Sealant to use around UPVC Double Glazing (Exterior)

Discussion in 'OT (OFF Topic) Forums' started by KillerHERTZ, Jan 25, 2015.

  1. KillerHERTZ

    KillerHERTZ Administrator Staff Member

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    My flat currently has some very old UPVC double glazing, when its windy I can hear a whistling coming from the windows. After looking outside I can see that on 3 sides of the windows the sealant between the window frame and the brickwork is cracking, and half of it has already come away.

    As a short term fix, what would be the best sealant to fill the gaps in until I can get replacement windows?

    Thanks!
     
  2. brucemillar

    brucemillar MB Club Veteran

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    Expanding foam. I believe you can get one for UPVC windows.

    Sent from my iPhone using MBClub UK
     
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  3. Howard

    Howard MB Club Veteran

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    How big is the gap ?

    If it's not too big ( smaller than 5mm ) you should be able to use some glazing silicone. Such as Everbuild 335.

    General Sealants | Toolstation
     
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  4. Slinkee

    Slinkee Member

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    The wrong expanding foam I believe can bow the window, meaning you maybe worse off. I believe expanding foam for upvc has a lower force on expansion.

    :)
     
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  5. Piff

    Piff Hardcore MB Enthusiast

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    If it is just sealant around the frame rather than big gaps, you need low modulus silicone

    edit
    fill any big gaps first.
     
    Last edited: Jan 25, 2015
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  6. Red C220

    Red C220 Hardcore MB Enthusiast

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    s500colin Hardcore MB Enthusiast

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  8. OP
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    KillerHERTZ

    KillerHERTZ Administrator Staff Member

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    Thanks for all the replies, can't use expanding foam as its only around a 1cm gap + it will make a visible mess. Will look through other options tho :)
     
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  9. MicB

    MicB Hardcore MB Enthusiast

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    Mic
     
  10. Piff

    Piff Hardcore MB Enthusiast

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    If it is a 1cm gap, I would cover the gap with a 2cm wide upvc trim, stuck on to the frame with Stelmax 1961, which you could then use to seal around the trim where it abuts the brickwork.
    Alternatively you could use solvent weld to stick the trim on then a low modulus mastic to point up.
     

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