Brief definition
In an attic with sloping ceilings, only parts of rooms count as living or usable area where specific height and geometry conditions are met. The slope itself must be distinguished precisely from the usable area below.
Practical relevance
Incorrect manual take-off in attics is common. Clean geometric determination from drawings reduces disputes in living-area certificates and early design.
Normraum relevance
From the floor plan, Normraum supplies the floor area per room with confidence score and source reference. Inclusion by clear height (§ 4 WoFlV) needs a section or a survey – a floor plan alone carries no heights, and Normraum does not invent any. The check log records on which basis each area was calculated, so that the height-based inclusion builds cleanly on it.