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Seal under flashing?

Discussion in 'Windows and Doors' started by avendit, 19 Dec 2019.

  1. avendit

    avendit

    Joined:
    11 Apr 2013
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    Location:
    Edinburgh
    Country:
    United Kingdom
    Hi,

    A couple of years ago I had a couple of windows replaced and I noticed the windows both have incredibly cold window sills. I had a look on the outside and there are a couple of obvious gaps in the exterior sill that I can easily mastic up which will hopefully help a bit.

    Under the sill tho is a led flashing which seems to have pretty big gaps - above in one case, under in the other. Am I OK to fill these with sealant?

    Bathroom for context and showing 1 area which is easily fixed:
    bath1.jpg
    But under that flashing is this:
    bath2.jpg
    which certainly explains the condensation on the tiles inside.

    Second window on our stairs. The flashing in this case comes out onto a 15 degree roof:
    stair1.jpg
    This one is a bit different in that the gap is above the flashing this time:
    stair2.jpg
    This one isn't quite so cold, but still pretty bad.

    So question - can I just seal all these up with a mix of foam and exterior sealant? Or is that going to block important waterways or ventilation?

    Thanks in advance,
    Avendit.
     
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  3. avendit

    avendit

    Joined:
    11 Apr 2013
    Messages:
    2
    Thanks Received:
    0
    Location:
    Edinburgh
    Country:
    United Kingdom
    Well, I've filled all the gaps and everything has got much warmer. Now to see if everything rots and fall apart :-\
     
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