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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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    • CommentAuthordelprado
    • CommentTimeSep 26th 2017
    Has anyone used/have experience of both for sealing windows?

    Every window fitter I speak to seems to still be using foam, then silicone, etc on the outside. This is disappointing because I understand tape is much better thermally, acoustically and in terms of water repellency. They seem to cite nebulous reasons as to why the tape "doesn't always work"
    I used two strips of expanding tape between the window frame and timber frame. One on the outside edge and one on the inside edge. I also used Soudal low expansion foam behind the plasterboard on the reveal. The outside reveal is covered with cedar boards.
    • CommentAuthordelprado
    • CommentTimeSep 26th 2017
    Does this mean that you actually created a timber frame and then put windows into a timber frame? So it had two frames?
    I think the *house* has a timber frame.
    • CommentAuthorDarylP
    • CommentTimeSep 27th 2017
    IsoBloco or similar.
    Brilliant stuff, PU foam with a air-barrier on the o/s.
    Comes on a roll, a bit like CompriBand.
    Keep it in the fridge till you need it, as once it expands, that's it...:devil:
    With the movement in TF, anything else is asking for trouble done the track IMHO.....
    Posted By: delpradoDoes this mean that you actually created a timber frame and then put windows into a timber frame? So it had two frames?

    As Nick said it's a portal timber I-beam framed house. The windows are made from Rehau profiles and the Compriband tape sits between the I-beam and the window frame.
    Used Soudal low expansion foam on our triple glaze units direct into the stone mullions. Used lead barrier to protect glaze units from the foam. Then sealed with traditional burnt mastic both internally and externally. Has made a very good seal.
    • CommentAuthorrevor
    • CommentTimeSep 28th 2017
    I am using silicon, compriband and expanding foam on my current installation of Velfac units. I remove the aluminium sash from the frame and fit the wooden frame. Then I insert the relevant size of backer rod into the gap between frames or frame and wall and silicon over it. This gives an hour glass cross section to the silicon as it provided a better seal between 2 points rather than 3. I then replace the glazed aluminium frame and use compriband or iso bloco or similar between frames over the silicon where relevant. On the inside I then fill with expanding foam. It is only recently that I have come across the backer rod system and I think it is a great way of making a seal. The compriband or similar gives a very professional finish much better than a silicon look. I have also used compriband on UPVC window particularly under cills where it sits on a slate cill. Its important to get the correct silicon I have been using ARBO silicon they have a range for different situations.
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