How do I model an attic, including dormer windows and internal walls to roof space?

If the other side of an occupied attic is a normal roof space then treat the wall as outside with the approximate properties of the roof. This would include adding additional insulation to walls if this is present in the roof construction.

Model the zone/s on the top level as having external walls of a small height and a raked ceiling except where the dormer windows are in higher external walls.

NOTE: if there is no vertical external wall height in the attic zones make the external wall 100mm high, but be sure to model the ceiling as raked

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