Semidetached house with gabled roof

In my area, there are multiple old houses with two halves that have separate house numbers, but with a single gabled roof:

From what I read, creating two separate polygons and tagging them with “building=semidetached_house”, plus the house number / address information, seems to be correct.

However, when tagging both halves with “roof=gabled”, the result is a zig-zag-shape with two separate roofs. (Unfortunately as a new user I cannot put a second picture in here, Discourse won’t let me.)

What would be the way to go: A single “building=detached”, with two address nodes? A single “building=semidetached_house” polygon, although it includes both halves? Or is there a way to tag a roof as “one half of a gabled roof”?

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