When modeling Residential Projects, you are required to include a Floor, 4 walls and a Ceiling/Roof. This zone has no Ceiling/Roof.
You can either add an Exterior Roof to the zone, or you can add an Interior Surface, that is selected as a Roof (Not a FLOOR). Your third option is to put in an Interior Surface in the space above, selected as a Floor, and marked as Adjacent to this Zone.
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