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    How much silicon should be used around the edge of a new upvc window?

    Window Specialists

    I hired a window fitter to replace my living room window. He's replaced the window but when he was installing it I felt like he used a lot of white silicon before he covered it with a cover. How much sealant would be too much? Also he used white sealant with a brown frame? Am i wrong in thinking he could have colour matched? Thanks.

    Asked by MRS DAKIRI on 31st Mar 2020
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    Best Answer

    Gary William

    "Silicone should always be colour matched. Silicone should be used sparingly and only a small neat bead should be run where necessary and seen. If he covered the silicone with a cover strip and it cannot be seen that is no problem."

    Answered on 31st Mar 2020 - Member since Feb 2020 - report
    APL Roofing Windows and Doors

    "Yes he should colour match. Company's do use brown on a white by using masking tape round the edges. For a 1200x1200 just 1 tube should cover this."

    Answered on 31st Mar 2020 - Member since Jan 2020 - report
    A Class of Glass

    "He should have used about a tube if the window was the correct size when fitting. If used more the window must have been the wrong size so in that case you should use expanding foam."

    Answered on 31st Mar 2020 - Member since Jan 2020 - report
    M.F.P Warm Roofs and Conservatories

    "Just a nice thin bead to seal the window, should be nice and tidy."

    Answered on 31st Mar 2020 - Member since Jan 2020 - report
    HP BUILDING & GARDEN DESIGN

    "It seems that at the survey this was mis measured and left you with a shorter window.
    Normally there will be a trim added to hide this or a knock on section to make it up .
    The gap should be no more than 12mm."

    Answered on 31st Mar 2020 - Member since Mar 2020 - report
    Door Centre North East

    "If the new window frame had gaps around after installation the correct method would have been to foam fill all round to keep the best insulation property. Then a small D mould/trim and then a nice tidy silicone joint between the uPVC trim and the wall.
    We normally use no more than 1 tube of sealant per window, size depending.
    Yes a brown sealant should have been used around the window.

    Regards Eddie Wood."

    Answered on 31st Mar 2020 - Member since Mar 2020 - report
    Willis glassworks

    "The outside should off had foam in the gaps and then sealed up."

    Answered on 31st Mar 2020 - Member since Jan 2014 - report
    MB frames

    "It doesn't sound like your window fitter did the best job from what you have said. But normally Once the window is screwed level into place you would foam all voids around the window to insulate, Then silicone and trim the window with matching materials to stop water ingress. If you have any other questions please look me up.
    Mark
    MB Frames"

    Answered on 9th Apr 2020 - Member since Dec 2019 - report
    Sw Trades

    "It seems to me that maybe the window had been measured too small, the gaps around frame and stonework usually are filled using expanding foam and if there is scribing pieces ( covers ) these would be then fitted to cover the filled gaps. The silicone should have been colour matched or at very worst case a clear silicone should have been used to further seal the window. Hope this helps."

    Answered on 31st Mar 2020 - Member since Mar 2015 - report
    Solent windows

    "There isn't really such thing as to much silicon but as it's used to weather seal the window and trim. Personally I use clear silicon as it looks the neatest. Brown can be used but is more expensive and looks messy."

    Answered on 31st Mar 2020 - Member since Feb 2019 - report
    Thermal Save

    "Sounds like it was mis-measured. Only occasionally would you need to use a lot of silicone or expanding foam when the opening isn't square."

    Answered on 31st Mar 2020 - Member since Sep 2019 - report
    CGR Glazing & Roofing

    "Can you see the white silicone? Its a process called back filling its the right thing to do if you're using internal trims. Personally i would re plaster or fill the gap."

    Answered on 1st Apr 2020 - Member since Mar 2020 - report

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