This option allows you to add or remove inner volumes from your model.
Inner volumes are used to take account of the thickness of walls, ceilings and floors. The thickness of the walls will be defined later in the Apache Constructions Database. The thickness of the wall is represented in the model by a grey line which is offset into the room by the thickness of the wall. Inner volumes are only suitable for use in models with relatively simple geometry. Note that when using the option of inner volume, the area associated to the thickness of the walls will not be accounted for as part of the area of the room in question. Inner volumes will then give the Net area of the building rooms, whereas no inner volume will give in aggregate the GFA of the building; according to the value desired by the user, this can be of importance to take in account before starting the construction of the model.
