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[EMD]

Over hang canopy over the bedroom window leaking
again  Must be the 4th time me and farther tried to stop water coming in .
Seems like its getting in between the join between tiles adjoining both houses .
Is there a spray sealant for wet seeping in between felt 

[Mr Gav]

You need to cure the problem, not mask it with some sealant.

Everything on a roof should be over lapped to prevent water from coming in so there shouldn`t be a joint between the two houses unless there`s a height differential  and that`s where lead work comes in, which should then be dressed into the brickwork.

[EMD]

Our roof was re tiled but next doors has the original old tiles so it looks like there is a gutter or something to make them join together . Ive had someone take off 2 rows of tiles and they cant see any problem 

Kind of like this :

[Mr Gav]

If that weather strip has been properly fitted then it shouldn`t leak, it looks a bit like a valley only flat.

I wonder if the problem is nearer the ridge and the water is traveling down?

[Marks DTM Calib]

That is indeed the correct method for two joining roves but, there must be a fundamental problem, remember that the felt is the key weather proofing element of a roof and must be overlapped correctly including below one of those GRP fittings

[Diamond Black Geezer]

Yup. A 14th century thatched roof is actually full of 'holes' - but the angling and spacing of the reeds means that the waters simply runs downward and drips off.  As said, there's a fundamental issue which needs hunting out. Don't 'put P38 and paint over the rust' so to speak 

[EMD]

We found a few spits in the felt where its curved near the canopy , slapped some
felt repair paste on with patches for now 
Question is surely roof tiles are not 100% water tight so some rain will
get under then the felt diverts any excess away , no ?
If this repair don't work we Will have to get the roofers in .

[Marks DTM Calib]

Correct, the tiles provide a physical barrier and the felt a waterproofing layer.