Curtain wall
Glasfasad
A glazed facade system resolved at system level — its mullions and panels are not stand-alone walls.
Walls category as a curtain wall type, with Curtain Panels and Curtain Wall Mullions as sub-elements
IfcCurtainWall typed by IfcCurtainWallType, with IfcPlate and IfcMember components
walls
Facade area (m²) at system level; mullion length (m) and panel count where a recipe states them
Where this element is normally designated in each Swedish reference system. Code values stay with their publishers.
| System | Designated in | What it establishes |
|---|---|---|
| CoClass | Functional systems (enclosing), then Constructive systems for the facade system | Designated as a facade system; the panels and mullions are its components. |
| BIP | Object designation for the facade system plus performance property designations | Keeps the system readable as one thing rather than hundreds of fragments. |
| BK04 | Group and article — profiles, glazing units, gaskets | Supply grouping at component level, after the system requirement exists. |
Identity → classification at system level → contract → recipe. Mullions and panels are excluded from ordinary wall classification before it runs.
- Counting mullions and panels as walls inflates wall area dramatically; LITHIC excludes them from the wall population by evidence, not by name.
- A facade system's performance is tested as an assembly, not as a sum of its parts.
BIM data is evidence, not authority
A parameter in a model is a claim made by whoever typed it. Treating claims as authority is how wrong numbers get inherited across an entire project.
Decision receipts: proving why a construction choice was made
A receipt is not a report. It is the reconstructable record of one decision: its scope, its evidence, the rules applied, and the exact versions in force.