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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Fundamentals: How much insulation should external walls have?

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  1.  
    • CommentAuthortony
    • CommentTimeJun 7th 2009
     
    The recent vote seems to indicating that we dont think that sufficient insulation is being built into walls -- how much should they have?
    • CommentAuthorjamesingram
    • CommentTimeJun 7th 2009 edited
     
    how about AECB silver as a start ,

    http://www.carbonlite.org.uk/carbonlite/silverstandard.php

    moving towards , gold

    http://www.carbonlite.org.uk/carbonlite/goldstandard.php

    I guess you'll find out this winter if 300mm enough
  3.  
    Can we include refurb (with all the attendant restrictions on space etc) in this debate?
    • CommentAuthortony
    • CommentTimeJun 7th 2009
     
    I cant see anything useful on your links james -- sorry
    • CommentAuthortony
    • CommentTimeJun 7th 2009
     
    Why do external walls of existing stock need any less insulation than new ones?
  6.  
    Tony. I am not suggesting they do, but that refurb is full of compromises. I was basing it on James' comment: ''I guess you'll find out this winter if 300mm enough ''. If the insulation project in question was a 3-external-wall 2m wide offshot kitchen then I would sigg 300 is too much. I realise this gets us into a bigger debate re Aerogel, VIPs, demolition etc, but it is a debate that needs debating.
  7.  
    <blockquote><cite>Posted By: tony</cite>I cant see anything useful on your links james -- sorry</blockquote>

    yes ,sorry just a general advert/guide to what could be achieved with better standards of insulation etc.

    so How much insulation should external walls have?

    how about starting at u=0.25 (silver) and moving to passive house/AECB gold standard
    • CommentAuthortony
    • CommentTimeJun 8th 2009
     
    Bit high for me how about aim at 0.1

    It is a very good idea to discuss this in terms of U values though.
    •  
      CommentAuthoragu
    • CommentTimeJun 8th 2009
     
    I think a new build should have walls of 0.15 as the lowest requirements currently but if I was building my own place it would definately be a case of as much as is humanly possible!
  10.  
    yes u=0.25 is a halfway house , but I think it suits refurbs , and if it can really be done at little or no extra cost than current regs work , then its easy to sell .
    If you demand much higher, most refurb work will stop or be done on the quiet
    most people just give lip service to energy effiecency and the enviroment what they really want is
    extra m2 for as cheap as possible.
    time and increased energy prices will probably show them their error of judgement

    new build should be better , i'd be interested in cost comprasions for large cavities and solid block with external insulation as I'm guessing the EWI should come in cheaper,
    did you look into it for your project Tony , I remember you had some planning restraints

    cheers Jim
    • CommentAuthortony
    • CommentTimeJun 8th 2009
     
    EWI would be cheaper but I have used bricks as my external cladding as thin a render is a little too easy to damage.

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