Architectural Flashing Supply
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BIM objects, metadata and model coordination · Lesson 2 of 4

BIM objects, metadata and model coordination: materials, standards and design constraints

The standards that name, grade and exchange model information, what each Level of Development requires and where flashing first appears, the properties and units a flashing object should state, and the states a model passes through.

You will be able to: Identify which standard says what about a model, read a Level of Development requirement for flashing, and list the information a fabricator needs on a flashing object.

12 min · 11 slides · 9 questions

All lessons in this module
Slide 1 of 11

The standards stack at a glance

ISO 16739-1:2024 defines the IFC data schema, ISO 19650-1:2018 sets concepts and principles for managing information, and the BIMForum LOD Specification, 2025 edition, describes levels of development.

COBie is a data format and process standard for managing and maintaining facility assets, defined as a Model View Definition of IFC.

Each answers a different question.

The BIM vocabulary and the standards behind itSix stacked boxes: model element, LOD Specification 2025; type and instance, Revit help and NBS guidance; property sets, IFC and ISO 16739-1:2024; classification, UniFormat, OmniClass and Uniclass; Level of Development, BIMForum LOD Specification; information container, ISO 19650-1:2018 and the UK BIM Framework Guidance Part C. Below, two AFS panels: AFS reads PDF, DWG, DXF, IFC, PNG, JPEG, WEBP and TIFF; AFS does not read Revit RVT or RFA, which are exported to IFC, DWG or PDF.BIM vocabulary and its standardsModel elementA wall, roof or coping with dataDefined in: LOD Specification 2025Type and instanceStored once per type or per copyDefined in: Revit help; NBS guidanceProperty setsNamed groups: Material, ColorDefined in: IFC, ISO 16739-1:2024ClassificationWhat kind of element it isDefined in: UniFormat, OmniClass, UniclassLevel of DevelopmentHow far to rely on the informationDefined in: BIMForum LOD SpecificationInformation containerIts state, status and revisionDefined in: ISO 19650-1, UK Part CWhat AFS reads from a model fileReadPDF, DWG, DXF, IFC,PNG, JPEG, WEBP,TIFFNot readRevit RVT, RFA:export to IFC,DWG or PDF

Six stacked boxes: model element, type and instance, property sets, classification, Level of Development and information container, each with the document that defines it; below, two AFS panels showing the file types AFS reads and the Revit files it asks to have exported.

The module at a glance: the words, the documents behind them, and what AFS reads. The sources are the BIMForum LOD Specification 2025, Autodesk help and NBS guidance, ISO 16739-1:2024, the UniFormat, OmniClass and Uniclass systems, ISO 19650-1:2018 with the UK BIM Framework Guidance Part C (states, status and revision), and the property-set wording from the ISO 16739-1 catalogue abstract; the AFS panels come from the upload format register.

Sources

Glossary

LOD 300
Level of Development 300: the element as designed, so its size, shape and location can be measured, but it is not guaranteed to be clash-free.
LOD 350
Level of Development 350: LOD 300 plus the interfaces with adjacent or dependent elements, meant to support construction-level coordination.
LOD 400
Level of Development 400: an element matching the level of shop drawings; a typical model holds very few.
LOD 500
Level of Development 500: geometry that comes from observing an existing item; it does not mean higher than LOD 400.
COBie
A data format and process standard for managing and maintaining facility assets, defined as a Model View Definition of IFC.
Model View Definition
A subset of the IFC definitions that one kind of exchange uses; software conforming to IFC names the Model View Definition it follows.
Information container
A named set of information, such as a model file, that moves through the work in progress, shared, published and archive states.
Status code
A code on an information container saying what it may be used for; in the UK annex S1 is suitable for coordination.