Water getting inside my window

Craggy Man · 26-03-2026 01:15PM #1

Hello … has anybody had a similar problem to mine here?

I would just love to know how to fix this!

I have dampness getting in along the inner edge of a window as shown in the pics

Its the only place that water is getting in. The house is 26 years old and must be happening since day one!

If there is strong wind driving rain towards that window, you can see water running down along the inside of the window

There is obviously water leaking in through the cavity. There is no obvious gap in the stone outside (i have checked).

Im tempted to get the local window supplier guy to remove the window to check out that cavity

Wonder if the window could be installed incorrectly?? Any ideas would be appreciated

Id love to solve it!!

Photo15713.jpg

Photo15712.jpg

muffler · 26-03-2026 03:18PM

That doesn't look good at all. Most likely it's a problem with the dpc but the only way to be sure is to remove the window.

Craggy Man · 26-03-2026 04:10PM

https://www.boards.ie/discussion/comment/124342366#Comment_124342366

Thanks for your reply, thats interesting you mentioned DPC. Im getting a local window installer to look at it next week. If the window was removed, would it then be very obvious to see if the DPC is the issue?

10-10-20 · 26-03-2026 04:22PM

Given the position of the moisture at the top of the reveal, I'd be thinking that it's the DPC on the lintel specifically.

It's not usually possible to see the lintel DPC unless the external stone face is removed, but it's not that unusual to have to rework it by pulling the bricks/blocks/stone, but your would be challenging given the lay of the blocks.

https://www.housebuild.com/documents/1528/lintels

muffler · 26-03-2026 05:48PM

https://www.boards.ie/discussion/comment/124342516#Comment_124342516

If the issue is at the top of the vertical dpc then it's a little easier mended but as 10-10-20 said above it could well be (and probably is) the dpc at lintel level then it's a bit trickier. You could apply some sealer around the window edge but you would be masking the main problem which will reappear at a later date. Get the window out and see where the problem lies.

tabby aspreme · 26-03-2026 06:21PM

Take a close look at the mortar joints over the window and the stone, for cracks, looks like limestone which is porus, I've seen a chimney built with limestone which had to be plastered to stop it leaking

Water getting inside my window

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