For the construction of a storey, you can adhere to the following scheme. It shows the dependencies of the different structures to each other. From this you can deduce the order of the individual steps.
The area defines the outer frame for the multiple rooms with common properties on the same storey. It is a necessary condition to fulfil before defining the roof and rooms. You can neglect the definition of an area if you only need to define individual rooms.
Rooms are the most important structural unit in the building model. For the , the definition of only those rooms will suffice.
To use you need to define the complete building model.
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The roof is a prerequisite for the construction of outdoor installations (e.g. external lightning protection and PV systems).
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