leaking roof (sort of)

camxg1977

I'm having  a devil of a job with water coming in through the ceiling of the first floor landing of my two storey house.  Three roofers have tried to unsuccessfully fix matters.  Unfortunately, water came into the house again yesterday.  As well as raining, whenever the water has come in, there have been squalls of wind and I anecdotally feel tboth rain and wind are required.  I'm at the end of my tether in trying to get to the bottom of matters, and am looking for input so as to constructively engage with the next roofer.  The water is coming in directly below where the pitched roof meets the wall of the dormer and this is where all the previous repair work has concentrated.  Is there any way water could move horizontally along the roof such that the weakness in the roof is not directly below the ceiling damage?  I know tiles can be lifted by wind?  Any other ideas?  I've also thinking the water might be being blown into the space above the ceiling through a weakness in the brickwork?  The house is only 10 years old and the brickwork does not look to be in bad repair.

theoretica

My parents had a leak where a sloped roof came off their wall - there should have been lead (I think it was) flashing set some way into the wall, but it had only been put in a tiny way so the water got round it somehow. 

10 years old - any neighbours built at the same time have the same roof arrangement?

camxg1977

To get to the bottom of the problem, am thinking of getting a surveyor to do some moisture mapping and thermal imaging.  Anyone have any experience of these approaches for diagnosing water ingress or am I throwing good money after bad?

stuart45

Some external and internal photos would help.