Trapped water under felt

Joined
5 Mar 2008
Messages
102
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4
Location
Norfolk
Country
United Kingdom
Hi all.....

I have a porch with nothing under it (if that makes sense) the roof is felted and the underside clad in UPVC. I got on the roof at the weekend as I wanted to check the seals around the window above. On getting on the roof I noticed that the left.most section in the picture below was slightly raised and made a sloshing noise when I stood on it. This only affected the first strip which is the lowest point of the roof. Today I took off a panel of UPVC and carefully drilled a hole in the middle of the first strip from below. A good four litres of clear water came out. I didn't pierce the roofing felt.

The roof is 14 years old and the underside of the OSB is dry. While stepping on the affected felt I couldn't see any water escaping. Where is this water coming from?

Also, can this be fixed by heating the affected strip with a roofing torch? I have access to one which my father has in his garage.

Any help appreciated
 

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A few pics from above will be more helpful showing the flashings around the edges and where the water was.
 

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