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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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    • CommentAuthorDonkey
    • CommentTimeJan 11th 2019
     
    Mike1

    Why do you say "leading with the the outer leaf first"? My builders are leading with the inner leaf and I see the Green Building Store did the same.
    •  
      CommentAuthordjh
    • CommentTimeJan 11th 2019 edited
     
    Posted By: DonkeyWhy do you say "leading with the the outer leaf first"? My builders are leading with the inner leaf and I see the Green Building Store did the same.

    He's simply citing the BBA:

    "The external leaf should be constructed ahead of the internal leaf so that any mortar protruding into the cavity space from the back of the external leaf can be cleaned off before installing the product. Batts must not be pushed into a completed cavity."
    • CommentAuthortony
    • CommentTimeJan 11th 2019
     
    Sounds like small print dreamed up to avoid any claims
    • CommentAuthorMike1
    • CommentTimeFeb 4th 2019 edited
     
    Posted By: tonySounds like small print dreamed up to avoid any claims

    There are reasons behind it:
    1) If mortar is projecting into the cavity, that will tend to compress the insulation, with a negative impact on U-value where it happens
    2) When there is wind-driven rain against a non-rendered wall, the wall can become saturated with to the extent that water can flow down the inner face of the brick or blockwork (I've seen it and the flow rate can be quite shocking). Projecting mortar, particularly at the joins between boards, can lead to some of that water soaking the insulation - not right through (provided the insulation is otherwise installed correctly) - but enough to further reduce the insulation value.
    The overall impact on U-value is probably only a few percentage points and will vary depending on the extent of the mortar projection, but if you're interested in minimizing heat loss then this kind of attention to detail will help.
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