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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cjr in reply to @Howard

I disagree, ours does that and in torrential rain, it creates a waterfall effect in front of the french windows. Also creates a tide mark on the rooflight that is slightly in the flow of the water.

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Howard in reply to @cjr

Sounds like shitty implementation tbh

If you want done 100% (and you can’t take it over the side of the house as you are in a terrace) it means taking the water through the roof, the room below and in to a subsurface drain.

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