Leaking valleys down the side of dorma window

[powertoolmad_Jim]

Hi,
I have a leak down one side of a dorma window in the attic bedroom. I recently replaced the plaster and lathes with plasterboard but couldn't see anything wrong from underneath. I have also been on the roof and inspected, there was some debris in the valley but moving this hasn't cured the problem. The lead in the valley looks sound but it seems to be leaking from near the top. I have a few options to solve this:

1) get a roofer in
pros:hard to find good trustworthy roofer, expensive
cons:if done correctly will be a proper job
2) cover the valley over with flashing tape
pros:unsightly, unsure about longevity
cons:cheaper, can DIY it

I'm in a terrace house and alot of the other dorma's have flashing tape covering the valleys which is why I am thinking about it. normally I would have a proper job done but lack of funds, baby on the way and the fact that I've just decorated the bedroom and need to get it fixed before any prolonged rain comes.

Any advise would be most welcome
Thanks
Jim

 

[masona]

Any photo?

 

[powertoolmad_Jim]

sorry for bad photo's as the roof is still wet and I can't get on it

this is mine

this is next door with flashing tape

 

[masona]

Your next door neighbour flashing is only for short term solution although you may get away with it but could do long term damaged to the roof section if not known, you really need a professional roofer because removing slate tiles is not easy and it might not even be where you think the leak is It could be coming from your flat roof or the flashing on top of the flat roof etc.

As for getting a good roofer, you could try your local BCO planning for recommendation

 

[powertoolmad_Jim]

Thanks masona. I think I'm gonna have to get a proper roofer in.
What is the bco? All I keep finding is british council for offices

 

[masona]

Building Control Office at your local planning dept

 

[powertoolmad_Jim]

I've had a good look at the roof now and it looks like the water is coming in from the top were he gutter ends

looks like I cut the guter a bit too short when I replaced it earlier in the year

I am thinking I can patch this up with some lead flashing and it will then be good.
What is the best way to do it? should I take the gutter off and put the lead behind that a bit and under the other soaker and over the tile? should I put a liner between the gutter and the wooden strut?

Thanks for any comments
Jim

 

[masona]

You may get away with replacing the missing tiles and re-run the gutter longer with 2 stop ends bracket and a small downpipe keeping the water away form the area on the corner, you will gain the extra gutter length when putting in the downpipe