Understand what conflict detection is in BIM, how it works in practice, and why it alone does not guarantee the compatibility of your project.
O clash detection BIM It has become part of the vocabulary of those who work with projects in civil construction. But, in practice, there is still a very common misconception: that identifying conflicts between disciplines is the same as making the project compatible.
But it's not quite like that.
Many teams run the interference detection, generate the report, and move on with a sense of accomplishment.
But without a structured process behind it, these identified conflicts are rarely resolved in a coordinated manner, and the problem, which seemed resolved on screen, reappears.
In this article, you will understand what is clash detection BIM, What are the different types of conflict, the main software options on the market, and, most importantly, why this tool resolves fewer issues than it seems when not part of a well-structured process?.
Read also: How a data center project works: stages, challenges, and the role of BIM.
What is conflict detection in BIM?
Clash detection in BIM. It is the process of identifying interferences between elements from different disciplines in a project. within a virtual environment, before anything is executed in the work.
Imagine the plumbing of a standard floor being modeled at the same time as the structure and the air conditioning system.
Without automated verification, it's common for these elements to overlap or occupy the same space in the model, and no one notices this until the execution phase, when correcting it becomes more expensive.
This is the problem that clash detection seeks to anticipate.. By federating the models from each discipline into a single environment, the tool automatically scans the project for collisions, overlaps, and critical proximities, generating a report with the interferences found.
Types of conflict in BIM: understanding the levels of clash detection
In BIM, not every identified interference has the same degree of impact or urgency.
Clash detection tools classify conflicts into specific categories, and knowing each of them helps teams prioritize fixes, make faster decisions, and prevent minor problems from becoming obstacles to execution.
Here are the main types:
Hard Clash
It is the most evident and most critical conflict. It happens when Two distinct elements physically occupy the same space in the model., like a pipe running through the inside of a structural beam.
Because this type of interference represents a physical impossibility of execution, it requires mandatory resolution before the project can move forward.
Soft Clash
This occurs when the elements do not physically touch, but violate the space requirements necessary for installation, operation, or maintenance..
A pipe that runs too close to electrical equipment, without respecting the minimum safety distance, is a typical example. If ignored, a soft clash often leads to serious complications during the construction phase or during the use of the building.
Clearance Clash
It's a variation of the soft clash, with focus on the predefined slack zones around each element. The conflict is detected when a component encroaches on this reserved area, such as the space required to open a record or perform equipment maintenance.
It's a type of clash that is often underestimated, but it directly impacts the building's operation.
Workflow Clash
Unlike the previous ones, this type does not involve geometry. Workflow clash occurs when there is... Inconsistencies between information, timelines, or responsibilities in the BIM workflow., like two disciplines modeling the same design point with contradictory specifications.
It is the most difficult conflict to detect automatically and the one that most exposes process and communication failures between teams.
Clash detection software: which ones to use and when.
The choice of tool depends on the level of complexity of the project and how the disciplines are organized. In general, there are two main approaches:
Software dedicated to (multidisciplinary) compatibility.
Used when different teams work on different platforms and it is necessary to integrate everything into a single environment:
- Autodesk Navisworks: Widely used in medium and large-scale projects, it allows for federating models and organizing conflicts by priority;
- Solibri Model Checker: It goes beyond geometry, validating rules, standards, and model quality;
- Tekla BIMsight: free option, more common in startup teams or smaller projects;
- Trimble Connect: focused on cloud collaboration and integrated model management.
Read also: Does BIM require more work at the beginning? Understand what's really behind this perception.
It is the most difficult conflict to detect automatically and the one that most exposes process and communication failures between teams.
Clash detection software: which ones to use and when.
The choice of tool depends on the level of complexity of the project and how the disciplines are organized. In general, there are two main approaches:
Software dedicated to (multidisciplinary) compatibility.
Used when different teams work on different platforms and it is necessary to integrate everything into a single environment:
- Autodesk Navisworks: Widely used in medium and large-scale projects, it allows for federating models and organizing conflicts by priority;
- Solibri Model Checker: It goes beyond geometry, validating rules, standards, and model quality;
- Tekla BIMsight: free option, more common in startup teams or smaller projects;
- Trimble Connect: focused on cloud collaboration and integrated model management.
Read also: Does BIM require more work at the beginning? Understand what's really behind this perception.
Software with built-in detection (internal use)
Suitable for checks within the model itself, without integration between disciplines:
- Autodesk Revit;
- ArchiCAD.
These resources are useful for one-off validations, but they do not replace compatibility tools in multidisciplinary projects.
Why does rework persist even after clash detection?
This is probably the most honest question a team can ask after adopting clash detection. The report was generated, the conflicts were identified, and yet rework continues to appear on the project. What's missing?
The answer lies in what happens after the report, not in the tool itself.
The conflict was identified, but it wasn't truly resolved.
Identifying an interference and recording it in the report does not mean it has been resolved. In many workflows, conflicts are marked as "resolved" without the models of the disciplines involved being effectively updated.
The result is a clean report and a project that still carries the problem, only now it's invisible to those coordinating it.
There is no clear person responsible for the resolution.
When a conflict involves two or more disciplines, the question "who resolves this?" doesn't always have a clear answer.
Without a BIM Coordinator acting as a central point of coordination and without well-defined responsibilities among the teams, identified conflicts remain in limbo; everyone knows they exist, but no one takes responsibility for fixing them.
The process is reactive, not preventative.
Companies with less BIM maturity tend to use clash detection as a one-off step, usually at the end of a project phase.
More mature teams integrate conflict detection throughout the entire BIM workflow, with frequent rounds and clear approval criteria before moving on to the next phase. The difference isn't in the tool, it's in the process culture.
Lack of integration between disciplines
Clash detection exposes conflicts, but it doesn't solve the communication problem that caused them.
When architecture, structure, and installations work in silos, each discipline in its own model, with little exchange of information during development, conflicts are an inevitable consequence.
Solving them one by one without addressing the root cause is to work reactively in a never-ending cycle.
Clash detection is one of the most valuable tools in BIM coordination.
However, only when it is embedded in a structured process, With clear responsibilities, updated models, and integration between disciplines. Using it without this context is identifying the problem without addressing the root cause.
If your team already uses conflict detection tools and is still experiencing rework, the problem is probably not with the software. It's in the workflow and the BIM maturity of the team.
This is precisely where Cadbim comes in. Talk to our team. Discover how to structure your company's BIM coordination.