I am working in a bS Germany group where we define a MVD for model based quantity take off (for Architecture). We are working together with architects, construction companies, QTO engineers.
The goal is to define a kind of an mvdxml which contains a certain set of data at a dedicated planning stage.
We are designing this MVD based on the VDI norm which defines the degree of completion (Fertigstellungsgrad) for cost estimation. This goes from 100 up 500, whereas 300 is a finished design (Entwurf in german). We are currently working on 300.
Now after defining the needed properties we are in the mapping phase where we map the properties to the corresponding IFC properties.
And here we are coming to the point where it seems that the existing IFC properties are not sufficient.
In this design planing phase the architects need an additional description which belongs to a building element. This description contains additional information which will help the QTO engineer to calculate the price tag. We call this field “Einbauort” (in English “place of installation”). This is the location where the building element is placed. And this comes as an additional information to storey or room whoch are not enough.
Examples: Zone 3, or Section 2 etc.
This “place of installation” is a kind of additional information helping the QTO engineer understand the element. In the design phase the QTO engineers do not have the final information but need to understand as good as possible the design intension of the architect.
We have tried to find several properties in IFC but so far none of them seems to fit.