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The Importance of BIM Technology in Historic
Preservation
Joseph Hwangbo, CM-BIM, ART
Solution Specialist – Architecture w/ Microdesk
Representation of the Physical World…
Computer Laser Tape Measure
…is Always Going to be Partial
Examples of Representation
Personal Experience
• State Capitol Building – as built laser scan of interior and
exterior with BIM model at LOD 400
• Hearst Castle – as built laser scan of interior and exterior with BIM
model at LOD 500
Building Information Modeling
• Single Virtual Model
• Can be worked on Simultaneously
• Parametric Ability
• Database-based
The I in BIM = Information
The I in BIM = Information
The I in BIM = Information
The I in BIM = Information
Level of Detail/Development
LOD 100 LOD 200 LOD 300 LOD 400
LOD 100 – Conceptual Massing
LOD 200 – Approx. Geometry
LOD 400 – Fabrication
Relevance to Historic Preservervation
• Model communicates form of historic fabric
• Includes data to identify and inventorize
• Ability to Phase to represent multiple points
in the history & transformation of the building
• Record demolition affects during bldg. rehab
Questions to Ask
• To what extent will the existing conditions be
investigated and modeled to enable the
desired visualization and documentation?
• To what extent should existing conditions be
modeled in order to communicate how they
should be preserved or modified?
BIM 3D – 7D
Data
• The challenge of managing data
• The model can associate data with elements,
rooms, etc in a way that remains continuously
updated as modifications are made for new
design or to record as-built conditions
• Model can be queried for embedded data to
derive schedules & customized views
Example of Custom Views
Geometry
• In the past, composition of geometric views
independent of each other
• With BIM, the elements are demarcated and
interrelated
• Differing LOD’s for different purposes can coexist in
model
• Need for BIM Execution Plan
Example BEP
Layers
• BIM allows 3D assemblies of layers with
various properties assigned
Example of Wall Assembly
Form
• Computational advances of contemporary forms
in complex geometry and mathematical
patterning can be translated into BIM relating to
rehab and preservation
• Parametric tools help inform choices about new
construction that is sympathetic yet
differentiated from existing elements
Sequencing
• Phasing of data to enable the visualization
and tracking of changes of multiple phases
BIM Phasing & Sequencing
Collaboration
• Entire team can work simultaneously in the
same file
Case Studies
Video
Hearst Castle
Hearst Castle Entrance
Hearst Castle Fountain
Hearst Castle Fountain
Q&A
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