BIM objects, metadata and model coordination
What a BIM object carries, how Level of Development, metadata, classification and the information standards describe it, how AFS reads a model of a flashing, and the checks that catch wrong classes, units, levels and revisions before metal is cut.
4 lessons · about 46 min · 11 diagrams · 0 videos
Version 1.0.0
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Lesson 1 · 10 min · 10 slides · 8 questions
BIM objects, metadata and model coordination: principles and terminology
What a building model element is, how type and instance data, property sets, metadata and classification describe it, what AFS reads from a model file, and why model data never replaces a check before fabrication.
You will be able to: Name what a BIM object is, separate its geometry from its information, and say what a fabricator can and cannot expect to find in a model of a flashing.
Not startedStart →Lesson 2 · 12 min · 11 slides · 9 questions
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.
Not startedStart →Lesson 3 · 13 min · 12 slides · 9 questions
BIM objects, metadata and model coordination: methods and worked application
A seven-step method from a received model to a checked job packet, worked through on a 186 ft coping run: units and piece counts, the coping girth against AFS limits, dimension ownership, clash and clearance checks, and the question to ask when two numbers disagree.
You will be able to: Apply a seven-step method to a model of a parapet coping: identify the file, read the unit and properties, attribute each dimension, check AFS limits, run a clearance check, raise questions and record the packet.
Not startedStart →Lesson 4 · 11 min · 11 slides · 7 questions
BIM objects, metadata and model coordination: defects, verification and case study
Seven recurring model-data defects with the evidence for each, a receiving checklist, a constructed case study of a 186 ft coping run that arrives as an IFC, and the situations in which to stop and ask.
You will be able to: Diagnose seven plausible model-data defects, state the evidence that proves each one and the correction, and apply the checks to a constructed case study.
Not startedStart →
Practical task
Take one model or drawing of a coping or flashing run (an IFC, DWG, DXF or PDF, or the AFS teaching file your instructor gives you) through the seven-step method and prepare a job packet that another person could check without asking you anything.
Hand in
- The file format named, with how you know (its contents, not its extension), and, for a Revit file, the export you asked for.
- The length unit stated, with every conversion shown at 25.4 mm per inch and one number checked against a dimension you already know.
- A list of the elements and property sets read, with every material, gauge, finish or color the model does not state recorded as "not specified".
- Each dimension tied to the element that owns it, with any building dimension marked as not a flashing dimension.
- The piece count at the 10 ft standard section and at the 126 in maximum, and the girth checked against the 48 in limit, each with the arithmetic written out.
- A list of open questions (two numbers that disagree, a missing cleat, hem or legs) and the model status and revision, so the packet is dated and attributable.
Rubric
| Criterion | Meets the standard when |
|---|---|
| File and unit | The format is identified from the file itself, an unreadable or Revit file has the right export named, and the unit is read from the file and converted at exactly 25.4. |
| Elements and properties | The elements and property sets are listed as the model states them, and every unstated item is recorded as "not specified" rather than guessed. |
| Dimension ownership | Every dimension is tied to its owner and no wall or other building dimension is used as a flashing leg, width or height. |
| Limits and counts | The piece counts and the girth check are correct, show the arithmetic, and label the 10 ft standard and the 126 in maximum separately. |
| Coordination and status | Disagreeing numbers become written questions that say where each number lives, and the model status and revision are recorded before any quote or cut. |