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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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    • CommentAuthormatt1
    • CommentTimeJun 4th 2018
     
    I am building a timber frame house using pre-manufactured panels. The walls internally are covered with a VCL and I am happy with the airtightness up to loft height.

    The loft is a ventilated space and the spec calls for skimmed plasterboard which the frame manufacturer suggests will be a sufficient air barrier. I am considering using a vcl membrane between the plasterboard and the insulation layer.

    Is this worthwhile or will I be OK relying on the skimmed plasterboard?

    Matt
    •  
      CommentAuthordjh
    • CommentTimeJun 4th 2018
     
    Skimmed plasterboard is an air barrier (unless the plaster cracks) but it is not a vapour barrier. So it depends whether you want a vapour barrier, in which case add a VCL, or just an air barrier. Note also that light fittings in the ceiling are a good way of breaking a plaster air barrier.
    • CommentAuthormatt1
    • CommentTimeJun 4th 2018
     
    Thanks for that. It is airtightness I am after as opposed to a VCL. Is there anything I can do to help prevent cracking (and leaks)
    • CommentAuthorDarylP
    • CommentTimeJun 4th 2018
     
    taped joints, and junctions to walls...:wink:
    •  
      CommentAuthordjh
    • CommentTimeJun 4th 2018
     
    Posted By: matt1Is there anything I can do to help prevent cracking (and leaks)

    For leaks specifically the best answer is a VCL and a service cavity so the lights don't break the airtightness barrier. Alternatively there are hoods available that are airtight (sorry I don't know exact details, I chose not to put lights in the ceiling)
    • CommentAuthormatt1
    • CommentTimeJun 4th 2018
     
    Thanks for this. I have seen the hoods and will be using them.
    • CommentAuthortony
    • CommentTimeJun 5th 2018
     
    Overlap the wall and ceiling vb and be careful round loft trap, pipes and wires.

    Fail safe option is to not use downlighters.
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