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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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  1.  
    Timber frame windows in, with a 1" gap to the brick wall opening in some places.

    Almost ready for the render. Does one use expanding foam on the gap then render and then use trims?

    Or trim then render to trim with foam behind the trim from the inside?
  2.  
    Also if rendering old brickwork that has been previously painted would you expect to see a mesh used or similar?

    Render well just be sand/cement based to give a smooth finish on shop front

    There's a mix of new blockwork and the old painted brick. Are the one coat systems any good or not bother?
  3.  
    Don't use expanding foam. It will shrink in the cold and you will get drafts. Use a specialised expanding rubber strip for the purpose. Then a bead that sticks to the window frame and has a mesh on the other side that you render to.
  4.  
    The beads ComeOnPilgrim refers to are often called 'APU rails' or 'APU beads'. No, I don't know what APU stands for. Any EWI supplier can supply, but not sure abpout general merchants. I have never seen such things in mainstream merchants, but you could strike lucky and find a merchant that buys in a 'system'.

    The most commonly-quoted expanding rubber strip is Compriband. Lots of other makes too. Make sure you get the right 'range'. It expands like mad, but is only certified (??) air-tight in a narrower range.

    Check what it says 'on the tin'.

    ... and probably don't render in sand/cement yet, unless the weather is more predictable where you are than it is here!
    • CommentAuthorgravelld
    • CommentTimeMar 8th 2021
     
    Normally you put the Compriband on the window frame before you put it in. If the gap is large enough it is possible to slide it in, but obviously difficult because of the adhesive.

    Definitely the best solution (other brands exist, e.g. Iso Chemie Bloco One).
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