Ok thanks - was torn as it seems lazy but then a long guttering pipe going along the top of the roof would look rubbish!
It would also allow all sorts of shit to build up around it. You want your roof surface clear so it can shed water and debris as quickly and efficiently as possible.
And the pitch would restrict the flow and make it more likely to block.
@Howard started
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Ok thanks - was torn as it seems lazy but then a long guttering pipe going along the top of the roof would look rubbish!