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As I understand it this is a reference to barns not their roof shape although it too is in the Oxford English Dictionary a farm building comprising a curved roof set on an open frame, used to cover hay.dutch barn
This is a dual pitched roof, a roof having a shallower slope above a steeper one on each side, its in the Oxford English Dictionary as such.Gambrel roof
Not just the building regs but the British Standards too, with the best will in the world I cannot see how you could call that a dual pitched roof, its a pitched roof with a flat roof on top.Build regs define a flat roof as any roof up to 10 degrees pitch.
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