I have a gable garage that runs into a taller section of the house. From the attic area above the garage facing the taller part of the house the wall of the higher portion shows as an exterior wall, so I see brick where I would expect a framed wall. Shouldn't the interior part of the attic show an interior wall, and change to show brick on the exterior portion when split by a roof plane? I can change the wall to an interior wall, but then the exterior part changes from brick to an interior wall.. I tried splitting the wall, but it still leaves brick on part of the interior wall. Is this as designed, or is there a way to get the interior wall of attic to show as an interior wall, while the exterior shows as an exterior wall?