How to model internal walls which are adjacent to a roof space?

Insulated or uninsulated walls to roof space m2 should be entered in to the “Wall to Roof Space” field that is located in the ceiling details window (e.g. a zone with raked ceiling that has walls that adjoining the roof space or internal zones with significantly different ceiling heights created walls adjacent to the roof space).

Example 1 : walls adjacent to roof space created by raked ceilings

Example 2:  walls created by different internal zone heights

NOTE: be sure to check the proportion/m2 for each wall area external and wall to roof space