IFC - What is it - Why is it important

After my last blog on 2016 – The Year of the UK BIM Mandate  

I have a had a number of questions about Open BIM and the IFC file format.  In this blog I want to try and explain a little about IFC. As this is a blog it is only a brief overview of a huge subject.

What is IFC

IFC is a file format that is independent from any one BIM authoring program such as Revit, Aecosym, ArchiCAD, Tekla etc. It stands for Industry Foundation classes. The format is developed by a non profit organisation called BuildingSmart .

Without getting too technical. It is an XML specification which is implemented by the software vendors into their software.  Some do it better than others which we will talk about later.

What’s different about IFC then other file exchange formats (dwg, Step etc). IFC  exports both

• Geometry

•  Information (Data behind the model)

An IFC file is a text file that describes all the graphics & data in themodel. If you export a file from your software you can open it in text editor and it will look similar to the screen shot below 

• 
  Don’t edit the IFC file in a text editor unless you really know what you are doing.
  
  
  There are different versions of IFC as shown below
• IFC4 (March 2013)
• ifcXML2x3 (June 2007)
• IFC2x3 (February 2006)
• ifcXML2 for IFC2x2 add1 (RC2)
• IFC2x2 Addendum 1 (July 2004)
• ifcXML2 for IFC2x2 (RC1)
• IFC 2x2
• IFC 2x Addendum 1
• ifcXML1 for IFC2x and IFC2x Addendum 1
• IFC 2x
• IFC 2.0
• IFC 1.5.1
• IFC 1.5
•  

Why is IFC important

IFC is very important because a BIM project cannot be done in one software. We need a way of exchanging graphics & data from one software to another.

The information in a model is often forgotten about but is essential to the success of the BIM process. It may not be important for your clash detection but it is important to other members of the BIM team such as the contractor, QS, FM manager and others.

Majority of BIM authoring software’s support IFC. IFC is constantly under development and constantly improving so you have to ensure you are using the latest update of your software’s IFC importer/exporter.

 

For example if you are using Revit you can download the latest version of IFC from the Autodesk apps exchange store. https://apps.autodesk.com/en

This IFC export update also gives you an alternative interface to the standard Revit IFC interface.

Are there issues exporting to IFC

IFC is only as good as the software that exports it and the software that imports it. What I mean by this is that IFC is only a specification. Each software company will implement IFC differently to suit the objects in their software. Some better then others.

For example in previous versions of Revit, Wall profiles didn’t export very well. Autodesk have improved their implementation of IFC over the last few versions and now the wall profiles export correctly.

Don’t round trip your IFC exports. Don’t export out of one program such as Revit and then import it back into Revit again.

Every IFC exported object is given an IfcGUID. This is a global unique identifier assigned to every object. This IfcGUID will live with the object so each time it is exported the object will always have the same IfcGUID unless you delete the object and redraw another object in it’s same place.

How do I know if it is an export or an import problem?

I often use a program called XBim http://www.xbim.net/ XBim is an independent IFC viewer. If it looks ok in XBim then it’s not an export problem it’s most probably an import problem.

Conclusion

If you are using IFC on your project ensure that the IFC guidelines are clearly laid out in the BIM execution plan. Ensure everybody is using the same version.

 You may encounter problems using IFC between different programs. But there is nothing new about that. There has always been issues going between different programs. When you encounter problems exporting/importing find out where the problem is and address it by learning more about IFC and find a workaround.

We will be running regular BIM courses throughout Ireland & the UK throughout 2016. Please contact us at info@siscin.ie for further details

If you have any questions on anything in this blog or any other blog please feel free to contact me at dan@siscin.ie.

Dan Deery is the managing director of Siscín. Dan has over 20 years in the construction industry and has been using BIM since the mid 90’s. He also worked as a programmer for a CAD software company. Siscín  specialise in BIM Consultancy. Training,visualisation and animation for the Infrastructure, Engineering, Construction, Facilities and Architectural industries. Check out our Website www.siscin.ie

2016 – The year of the UK BIM Mandate

Happy New year all. It’s 2016 and a big year for the construction industry. The UK government BIM mandate comes into effect.

A lot of companies are ready for the BIM mandate there are still a lot of companies that have not made the jump to BIM for various reasons. In this blog I will try to explain it in plain english.  The UK BIM mandate will have a knock on effect not just in Britain but also on surrounding countries such as Ireland.  

 As part of our training and consultancy I am out working with companies across Ireland and the UK. I hear many reasons why companies have moved to BIM, but I also hear many reasons why companies are not moving to BIM. Some of the reasons I have heard are,

·         It’s too expensive

·         doesn’t affect me

·         I’m too busy

·         just ignoring it

·         I don’t do government work

My answer to all of the above are.

·         It will be too expensive not to

·         It affects everybody in the construction industry

·         You won’t be busy for much longer if you don’t

·         Ignore it if you want but you won’t be in business long if you move to BIM

·         The mandate refers to government projects but private clients are now requiring BIM on   
            projects.

What is the BIM Mandate

The BIM mandate is designed to accelerate the use of BIM in the construction industry. The BIM process must be used in the design and construction of a government projects. This will enable the government to reduce costs of between 15 – 20% . It promotes lean and offsite construction cutting down on waste.

The BIM mandate says that projects should be done in an open BIM format. This means that the project can be done in any BIM software or software's but should be delivered in a file format called IFC (Industry Foundation classes) which is an independent and open format.

BIM Process

BIM is a collaborative process, where multiple disciplines or companies work together and create a single model known as a federated or central model. You can find out more about collaborative BIM by reading our blog on collaborative BIM http://siscin3d.blogspot.ie/2014/05/its-good-to-share.html

The change to BIM for businesses

Many companies think that BIM is about changing the software they use. BIM is not just a software change, BIM is a process. Just because you buy BIM software and send a couple of members of staff on a BIM software course it does not make you BIM ready or compliant.  BIM is a culture change is needed within a company because BIM is a method of delivering a project and managing a building through it’s lifecycle. BIM needs to be implemented from the top down.  For more information, see our previous blog on implementing BIM.

http://siscin3d.blogspot.ie/2014/06/bim-from-top-down.html

 BIM Process

A successful BIM project needs to be planned. But by good planning you will have a successful project .  See our blog on the requirements for a successful BIM project.

http://siscin3d.blogspot.ie/2015/09/requirments-for-successful-bim-project.html

The BIM process does not end with the construction of a building. The BIM process lives on through the life of the building with the Facilities Management team. See our blog on BIM for building owners and facilities managers

http://siscin3d.blogspot.ie/2015/10/bim-for-building-owners-and-facilities.html

We will be running regular courses throughout Ireland & the UK throughout 2016. Please contact us at info@siscin.ie for further details

If you have any questions on anything in this blog or any other blog please feel free to contact me at dan@siscin.ie.

Dan Deery is the managing director of Siscín. Dan has over 20 years in the construction industry and has been using BIM since the mid 90’s. He also worked as a programmer for a CAD software company. Siscín  specialise in BIM Consultany. training & visualisation and animation for the Infrastructure, Engineering, Construction, Facilities and Architectural industries. Check out our Website www.siscin.ie