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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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    • CommentAuthormw116
    • CommentTimeApr 19th 2015
     
    There have been a number of threads on how to deal with unused chimneys on here, this one http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12781&page=1#Item_16 provides a good summary of how to treat those that run through the loft.
    I have a slightly different problem. We are renovating a Victorian property with 8 flues in 4 stacks on the end walls, and with a hipped roof, they do not appear in the loft. We do not want to use most of the flues, and would like to seal them in some way to prevent heatloss and damp problems. What does the collective wisdom advise?
    • CommentAuthortony
    • CommentTimeApr 19th 2015
     
    What will you use the ones you want to keep for?

    In the old days I would have said air vent on the outside low down and rain cap them at the top or air brick and launch over.

    Now I would take them down, EWI and not need them.
    • CommentAuthormw116
    • CommentTimeApr 19th 2015
     
    Herself would like a fire of some description (living flame gas fire is the current favourite) in the lounge and possibly dining room. She doesn't want to remove the chimney stacks (they are part of the character of the property). I want to reduce their cooling effect.

    Would a steel plate at the bottom, loose fill with vermiculite / leca or similar to above ceiling height, airbrick above roof, and rain cover on top of pot work?
    • CommentAuthortony
    • CommentTimeApr 19th 2015
     
    I would be more nervous about doing this on an external wall chimney, will you have any wall insulation done ever?

    I reckon it would work - filling it that is, myself I prefer polystyrene beads as they can't absorb water and are easy to remove as well as simpl to pour in from the top.

    The thermal losses up the stack will be high possibly keeping it slightly warm and dry and preserving it from decay, remove that wasted heat from it and things could change.
    • CommentAuthormw116
    • CommentTimeApr 22nd 2015
     
    The ultimate intention is to add EWI to the side and rear walls (front has been excluded on "character" grounds), which would cover the outside of the flues below roof height, not sure what to do above.

    Having had another look, some of the chimney pots might have a lead flashing cover on them, and are either vented internally or externally (total lack of consistency in treatment!).
    • CommentAuthortony
    • CommentTimeApr 23rd 2015
     
    With the EWI I would fill redundant flues with eps and ventilate well above ceiling level, top and at ceiling level, using the one you want as normal, you could get condensation in that one at times above roof level.
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