just a hypothetical as it's only for a virtual house I'm making, but what do you do on the high side of a chimney that goes through a roof but not at the peak? ( see picture. )
As far as the roof carcass is concerned it is a case of forming a horizontal timber tray with a moderate falls to the exits, plus a short lay-board up the pitch of the roof also.
As stated regards the lead, a back gutter is the final installation of the flashing wrap-around.
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