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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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    • CommentAuthorgravelld
    • CommentTimeAug 2nd 2018
     
    Say you were bricking up a window, or making a window smaller in a cavity wall construction.

    I'm wondering whether the simple approach of mimicking the current construction is the best way.

    What about only bricking up the internal leaf, and having the cavity and outer leaf replaced by some insulation?

    I'm assuming there's an existing lintel over external leaf of course.

    It might make for improving the installation performance of replacement windows (as well as the wall itself of course).
  1.  
    I would have no problem with that except consideration would have to be given to matching the exterior finish.
    • CommentAuthortony
    • CommentTimeAug 3rd 2018
     
    The lintel and revels are lovely to be thermal bridges

    There may not necessarily be a lintel in the outer skin.

    I would do some breaking out, remove the reveals, rebuild the inner skin toothed in, insulate the cavity same as existing, then you can do what you like with outside skin.
    • CommentAuthorgravelld
    • CommentTimeAug 3rd 2018
     
    Yeah, I wondered about the finish. It's rendered, but I wondered if having a very different material (e.g. EPS) would make cracks more likely to form?

    Tony what does "toothed in" mean?
    • CommentAuthortony
    • CommentTimeAug 3rd 2018
     
    Inner skin blockwork not with a straight join to the existing wall but part blocks cut out and new ones boned in as if it was one wall rather than a wall with a square panel of blockwork in it, best also to use the Sam blocks as original builders did.
  2.  
    Posted By: gravelldYeah, I wondered about the finish. It's rendered, but I wondered if having a very different material (e.g. EPS) would make cracks more likely to form?

    If you cover the join with glass mesh as used in EWI and feather in the render I would expect it to be OK. I would expect more of a problem matching the colour and finish between the new and old. If the wall is not too big the usual recommendation would be to re-render or re-paint the whole wall to make the change invisible.
    • CommentAuthorgravelld
    • CommentTimeAug 3rd 2018
     
    Whole wall to be repainted. By finish do you mean granularity of the render?
  3.  
    Posted By: gravelldBy finish do you mean granularity of the render?

    Yes
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