The ventilated cladding of exterior walls, including thermal insulation and connections, ensures that the basic building physics requirements for meeting the energy certificate, including summer and winter heat and moisture protection, are met. Due to the pronounced system and functional separation and the generally small construction mass, the construction method is characterized by high C02-eq and circularity efficiency. The method is suitable as a sustainable construction method for both renovations and new buildings.

The following applies to the rear-ventilated cladding of external walls (vertically mounted and rear-ventilated boundary of the building envelope): externally positioned and rear-ventilated cladding of external walls, including thermal insulation and interfaces with connecting components such as glazing, roof edges, flooring surfaces or supporting structure elements.

The main layers consist of supporting structure elements such as columns, joists, walls (shell construction, or mounting base for facade anchoring), substructure, insulation layer and exterior cladding. Each of the layers fulfills defined functions such as weather protection, thermal insulation, airtightness, load transfer, etc. and must be coordinated holistically. The minimum performance requirements are the fulfillment of the energy certificate including summer and winter heat and moisture protection. The performance requirements can be supplemented on a project-specific basis, for example with fire protection requirements, etc.

The multi-layer structure should be assigned information for the project planning and as a basis for the tendering as a complete component “rear-ventilated cladding of external walls”. This information usually includes the phase-specific technical specifications and the geometric information with a low level of detail (LOG 200-300) for generating the quantity takeoffs (cost estimate / cost projection).

The use case defines a collaboration between architecture and facade planning (ARCH synergy model) that focuses on synergies. The facade planning is assigned to the architecture with regard to the BIM processing. The facade engineering services are assigned to the architectural facade BIM model by means of specifications or attributes. Thus, the use case primarily defines the collaboration and the requirements for the ARCH model and explicitly the requirements for the statements to be generated from the model.

Minimal specifications or typical attributes are:

• Definition of component groups and construction types (basis for the BIM-generated bill of materials for cost estimate / cost projection and bill of quantities)
• Specifications of U-values, line allowances, etc. (basis for energy certificates and assessment of thermal comfort)

Geometrically, the ARCH model, with a targeted low LOG, is based on the architectural planning and the technical details or layer plans developed by the facade engineering.