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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.

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Commercial build: Lets think laterally I'm £140K over budget

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      CommentAuthorKatymac
    • CommentTimeApr 22nd 2007
     
    Is it expensive?
    •  
      CommentAuthornigel
    • CommentTimeApr 23rd 2007
     
    about the same as most insulation. Cheaper than sheeps wool etc.
    •  
      CommentAuthorKatymac
    • CommentTimeApr 23rd 2007
     
    Thanks - I'll have a google
  4.  
    Regarding polystryrene as an insulation. If you mean expanded polystyrene Kate, usually known as EPS and available at builders merchants under the trade name Jablite, then I understand this is one of the more benign oil based insulants in terms of its manufacture. I remember Tony made the point on another topic some months ago that you could argue that by using oil for insulation you were preventing its use as fuel and therefore saving emissions. I think this is a fair point and for insulating a solid walled structure externally it is perhaps the most practical material in that it will not suffer deterioration from contact with moisture.
    •  
      CommentAuthorfostertom
    • CommentTimeApr 24th 2007
     
    That's right Chris - insulation has a unique position, when considering its embodied energy/petrochemical content.
    It's unique in that lighweightness is its essence, so in a way the less of the petrochemical stuff there is in it, the better it works. At any rate, accepting a relatively tiny amount of 'eco-nasty' petrochemical material as insulation can result in such enormously 'eco-virtuous' petrochemical in-use fuel savings, that the former is so vastly outweighed by the latter, that it's almost riduculous to insist on sheeps wool or something.
    By all means, if sheeps wool etc does as well, then why not go for it - but on the whole the non-petrochemical alternatives
    need greater thicknesses therefore more of other materials to create the necessary void space to fill
    don't have fringe benefits like ease of ensuring no gaps, membranes/airtightness etc
    cost more
    are much more palaver generally.

    Katymac, external insulation with weathershield is a fine alternative to external strawbales as insulation; just make sure the spec is just right. And don't think of insulating internally, is my opinion.
    What's the verdict on the trusses?
    •  
      CommentAuthorKatymac
    • CommentTimeApr 24th 2007
     
    Should know tomorrow
    •  
      CommentAuthorKatymac
    • CommentTimeApr 25th 2007
     
    I do find the idea of that insulation thingie really odd (iyswim)

    I'm trying to get my head round it
    •  
      CommentAuthorfostertom
    • CommentTimeApr 25th 2007
     
    What about that thingle seems odd?
    •  
      CommentAuthorKatymac
    • CommentTimeApr 25th 2007
     
    The idea that polystyrene could be green??
    •  
      CommentAuthorfostertom
    • CommentTimeApr 25th 2007
     
    Oh yes, but a revelation when you get it. Like tiny amounts of fifthy toxic hi-tec chemicals that make up a PV panel (or a computer CPU) but that small amount is so well employed that it generates benefits (including green benefits) that far outweigh its un-greenness - this is how the products of technology should be used - almost homeopathically!
    However, polystyrene isn't so good in this way - it's mid-tec, you need a lot of it and hi-tec ways can work so much better. Or really lo-tec, like straw bales.
    •  
      CommentAuthorKatymac
    • CommentTimeApr 25th 2007
     
    Isn't Hi-tec expensive

    Is this Jablite Chris was talking about Polystyrene?
    •  
      CommentAuthorfostertom
    • CommentTimeApr 25th 2007 edited
     
    Posted By: KatymacIs this Jablite Chris was talking about Polystyrene?
    Yes, Jablite's the best-known manufacturer of the rock-bottom cheap expanded polystyrene (EPS), white, compressed beads, like ricecakes. Then there's the higher-performance extruded polystyrene (XPS), pink blue, green etc, bubbles-in-solid, like an aero bar. Trouble is that, while EPS is dirt-cheap, XPS is almost as expensive as far-superior Cellotex and similar.

    Posted By: KatymacIsn't Hi-tec expensive
    See http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=225&page=1#Item_1

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