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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.  
    Thats a good question, however from my experience with the walls, which we are filling with rockwool, the insulation on the outside needs to be greater than the level of insulation between studs to prevent a condensation risk which is why with the walls we went with 50mm insulated plasterboards instead to eliminate that risk... we could look at this but also ventilating it well enough might not be that simple given the shape. Definitely worth looking into but i set about trying to make warm deck work as it feels like a more long term predictable solution and seems to be encouraged everywhere i read. I will definitely have a look at this though, thanks.
  2.  
    Just had a chat with Kingspan and 50mm on top of a fully filled cavity would aparently not work due to the fact that the highest insulation must be to the outside to prevent a condensation risk. 100mm of Kingspan to the inside of the joists with a 50mm air cavity above and a cold deck roof would be the alternative cold deck option, but would require 82.5mm of Insulated Kooltherm plasterboard, so wouldn't save very much at all, and I think a warm deck solution is preferred.

    Cold Deck option from Kingspan:
    https://www.dropbox.com/s/q53sm6p3vzr69sl/Cold%20Deck.jpg?dl=1
    •  
      CommentAuthordjh
    • CommentTimeAug 8th 2019
     
    Posted By: nickbartleetJust had a chat with Kingspan and 50mm on top of a fully filled cavity would aparently not work due to the fact that the highest insulation must be to the outside to prevent a condensation risk. 100mm of Kingspan to the inside of the joists with a 50mm air cavity above and a cold deck roof would be the alternative cold deck option, but would require 82.5mm of Insulated Kooltherm plasterboard, so wouldn't save very much at all, and I think a warm deck solution is preferred.

    I don't think whoever you talked to understands what he's talking about. I'd suggest finding somebody who does. Most of the natural insulation suppliers have good people who understand things a lot better, for example.

    Cold Deck option from Kingspan

    Further proof whoever you talked to doesn't understand what he's doing. The outside surface resistance should be taken just above the Thermapitch and the plywood and single ply membrane should be ignored. I hope you don't plan on an internal temperature of 93.08 K (-180°C), that's pretty chilly.
  3.  
    Thanks, I completely take your point and have really been relying on Kingspan and Rockwool for their advice.
    It's certainly beyond my skillset, and Rockwool seemed to echo the same line of thought that the greatest level of insulation has to be to the exterior etc etc.
    Is there anyone you would reccomend discussing this with?
    Thanks, Nick
    •  
      CommentAuthordjh
    • CommentTimeAug 8th 2019
     
    A couple that come to mind are Ecological Building Systems and Natural Building Technologies. There are others and perhaps other people can make some more suggestions.
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