Velux Problem

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I wonder if someone advise me where to start looking for a problem with a velux window leak (see attached photo). I started noticing the staining over the winter period, as seen the stain is on the bottom right hand corner of the ceiling. Thank you in advance.

Suffolkman
20210704_094915.jpg
 
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Plenty of photos of the outside are required, repost in the roofing section. What's the pitch?
 
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Thank you for your reply, I will do that. The pitch..not sure. It has been ok for the last eleven years. There is another next to it which is fine.

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Thank you for your reply. As advised earlier I am going to get up on the roof and take some photos of the exterior. Could you expand on your answer please ? Are the drainage channels at top and bottom of the window ?
 
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Without maintenance the side channels and back gutter can get blocked with leaves / moss which impedes the water drainage .
 
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