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Airtightness at Corner Window Post

  • 16-02-2016 9:12pm
    #1
    jiggins
    Registered Users, Registered Users 2 Posts: 33 ✭


    We had a corner window fitted to a Keylite corner lentil/post without any airtight measures in our new build.

    Now that this has dawned on us we are unsure of how to remedy the situation with minimum disruption.

    There is a plastic trim mechanically fixed between the window frames and the corner post.

    Option 1 is to remove this, which would be difficult but should we have it removed then we could tape from one window frame to the other - quite difficult, delaying build but also the most robust option.

    Option 2 is to fill behind the trim without removing it (from the outside) with walltite insulation/airtight silicon - easier but perhaps not so long lasting.

    Would option 2 using walltite/silicon last the life of the house?
    Or should we bite the bullet and get the trim removed?

    Thanks for your help,

    Jiggins.


Comments

  • #2
    ht9zni1gs28crp
    Closed Accounts Posts: 1,011 ✭✭✭ht9zni1gs28crp


    The only way I can see is Option 1, which will provide a continuous seal between the frames. Whats the scenario like at the head and cill though?

    I wouldn't rely too heavily on airtight silicone. The corner window with steel post is a massive cold bridge anyway and it would be a shame to see it loosing air aswell...


  • #3
    jiggins
    Registered Users, Registered Users 2 Posts: 33 ✭jiggins


    Thanks miller.
    I wrapped the post in 10mm foil faced aerogel so thermal bridge is OK. Head and cill have walltite insulation affixed to the window frames and will be taped also - belt and braces there i think.
    I'll try to go with option 1.
    Thanks miller
    miller_63 wrote: »
    The only way I can see is Option 1, which will provide a continuous seal between the frames. Whats the scenario like at the head and cill though?

    I wouldn't rely too heavily on airtight silicone. The corner window with steel post is a massive cold bridge anyway and it would be a shame to see it loosing air aswell...


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