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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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    • CommentAuthorJulio
    • CommentTimeJun 16th 2014
     
    Hi all,

    I am installing a downstairs bathroom in my house. It is situated in the space behind the stairs. Ventilation is a problem as it is essentially on the party wall (terraced house) in the middle of the house. I am going to block up one of the two doors into the space with hemp lime, so that this is a breathable and hygroscopic element that can absorb excess water vapour in the air. So I am not that worried about build up of moisture in the space. But to meet building regs i obviously have to install some sort of mechanical ventilation. I was just wondering if it would be possible/ allowed to run the ventilation straight into a exempt and empty chimney breast? This would negate the requirement for a lot of ducting and making a hole in the front of the house.

    Thanks
    • CommentAuthortony
    • CommentTimeJun 16th 2014
     
    Can't see why not, it would cause heat loss unless you fit a shutter or valve in to it.
    • CommentAuthorjfb
    • CommentTimeJun 16th 2014
     
    wouldn't it lead to warm moist air rising up chimney and condensing as it goes up the colder chimney. A hemp/lime door isn't going to stop moisture being ventilated.
  1.  
    My thoughts, jfb.
    • CommentAuthorSeret
    • CommentTimeJun 17th 2014
     
    How much moisture btw? Is there a shower/bath?
    • CommentAuthorJulio
    • CommentTimeJun 17th 2014
     
    Seret: There is a shower in the bathroom, so there will be a fare amount of water vapour created.

    JFB: My thinking with the hemp lime wall is that it would help absorb any spikes in humidity (e.g. after a shower), and then would then allow the water vapour back out during periods of lower humidity.
    Also isn't there always a risk of some condensation in chimneys? Warm air rising, meeting cold air etc etc.

    I can't find anything in the regs about this, was wondering if I has missed something?
    • CommentAuthortony
    • CommentTimeJun 17th 2014
     
    I reckon that if it does happen it will be dried out by the next lot of warm dry air that will be going up there.

    Try it and see, it could be diverted, ducuted or insulated etc afterwards.
  2.  
    Being under the stairs could you not duct under the timber floor to an external air brick If the run was short and you could access for an insulated duct
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