What is clash detection?

A "clash" is the result of two elements in your design taking up the same space. In Building Information Modeling (BIM), clash detection is the technique of identifying if, where, or how two parts of the building interfere with one another.

What is a hard clash?

Hard clashes occur when two or more components are occupying the same space or are interfering with each other. For instance, in the image above an existing point cloud duct is routed through a new ductwork path.

What is a soft clash?

A soft clash indicates that an object has not been given sufficient geometric tolerances in the design phase or if its buffer zone has been violated. An example of a soft clash would be failing to leave sufficient space for maintenance workers to service an air conditioning unit. If the building design lacks sufficient space, it will trigger a soft clash.

What is a workflow clash?

While not an object clash, in BIM, a workflow clash results from inconsistent or conflicting building information. For example, an HVAC maintenance schedule that does not align with the scheduled delivery of spare parts.

Clash detection uses:

  • Assess structural integrity
  • Assess energy efficieny
  • Reduce instances of human error
  • Prevent expensive late-stage redesign
  • Plan efficient building operation
  • Ensure compliance with regulatory requirements
  • Ensure the master model satisfies safety and performance requirements
  • Clash detection between existing services and new services

Benefits of clash detection services:

SAVE TIME: Once clashes are identified, they can be reviewed and resolved before advancing to the construction process. It also results in easier sequencing and/or scheduling. MORE ACCURACY: Accurate estimates for the entire construction phase, leading to fewer accidents Reduced Risk: Fewer errors on all stages of a construction project. Smaller risks, lower overall costs, and drastically decreased material waste.

Why use it?

BIM clash detection has become one of the features that greatly improves modern construction project processes, especially when it comes to collaboration between different stakeholders. Clash detection is a much needed breath of fresh air for an industry that already has a lot of coordination responsibilities!