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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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    • CommentAuthordeniance
    • CommentTimeOct 16th 2021
     
    Posted By: bhommelsThe tapes will stick quite nicely to blockwork, or the airtightness paint. And most other things provided there is no dust on the surface.
    Some tapes are pre-folded so you can stick a thin strip of the total width to the window easily and then fold back onto the reveal. I would recommend cleaning the window frame, and make sure the airtightness paint is fully dry and hardened before you stick the tape on as otherwise it might rip it off!

    Edit: I don't think primer is needed, I never bothered with it.


    I couldn’t decide on a tape, dunno whether to get the thin edge with a thick edge or a thick edge with a thick edge, never used a tape before so don’t know what one to get!
    • CommentAuthorbhommels
    • CommentTimeOct 16th 2021 edited
     
    When I was in your position of having to provide an airtight seal between the windows and blockwork I used siga fentrim. This has a thin (10mm), pre-folded strip that can be attached to the window easily. The larger width then folds over and depending on the tape width can cover the straps etc as well.
    In my case the reveals were over 100mm deep, and I taped from window to an airtight membrane that was then taped to the blockwork outside the reveal and plastered over. The reveal was covered with insulated plasterboard going over the airtight membrane and butting up to the window, covering the strip of tape from view.

    Not saying that tape is necessarily better than other methods, but mastics and foam do not seal forever either. When using tapes it is best to bury them in plaster or have other ways of mechanically clamping the tape so that you don't rely on the tape stickyness alone.
    BTW looking at the picture in your first post: I taped all the structural elements prior to plastering: walls to floor, wall to wall (corners), wall to ceiling etc. You only have one chance to get it right!
    • CommentAuthorSimonD
    • CommentTimeOct 17th 2021
     
    Posted By: bhommels
    Not saying that tape is necessarily better than other methods, but mastics and foam do not seal forever either.


    Absolutely, I think it's often a matter of preference and availability, rather than which is better. As we know all materials will degrade.

    Posted By: bhommelsWhen using tapes it is best to bury them in plaster or have other ways of mechanically clamping the tape so that you don't rely on the tape stickyness alone.


    Buried in many of the tape manufacturers data sheets is information regarding limiting UV exposure so yes, absolutely cover for UV protection also.

    deniance,

    you'll unfortunately always find different approaches to these things. I wouldn't sit here and say which is best either, just provide some information on what is available and my own perspective.

    Your choices are whether to use a window sealing tape as per suggestion by bhommels or not together with the Soudal LQ system (which can also be supplemented with either textile tape Soudal Geotextile, or SWS Window tape) around the windows.

    If you decide to use the Siga Tapes, you can use either the Fentrim 20 or Fentrim IS. The Fentrim 20 has holes specifically for plastering over.

    Take a look at the Soudal website for LQ (https://www.soudal.co.uk/pro/products/coatings/air-and-vapourtight-coatings/soudatight-lq) and the SWS system for windows and also the Siga website which provides full instructions for installing Fentrim tapes (https://www.siga.swiss/global_en/products/fentrim/fentrim-20)

    HTH
    • CommentAuthordeniance
    • CommentTimeOct 17th 2021
     
    Thanks all, I’ve ordered some siga corvum from Amazon and I’ll update my progress😂, then I’ll fire some more daft questions at you all!!
    • CommentAuthordeniance
    • CommentTimeOct 24th 2021
     
    First go with the airtight paint! It’s horrible to use! It’s like a paste! Seems to do the trick though!
      D3E75949-425B-40B4-996B-2A3AFB9055D9.jpeg
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