum in Austria, in the old Pensions...

    I have recommended this set up as a retro-fit solution by installing an extra window internally, works well!
    • CommentAuthorbiffvernon
    • CommentTimeJul 24th 2008
     
    >The £100 is the price of unit and fitting

    Ah, it's the labour of fitting that costs. The firm is probably paying about £50-£60 per square metre for the units. Labour is always the biggest part of such jobs.
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