Remodels in Revit... the untold story

To my surprise, there's not a whole lot of discussion on this very important topic. Anyone who has developed a custom remodel residential project can tell you it's not as simple, clean, or intuitive as a custom new construction residential project.

The first step is pretty staight forward... build your as-built model in the existing phase. Once an as-built model is done you might want to archive a copy of the model just incase the design scope changes and you have to start all over again with a clean as-built. Now I'm sure you are all aware that as the design develops the project architect and the client are both going to want to explore varying design iterations. The model builder is going to have to do partial demolition of walls, floors, roofs, ceilings, etc. The way most Revit Beginners go about doing this is to split the wall, floor, roof, etc into two parts and demo the half they want to remove. The problem with this method starts to reveal itself after 2-3 design iterations when the as-built model, now split into many parts, degenerates into useless plans and elevations. Constantly reshaping the proposed design on the fly without time consuming cleanups also becomes less possible.

So what do you do with partial demos? You could create a new phase between Existing and New Construction called "Existing To Remain." Then copy the element to be demo'd to the clipboard... then demo the whole element in the "Existing to Remain" phase... paste the element (into the same place) back into the "Existing to Remain" phase and then reshape the existing to remain version of our element (Some users think that a demo phase is not necessary, but it has it's benefits). Now anytime the design goes through iterations all you have to do is reshape the existing to remain element while leaving the as-built model preserved and intact.

Plans require additional cleanup, but this approach reduces the frequency and types of cleanups required, particularly obvious when you move on to elevations and sections.

EDIT: Partial additions can be done the same way you would do partial demos... copy, demo, paste, reshape. If you just add on to the length of a wall you're going to end up with a proposed design that's in pieces too. This can be important later on down the line when you want to combine phases into a new asbuilt. However, getting accurate Material Takeoffs on a remodel can add a dimension to this procedure (you might want a model that's divided into accurate pieces afterall).

EDIT: This process works with or without a demo phase.  The critical point is to group and pin previous phase work before proceeding with the next phase and then copy, demo, paste, reshape in the next phase... with plan cleanup in demo and proposed plans by regions and element overrides. Most beginners only think in terms of existing and proposed. This process considers multi-phase projects.

Demons In Your Data?

The more you work with Revit the more likely you are to run into demons in the data. What do I mean by demons? Demons are unexplained behaviors. I'm not talking about software bugs that won't go away until you've installed a software update. I'm talking about errors in the data of the project file itself. Errors that can be repaired by replacing the corrupt data with an arbitrary value and then changing it back again.

Somehow, the process of changing the offending data to something arbitrary, then changing it back to the way it should be can remedy unexplained behaviors. I'm not talking about changing a value and then hitting the undo command. I'm talking about using Revit's tools to change the data to something arbitrary then changing it back... like the change is some new data for the model. It's just a matter of isolating the parameter values that are causing the unexplained behaviors... then finding the right combination of commands that will reset or refresh the offending data. These commands might include flexing parameters, cut & paste in same place, mirror, nudging, or possibly other commands. Let me give you some examples...

I upgraded a model once, from Revit 2009 to Revit 2011, and an odd thing happened. In hidden line mode, half the doors and windows had shaded glass (by design) while the other half had no shading. And it wasn't like there was any consistency... the shading was gone from random doors and windows. I realized at that point that I had a demon in my data, so I went into the offending material (glass) and set the surface pattern of the glass material to none (it was the surface pattern that was not cooperating), then changed the surface pattern back to solid fill to get this glass material to show properly everywhere.

Another thing that happens a lot... I like to nest families into a host family and link the parameters of the nested family and its host family, but once in a while after making a change to a nested family and loading it back into the host family, solids disappear or just don't flex when the family is loaded into a project. I have to flex some of the linked parameters, while still in the family editor, to reset or refresh the offending data.

Wall cleanups at intersections (not to beat a dead horse) can also cause demons. Sometimes nudging one of the walls can cleanup your intersection. Sometimes you have to cut a wall to your clipboard and paste it back into the same place to get intersections to heal properly. In fact, when any family (that was working fine before) isn't cooperating try a cut and paste in same place. This can reset data in the model.

If any of my readers are familiar with a particular demon please feel free to leave a comment describing the demon and how you "exorcised" it.

Editable Worksets and Workset Ownership

Here is a tip for beginners working with Worksets for the first time.

Let's say you have a project with worksets enabled and the whole model is on Workset 1 by default. If you right click on an element that is on Workset 1 and select the option that reads "Make Worksets Editable" you are making yourself the Owner of Workset 1. No one else is going to be able to edit ANY modeled elements that are on that workset. They can add elements to Workset 1 but they can't edit elements already placed.

If you go to Collaboration... Worksets... and you see yourself as the Owner of any workset you're probably locking everyone else out of that workset so make sure you click on the "Non Editable" button to relenquish the user-created Workset... or do a save to central and relenquish user-created worksets so other users can work on the model too.

