In article ,
Ian Jackson wrote:
Actually, I'm just in the process of having a small house extension
built. The flashing (where the new lean-to roof meets the old wall) is
lead. Should I be worried?

It's the only material which does that job properly, so no.

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*According to my calculations, the problem doesn't exist.

Dave Plowman London SW
To e-mail, change noise into sound.