Whistling windows - can't find source

Joined
28 Dec 2011
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Location
Glasgow
Country
United Kingdom
Hi,

Over the winter our bedroom window started whistling in the wind. I've tried in vain to find the source of the problem, so any advice for things to try would be appreciated.

Here's what I've tried so far that hasn't solved the issue:

- draught excluder around the windows
- sealing any small gaps between the window interior and the wall where the caulk had split
- sealing any gaps between the window exterior and fascia
- sealing around the window interior with duct tape (!)

I've noticed that even with the window open a little, or pressing against the window frame, the noise persists and doesn't change intensity or pitch, which suggests to me that it's not wind whistling through the window itself.

I also noticed the noise was quite loud and clear when I pressed my ear against the fascia where I've marked with a red arrow one of the images. The fascia has a little bit of give when I pushed it, which I fixed by screwing it down more, but that didn't fix it either. I can't see any more obvious gaps around the fascia, at least without someone (not me!) climbing out onto the roof to search for the issue.

My next thought is to remove the interior PVC strip that covers where the window meets the wall, fill any gaps, reattach and reseal (green arrow in the other image). Then, failing that, do the same on the exterior.

Any other suggestions would be great. As you can imaging, this is doing my head in!
PXL_20260225_081648543.jpg


PXL_20260226_162219211.jpg
 

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