BIM

So what is BIM?

Building Information Modelling (BIM) is not new; it’s been around for over 30 years. The term relates to a process. It is often misunderstood simply as 3D CAD modelling but, while BIM does require software that is capable of 3D modelling, it is the ‘I’ of BIM, the information contained within the model, that is key to it. BIM enhances the collaboration of designers working on the same 3D model, from which all project documentation and data is extracted. It represents the first truly global digital construction technology and – again, contrary to popular belief – it is possible, indeed desirable, regardless of project type and size.

BIM can be utilised from the concept design phase all the way through to construction. Even after project completion, a project’s BIM model can be used for asset management throughout the lifetime of the building.

What are the key benefits?

BIM initially benefits designers. Designing holistically ensures better collaborative working and, with it, better accuracy and reliability of design information, with the risk of human error substantially reduced.

Other advantages include;

• measurable models provide early cost certainty

• better/earlier compliance checking

• elimination or mitigation of project risks and ultimately delivery costs and timescales.

Why is non-BIM practice inefficient?

Traditionally, different activities during the design process are separated, each consultant working independently on different drawings. As such, project-wide communication and co-ordination can be inefficient.

Here’s why: consultants are working on separate 2D drawings or use a 3D model that is not related to the 2D drawings. Every time a change occurs, each separate drawing and the model need to be updated separately, including schedules and visuals. The chance of errors and element clashes is high in this ‘old school’ environment, but surprisingly remains common in many practices.

How does BIM work differently?

BIM produces a coordinated output based on a central 3D model. When changes are made in the central model, they are reflected in every output (views, drawings, and schedules). All the required data derives from a single source, which means better integration between the different branches of design and specialists.

All BIM software uses a common “language”, allowing consultants to use different software platforms. It works with design tools that look and act like real construction elements, e.g. walls, door, windows etc. It also enables the integration of real objects based on manufacturers’ actual construction details.

The fact that these elements have real and accurate physical properties makes everyone’s job easier. The designers can detect mistakes and clashes, the clients have a more accurate understanding of what will be built, and the contractor has confidence in the accuracy, reliability and coordination of the design information. Information can be populated into schedules and many of these processes can be automated, reducing the possibility of errors.

A new workflow

The model is developed within the same software from conceptual design through to the final design phase and after. As the design process goes on and the model evolves, it becomes possible to create:

• Massing studies

• Façade studies

• Light studies

• Design development

• Value engineering exercises

• CGI renders and movies

• Planning and technical documentation

• Details

• Schedules

• 3D fly-throughs for the client to sign-off

The whole team can work on the same model, even with colleagues who are based in different parts of the world.

The information model can be presented and even shared to clients and other members easily via BIMx – an application for tablets and smart-phones. This allows them to see the proposal in 3D before it is built and provides them with sections, plans and schedules, all from the same file.

Further BIM benefits

In a BIM project we can differentiate between existing elements, new elements, and those to be demolished. This feature is crucial in a refurbishment project, where Lees Associates have unrivalled experience. With the BIM model we can even simulate construction and identify possible issues on site before the project even starts. Quantities can be extracted from the model that link directly to other software (typically working with cost management, known as ‘5D solutions’).

Once construction is finished, facility managers can use the virtual model for handling and retrieving information, collaborating with architects and contractors for the lifetime of the building. A virtual building interface can be set up that links to mobile devices, thus allowing active maintenance and even automated servicing.

If you are interested in the potential of BIM for your project or practice, feel free to contact our studio for a chat about the future.