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Many thanks for your reply, would a raised kerb option be more susceptible to rainflow and thermal bridging issues compared to a 150mm+ parapet, or is it designed completely differently to avoid such issues? I’ve heard a lot of horror stories with architects/ designers not taking such issues...

Hi all, I'm planning on having a flat roof extension (5x3m) with a parapet style walls but stuck on height requirements for the parapet wall. I'd like to have the parapet style walls with either stone or metal coping to avoid having plastic trims/ visible gutter pipes/etc. but I'm having...