Modeling guideline

Modeling guidelines define the framework and conditions for creating models. They include standards and best practices for organizing and managing digital models of buildings or infrastructures. Their goal is to ensure that BIM-models are consistent, interoperable and understandable for all project participants.

These guidelines take into account various aspects such as geometric accuracy, object parameters, uniform classification systems, file formats and exchange standards, and the Level of Development (LOD) for different project phases. In addition, they contain instructions on BIM coordination, naming conventions, structuring of files and objects, versioning and change management, data security and data protection, as well as training and provision of training resources for project stakeholders.

In the BAP - BIM execution plan, the company-specific modeling guidelines must be consolidated into a project-specific set. It may be necessary to make adjustments to the model creation and further processing in the companies involved to ensure that the guidelines are implemented effectively.

1. Geometry quality of the Building models:

The modeling guideline defines how elements are to be designed in the model. For example, how foundations, footings or external wall connections should be modeled. For example, rising components - such as columns and walls - are to be modeled floor by floor in order to be able to use the information further if necessary to simulate the construction process from the model.

It defines where certain reference points are located in the model, e.g. the position of 0.00 for the floors (top edge of the finished floor OKFF or top edge of the rough ceiling OKRD) or the unchangeable fixed point of the Coordination Body, for the model transfer between the different disciplines.

Depending on the selected Level of Geometry some model elements, such as walls, ceilings and roofs, must be represented in their individual layers. There are various technical modeling methods for this, which are laid down in a modeling guideline.

Every architecture and planning office that uses digital planning tools and works in a future-proof manner using the (manufacturer and software-neutral) OpenBIM-method develops individual modeling guidelines. These are adapted to the company's own internal processes and optimized for the exchange of information with external partners. It is therefore advisable to only specify basic requirements in the modeling guidelines.