What you more likely want to do is borrow... or select the "Make Elements Editable" option instead so you are only borrowing a small part of the worksets rather than Owning the whole workset.

Just a heads up for you beginners out there.

BIMtionary

Brandon Pike has started a new blog called BIMtionary. His posts include tiers of BIM Implementation and a Revit Implementation Checklist. I look forward to his future posts.

AEC EDGE Magazine

AUGI has published their first quarterly AEC EDGE Magazine. This has been reported on several blogs already but I really enjoyed it so I thought I'd post too.

Excerpt from a Revit Standards Manual

Some time ago I finished writing a 35 page Revit Standards Manual for our office. Since this is a blog for Revit Beginners I thought I would share an excerpt...

"One thing to keep in mind when implementing Revit for the first time. The more you rely on Revit's advanced features the more training your staff will require to use those features. Flexing families will require training, advanced scheduling will require training, developing clean condocs will require training... and so on. When you can, you should keep it simple. The difficulty is that, if your office is like ours, users will often demand things from Revit that requires the use of more advanced features. Hence more training becomes necessary. And, as people come and go, you will find out that even basic training never really ends."

Journal of Building Information Modeling

Read what some of the industry experts have to say about BIM in the relatively new Journal of Building Information Modeling.

My Work

It occured to me that I never once posted pictures of any project I worked on, so here are two images from a model I built back in Revit 4.5

Revit News & Resources

The UK Revit Users group is hosting a Revit Design Awards 2007 but you have to work in the UK to enter.

For those of you familiar with Content Highway or other Family File managers there is a new program being exhibited at this years AIA Convention in San Antonio, Texas. It's called techtonic and includes many very attractive features. TechtonicStudio also has a library of 100,000 commercial interior finishes for those of you who do a lot of photorealistic rendering and could use a new source of material maps.

Sometimes visitors to my blog ask me how they can print the blog for future reference. If you have a PDF writer like PDFCreator, CutePDF, or PDF Factory you should be able to print the webpage to PDF.

Some thoughts on Revit

Some people have to be reminded that the project file is a database and like any database the more and accurate information about the project you put into the model the more analytical modeling and scheduling you can get out of the model.

Building highly parametric families that flex can be just as tedious as software programming if you're not familiar with the "programming language" or in this case the many rules and shortcuts for family file creation. The family editor is in essence a "graphical" programming environment. Being more visual, this is probably the perfect programming enviroment for architects. As a rule of thumb the more automation you want to build into family or project files the more skilled your users have to be to modify these files later. Not everyone in the office needs to understand the rules of family file creation to use these families, but they would need some expertise to open these family files and make significant modifications. I know the same is true for many BIM applications.

Autodesk publishes basic usage of the tools in Revit, but there are many clever things an office can do by mixing and matching different tools and parameter values to get the project file to analyze the database and report and illustrate the information you need (and some information you didn't know you needed).

More Evolution News - IES

On the Sustainable Design front:

Revit BIM platform now linked directly to IES’s building analysis software

IES Virtual Enviroment software is a collection of building performance analysis tools that integrate with Revit.

The Data Manager

With the implementation of Revit we, like many offices, have had to assign people to develop Revit standards and content that is specific to our office. Some people refer to these individuals as Data Managers or Data Leaders.

In an Architectural Record article "Getting on Board with Building Information Modeling" Larry Flynn describes a Data Manager as someone "responsible for coordinating the various computer files and models that are integrated into a BIM."

HOK's CAD Standards describe a Data Leader as someone "responsible for the execution of the CAD strategy including, the use of BIM, the folder structure and file-naming strategy, use of templates, and documenting specific project procedures..." AND "... audits the drawings to ensure conformance with the standards and a logical organization of the CAD work."

In our office Data Managers are starting to inspect models for proper construction. And not just our models but also the drawings we are getting from consultants. They are virtually becoming in-house building inspectors or should I say... They are becoming in-house Virtual Building Inspectors.

To quote Daphne, one of our Project Managers, "Revit is becoming quite the little tattle-tail."

Evolution News

Take a look around and you'll find that Revit model data is being exported to other applications for many uses. And with the continued development of the Revit API more bi-directional interaction between Revit and other applications is becoming possible. Here is a short list of uses for which Revit model data is being exported. You'll find links to a few of the applications on my blog but there are getting to be too many options to keep up with.

Architectural Programming
Project Management
Construction Management
Consultant Coordination
Clash Detection
Enviromental Simulations
Performance Analysis
Cost Estimating and Material Takeoffs
Rendering, Animation, and other Presentation
Facilities Management and Building Lifecycle
Energy Analyisis and Green Building Design
Code Analysis
Specification Writing
Rapid Model Prototyping
CNC Fabrication

In short, architects are learning to Design, Illustrate, Manage, Analyze, Report, Simulate, Fabricate, Communicate, Estimate, and Educate smarter with Building Information Modeling.

The next things we might see:
ADA and Ergonomical Design Analysis
Security Analysis
Feng Shui Analysis