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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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    • CommentAuthormomo101
    • CommentTimeJun 15th 2007 edited
    Hi all,
    We are in the process of rebuilding the outer shell of our conservatory / extension which is currently split (partition) as a bathroom and small storage area. At present, the structure of the building consists of thin wooden Victorian walls and a lean-to felt rood. It is in a very bad state and the room is always extremely cold. We would like to replace the walls with a more solid structure, that is well insulated and would allow heavy fixtures (wall units). We were thinking of using the brick - gap (for insulation) - concrete block approach for the bottom of the walls with windows across the top 2/3 rds (not the bathroom section) but this would eat up on the very limited interior space . Are there any alternative cost effective approaches that would produce a well insulated space that is thin as possible, can handle fixtures and can cope with a lean-to tiled roof?

    Thanks in advance.
    • CommentAuthorJohan
    • CommentTimeJun 15th 2007
    You could use 140mm deep timber studs, timber cladding on the outside and vapour barrier on the inside. If you fill that with Warmecell you'll get a U-value of roughly 0.25W/m2K, not too bad. :smile:

    To handle high loads you could just use Fermacell or Sasmox gypsum fibre boards for the dry lining on the inside, they'll easily cope with your wall units (as well as being made from recycled materials).

    The insualting properties for a brick/block construction with the same thickness as a timber frame will never be as good!
    I'm just replacing a conservatory with a sun room extension. I have tried to maximise internal space by building the walls in single skin solid 100mm concrete blocks set on the edge of the slab and externally insulating with polystryrene between batons finshed with a timber rainscreen. I'm putting 50mm between batons at 600 mm centres then putting batons the other way with another 50mm between them.
    • CommentAuthormomo101
    • CommentTimeJun 16th 2007
    Would either wood construction or single block construction be strong enough for a tiled pitch roof? can you actually tile an existing lean-to felted roof (avoiding the need for building of a new roof)? I also think by reducing the amount of space of the walls that is glass will reduce heat loss.


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