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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Fundamentals: Swans neck bends

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  1.  
    • CommentAuthortony
    • CommentTimeFeb 24th 2012
     
    Why oh why are swans neck bends (also called offsets) generally made up of two 112.5 degree bends.

    135's would work a whole lot better and wouldnt block so easily or often

    I have seen so many clugged up that others must have too -- is there any hope of a change.
    • CommentAuthorowlman
    • CommentTimeFeb 24th 2012
     
    I suppose tony, it's so that with wide soffits, the second down facing offset doesn't end up halfway down the wall.Lindlab and other German suppliers of Galv rainwater systems often have a different approach to downpipe connection, in various angles and smooth transitions, plus bigger bores.
    • CommentAuthorCWatters
    • CommentTimeFeb 24th 2012
     
    Can you make your own out of two bends?

    http://www.coppagutta.co.uk/round_downpipe.htm
    •  
      CommentAuthorfostertom
    • CommentTimeFeb 24th 2012 edited
     
    Funny they don't include comparison with galv steel (Lindab etc)

    Plastic Aluminium 0.7mm Cast Iron Copper 0.6mm
    Embodied energy
    80 MJ/J² 153 MJ/J² 75 MJ/J² 50 MJ/J²
    CO2
    2.5 KG/Sq M 8.74 KG/Sq M 3.9 KG/Sq M 3.85 KG/Sq M
    Life expectancy of the guttering*
    10 years 25 years 50 years At least 100 years
    Cost of typical installation
    £320-890 £2550 £3420 £1600

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