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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.

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    • CommentAuthorMarkyP
    • CommentTimeSep 4th 2017 edited
     
    my new windows are partially outboard into EWI zone, only about 20 - 30mm inset to blockwork, the rest protrudes pending installation of my EPS. I am foaming around frame where the frame and blockwork overlap, but it's only 20 - 30mm, rest of window frame is outboard leaving not much foam space. I'm looking for belt and braces for air tightness and considering options including a tape applied to the side of the frames where exposed externally, returned over face of blockwork, then parged over with EWI adhesive. Can anyone suggest a tape for this and would love to hear from anyone who's used tape in this context? I've found the brochure and site practicalities to not always match when it comes to tapes!
    •  
      CommentAuthordjh
    • CommentTimeSep 4th 2017
     
    Both Siga and Pro Clima do suitable tapes. I used both in various locations. Sorry I don't remember the exact product name and they may well have changed anyway! You'll probably need the primer as well to stick it to blockwork.
    • CommentAuthorMarkyP
    • CommentTimeSep 4th 2017
     
    in my head I can see a tape which is two different materials - a sticky backed cloth tape for the window to one half then a fleece or scrim type for the blocks. As I think about it, sticking tape to a block and then parging over seems like it would just eventually lift away from the block, and crack where parge transitions from tape surface to block. Better to parge and then bed a tape in that whilst wet, maybe another skim over to bed in?
    •  
      CommentAuthordjh
    • CommentTimeSep 4th 2017 edited
     
    pick the most suitable:-

    https://proclima.com/products/bonding-agents
    http://www.siga.ch/en/product-overview.html

    There are installation instructions that give an idea of how they expect them to be used, or talk to a distributor.
    • CommentAuthorMarkyP
    • CommentTimeSep 4th 2017
     
    thanks. So Siga Fentrim 2 looks like the stuff. 15mm to the window frame and then 85mm to the wall surface. The video shows them sticking it down to a previously parged surface rather than the masonry, assume to provide a decent flat surface to bond to. The bit over the wall is perforated for further parging over/key.

    but blimey, cheap it ain't.
    •  
      CommentAuthordjh
    • CommentTimeSep 4th 2017
     
    Or one of the ProClima (Contega|Extoseal)-*?-EXO?-*? variants, probably with Orcon to assist bonding to masonry. Ask EBS which one.
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