How do I bathroom / kitchen / extension? etc.

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Howard in reply to @Lw.

would you expect the rain water to dump out of the downpipe onto the new lower roof

This is fine

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Lw. in reply to @Howard

Ok thanks - was torn as it seems lazy but then a long guttering pipe going along the top of the roof would look rubbish!

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Howard in reply to @Lw.

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.

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