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Dear friends, Today I poured buckets of water over the flat bay roof and gave it a good soaking to see if any would leak through and none did. I suspect it is to do with the flashing/cavity wall - not quite sure. Please take a look at a range of photos of the problem at...

A close-up of the worst part.

I'm told this looks in reasonable nick. It is taken from the upper window down onto the roof.

This is the underneath of the flat bay roof following the leak which is in the far-right corner.

L view

R view

Does this window prevent water from coming down the 'cavity' into the bay roof?

Front of house and the guilty flat roof in question. Note the British Bond brickwork.

Is it possible for water to enter at the roof of the house (even though the attic and roof is dry) and run down between the bricks (even though there is a window on the upper floor) or is it more likely that water gets in where the front bay joins the house (where the flashing is quite shoddy...

Thanks. I will post some pics probably at the weekend! There is single brick between the house and the next-door property (shared wall), the side of the house is 'British Bond' and I assumed there were cavity walls elsewhere? Is this unlikely for Victorian era?

Hello, Another leaking bay roof! The downstairs bay window has a felt roof and when it rains heavily, the water is dripping constantly and fills a bucket within a few hours. Above the bay window is nothing except sky though on the next floor up is a window that is flush with the cavity wall of...