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Best way to seal UPVC window sill back to the brickwall

https://forums.diydoctor.org.uk/viewtopic.php?f=188&t=52622

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Best way to seal UPVC window sill back to the brickwall

Posted: Mon Nov 01, 2021 8:41 pm
by SiG01
Just moved into our new house then the window sills at the front need a bit of TLC as you can see from the photo the sealant has come away from the bay window. this has happened on both sides and on both the bottom and top windows.

Just wanted to see if there was something better to do other than cutting the old sealant out and reapplying fresh sealant?

Re: Best way to seal UPVC window sill back to the brickwall

Posted: Thu Nov 04, 2021 9:48 pm
by stoneyboy
Hi sig01,
There is clearly a lot of movement between your frame and the wall. Suggest you find a building silicone with the lowest modulus which will give you the best chance of sealing the end grain of the sill.
Regards S
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