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Saturday, December 12, 2009

BIM Deliverables and Level of Detail : #BIM #AIA | BIM, the Built Environment and Stuff

We had a specialty contractor in our office yesterday learning how to make Revit families.  Part of the training was establishing guidelines of what exactly they need for their Revit models and what others would potentially need.  One of the things I saw at AU last week was that contractors are offering the completed models to the building owners for facilities management.  Some contractors have even created some specialized software that ties into Navisworks and can generate work orders and maintenance reports for building systems.  I'll give special kudos to David Epps of Holder Construction for his work and what his company has created. Here's the link to his class:   CR222-2 BIM for Contractors: Autodesk® Navisworks® From Design To Construction To FM.

As a specialty contractor, what exactly do they need for their shop drawings, coordination or facility management data?  Do you need a flat 2D box, extruded 3D AutoCAD box, AutoCAD MEP object or a Revit family?  What data do you need?  Is it eventually going to be shared with others who might need it for structural, MEP or energy analysis?  How much does the object weigh in real life?  Is there a URL link so it can be tied into a manufacturer's website spec sheet? 

Read below and look at the different levels of complexity that may be needed for content. Are you an architect laughing right now at what the subs have to go through?  Well, the same will be expected of you from the owners, so pay attention.  It's interesting to note that the contractors are providing these levels of detail to owner/operators/facility managers for the projects they are doing in BIM and they're winning more business because of it.  Why?  Because they offer a higher level of service to the owners for the life of the building and help facilitate the maintenance, operation and energy efficiency of those buildings. Welcome to the new world of BIM where it's all about the I and information.

Repost: http://frombulator.com/2009/12/bim-deliverables-and-level-of-detail-bim-aia/

The AIA issued a document last year E202 to try and put a wrapper around BIM development and the expected amount of detail needed with each deliverable. The first question most of us ask or should ask our clients is, ‘what do you need it for?’ Not to be facetious, like when my kids ask me for my car keys (they are 11,9, and 6) but what is the purpose of the model as it go from simple generic modeling for spatial planning/validation to a complete CD Set and fine tuning that scope and managing the deliverable is still more art than science.

To break it down quickly the AIA called out 3 Levels of Details, LOD 100, 200 and 300.
LOD 100 mostly to a model built for massing and it does not mention model elements.
LOD 200 is a model built with generic model elements. And dependent on the client and deliverable you may or may not give properties to these elements.
LOD 300 is a model built with specific assemblies to the model elements, so a wall is not generally seen as ‘generic wall’ but rather an assembly such as brick | furring| dry wall with their own properties and dimensions to make a whole and this can go on all the way through the model with all the element and again should be dependent on client needs.

For most purposes I am not sure where Level 100 comes in except in the conceptual stage and most of us are dealing with LOD 200 and LOD 300 Models. The way I like to approach it is everything is a LOD 200 Model, and then speak to the client and ask what the model is to be used for and which elements need to have details and which can be generic, they sign off and then everyone has a clear idea of scope and deliverable.

When we initially starting producing BIM models in ‘06 we usually made the mistake of over delivering by making custom window families for most of our projects, now with so many window libraries out there it’s pretty easy to find a facsimile and even though a 1760 Inn does not have new Andersen Double Hung Divided Light Windows but they worked fine based on the client needs which was for master planning, construction of a new building, and spatial validation.

Publick House BIM
Publick House BIM

BIM Deliverables and Level of Detail : #BIM #AIA | BIM, the Built Environment and Stuff


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