BIMForum LOD Specification Jim Bedrick, FAIA // AEC Process Engineering Jan Reinhardt // Adept Project Delivery

AGC/AIA BIMForum LOD Specification 2

Specifying Deliverables 3 The Model Development Spec (MDS)

How can the Owner get the BIM(s) it wants? How can the Owner evaluate BIM deliverables? How does the model author know it is meeting its deliverables? How much information needs to be in a model? How much effort will it take (how do I price it?) Who’s going to rely on it for what? Problems 4

Paper vs. BIM Precision 5

Paper vs. BIM  Visual cues about state of development  BIMs often carry unintended information 6

Problem : Trust in the Model The Disclaimer: This model looks great so you can look at it but ….you can’t use it for anything or rely on it for anything ….which includes, but is not limited to, everything. If you use it for anything anyway ….then you have to pay my lawyers anything they want if I get sued… for anything related to your use of the model for anything. Have a nice day. 7

Response? Disclaimer Approach: Some of it’s not reliable so don’t rely on any of it. Specified-Use Approach: Some of it’s not reliable so only rely on  what I say you can,  for the purposes I say you can,  to the degree of precision I say you can. 8

Model Progression Spec Level of Detail 9

Model Development Spec Level of Development 10

A/E/C Process Engineering Copyright © AEC Process Engineering 2014 American Institute of Architects (AIA) 11 o LOD 100 – Conceptual “The Model Element may be graphically represented in the Model with a symbol or other generic representation, but does not satisfy the requirements for LOD 200. Information related to the Model Element (i.e. cost per square foot, tonnage of HVAC, etc.) can be derived from other Model Elements.” o LOD 200 – Generic Placeholders “The Model Element is graphically represented within the Model as a generic system, object, or assembly with approximate quantities, size, shape, location, and orientation. Non-graphic information may also be attached to the Model Element.” o LOD 300 – Specific Assemblies “The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of quantity, size, shape, location, and orientation. Non-graphic information may also be attached to the Model element.” o LOD 350 – Hybrid of Specific & Detailed Assemblies “The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of size, shape, location, orientation and interfaces with other building systems. Non-graphic information may also be attached to the Model Element.” o LOD 400 – Detailed Assemblies “The Model Element is graphically represented within the Model as a specific system, object or assembly in terms of size, shape, location, quantity, and orientation with detailing, fabrication assembly, and installation information. Non-graphic information may also be attached to the Model Element.” o LOD 500 – As-Built “The Model Element is a field-verified representation in terms of size, shape, location, quantity, and orientation. Non-graphic information may also be attached to the Model Elements.” from “AIA G Building Information Modeling Protocol Form”

A/E/C Process Engineering Copyright © AEC Process Engineering 2014 Steel Braced Frame $20-26 /sf → LOD 100 Conceptual → LOD 200 Generic Placeholders → LOD 300 Specific Assemblies → LOD 400 Details LOD Definitions 12

Level of Detail Looks like specific steel shapes Location can be measured precisely Level of Development Have the shapes been engineered? Are they in the final locations? Level of Development vs. Level of Detail 13

LOD Definitions  LOD

LOD Definitions  LOD

LOD Definitions  LOD

AGC/AIA BIMForum LOD Specification 17 Bimforum.org/lod

Clarifications  LOD does not equate to a design phase  There’s no such thing as an LOD ### model 18

Adoption Software Implementations 19

Adoption VA BIM Guide 20

Parameters in models The “I” in BIM  Up until now LOD Spec only deals with geometry  We want to capture and convey information using models  => Attributes associated with geometrical elements  What constitutes INFORMATION?  Needs to be defined by the project 21

Parameters in models The “I” in BIM  Objective:  A) Define: What is required, and  B) Define: What is NOT required  Reliable definition enables:  Methodical and automated checking of models  Reliable models  Computational methods 22

Parameters in models The “I” in BIM  Challenge:  Infinite number of attribute  See Revit, IFC, Bentley, VA BIM guide etc.  Populating the model with information requires definition  Which attributes are relevant?  LOD Specification Part A: defines required geometry  LOD Specification Part B: defines required attributes 23

LOD Master Table  Here is how it works 24 UniformatLOD Level

Breakout table A,B - Concrete 25

Breakout table A,B - Concrete 26

Breakout table D30 - HVAC 27 USE CASES

Breakout table D30 - HVAC 28

Breakout table D30 - HVAC 29

Parameters in models The “I” in BIM  LOD Specification Part B:  Use cases:  Quantity Take Off  Tracking of LEED items  Management of product information  Etc. 30

Parameters in models The “I” in BIM  Limitations:  LOD Spec Part B does not:  Deal with attributes that can be derived from geometry 31

32

Parameters in models The “I” in BIM  Next Steps  Nov 15: release of LOD Part B for Review  Dec 5: deadline for comments back to LOD  Dec 31: Release of LOD Part B. 33