On most projects, several disciplines design their own systems at the same time: structure, architecture, mechanical, electrical and plumbing. Each can look correct on its own and still conflict with another. Clash detection is how those conflicts are found before they reach the site.

What clash detection is

Clash detection combines the models from different disciplines into one coordinated model and checks it for places where elements occupy the same space, or sit too close to work properly. A duct running through a beam is the classic example, but clearances and access zones can be checked too.

Why start early

A conflict found in the model is a conversation. A conflict found on site is rework. The earlier issues are raised, the more options the team has to resolve them, and the less disruption there is to fabrication and installation.

How the process usually works

• Collect the models and drawings from each discipline.
• Combine them and run the agreed checks.
• Group and prioritise the issues found, so the important ones are handled first.
• Issue clear documentation to the people who need to resolve each item.
• Track each issue until it is closed.

What makes a clash report useful

A report is only helpful if people can act on it. Each issue should say where it is, which elements are involved and what question needs answering, with enough information for the right person to respond. Raising conflicts and open questions early, with that level of detail, is what keeps coordination moving.

Read about our BIM Coordination & Clash Detection service, or contact us to talk about your project.