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Green Building Bible, Fourth Edition
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Housing - Renovation: UPVC window seals

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    • CommentAuthortony
    • CommentTimeFeb 21st 2021
     
    UPVC window seals

    We are finding an increasing number of problems with UPVC window seals. The predominant seals are rubber and these go brittle and loose their springiness allowing draughts to enter the building take a look and see if your curtains move when it is windy outside 😢

    In other cases seals and glazing rubber seals have shrunk back leaving gaps at the corners, this could be as a result of the original seals having been stretched into place rather than pressed into place. Alternatively the seals may be shrinking with age, UV exposure or the action of ozone in the air.

    Some budget windows omit the outer seal on the sash but generally have the grooves for them present. Replacement seals are readily available and if yours have failed for any of the above reasons they should be replaced. Please do this rather than replacing whole windows.

    My own windows are wood clad with insulated aluminium sections on the outside with two rubber seals and two foam filled nylon tube seals to each sash. If I had UPVC windows with rubber seals I would seriously consider using encapsulated foam seals.
    • CommentAuthorLF
    • CommentTimeFeb 22nd 2021
     
    Tony, Can you give and example of encapsulated foam seals. I searched and did not find. Upgrading seals seems a very good idea.
    I have had mixed results on replacing seals on 18 year old UPVC windows. The hollow circularish section ones seem to get flat after say 15 years and can need replacing. I bought a seal sample kit on ebay for rubber or epdm seals and got the right one to replace them.
    UPVC with its thermal expansion issues does seem a challenge.
    • CommentAuthortony
    • CommentTimeFeb 22nd 2021
     
  4.  
    Tony

    I have just fitted stormguard seals to the shop windows between the glass and retaining timber trims. Would the above seal be a better option?
    • CommentAuthortony
    • CommentTimeFeb 22nd 2021
     
    No.
    • CommentAuthorjms452
    • CommentTimeFeb 23rd 2021 edited
     
    Posted By: tonyIn other cases seals and glazing rubber seals have shrunk back leaving gaps at the corners,


    This happened with the uPVC windows we inherited. Massage the seals back into the corners and add a blob of superglue in the corner sticking the seals together. If they have shrunk a lot do alternate corners in pairs with a day in between. Voila

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