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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.

Buy individually or both books together. Delivery is free!


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  1.  
    At risk of repeating others, it depends a huge amount on the particular wall, and the location. A cement-pointed west-facing wall in Bristol is a totally different proposition from a south-facing stone-and-lime wall in Sussex. The key factors are how much rain penetrates in and how easily can it dry out.

    The various guides are helpful but if they are to be applied widely then they have to be very cautious. The effect of this caution is that many walls have remained uninsulated or poorly insulated, which could have been easily well-insulated. The building trade (including expert guidance) are naturally cautious because they carry the risk if there is damp, whereas the householder and the planet carry the risk if there is insufficient insulation.
  2.  
    Posted By: Nick ParsonsThe 'Bristolian's guide...' is good, but IIRC the author is fairly dogmatic that 60mm WF should not be exceeded. Other opinions exist. I usually used 100mm Pavadentro (with its 'mineral functional layer') when it was available, but do your homework. 60mm would be 'safe', I think, in most situations (on the right sort of substrates, of course), but be prepared to stand your ground when BCO is looking for 0.3W/m2K. (The 'get-outs' are in AD L1B)


    Nick, thanks for that, I’ve seen a post regarding the building regs clause on limiting thickness that needs to be cited for building control purposes. And I’ve heard you speak favourably about Pavadentro before. What do use now that it’s discontinued?
  3.  
    Posted By: WillInAberdeenAt risk of repeating others, it depends a huge amount on the particular wall.

    The various guides are helpful but if they are to be applied widely then they have to be very cautious.


    Good point. I almost shelved my IWI project completely following some of the guidance I’ve read
    • CommentAuthorbxman
    • CommentTimeJan 5th 2021
     
    you might learn something from spending 30 mins watching this who knows ?

    https://www.youtube.com/watch?v=UYTbMi2Jgfk&feature=emb_rel_end
  4.  
    <blockquote><cite>Posted By: bxman</cite>you might learn something from spending 30 mins watching this who knows ?

    <a href="https://www.youtube.com/watch?v=UYTbMi2Jgfk&feature=emb_rel_end" rel="nofollow">https://www.youtube.com/watch?v=UYTbMi2Jgfk&feature=emb_rel_end</a></blockquote>

    That video was one of the first things that switched me on to the benefits of IWI - and to highlight the risks of condensation. If you scroll through the comments he says there’s a problem with condensation forming on the electrical socket back boxes in one of the insulated rooms
    • CommentAuthordaveking66
    • CommentTime12 hours ago edited
     
    Posted By: Daveking66 the Steico supplier (Ecomerchant) has advised that their boards should be covered with a layer of waterproof plasterboard if used in a bathroom -


    Good news, two suppliers (Unity Lime and Mike Wye) have now advised that I won’t need to add a layer
    water resistant plasterboard in the bathroom.

    There’s obviously a risk I’m listening just to the advice I want to hear, but the addition of a water
    resistant Layer of board (to prevent ingress of water moisture) seemed to defeat the whole
    purpose of a breathable system.

    Just need to find a system for insulating the pitched section of ceiling now! (which I’ve raised in another post). Thanks for all your comments
  5.  
    If they are happy and the walls are not (and are never) going to be covered in impervious coatings/sheets then go with their view. They are both reliable sources. NBT used to do 'free' (you paid for it in the material price, of course) WUFI (interstitial condensation) calcs, which were v useful. I don't know of any supplier which does these now, and if anyone tells me of one I will probably use them!!
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