90% OF CLASH DETECTIONS ARE MISSED

90% OF CLASH DETECTIONS ARE MISSED

BIMCAD Journalist 29/04/2026

If you’ve ever sat through a project handover meeting and thought, “Didn’t we already check for clashes?” — you’re not alone.

Every year, companies invest heavily in advanced BIM tools that promise “clash-free” models. Yet once projects reach the construction site, reality often tells a different story. So, what’s going wrong?

The truth is that today’s BIM software does a great job detecting obvious geometric conflicts (hard clashes). However, BIM is not a “silver bullet.” Studies and real project reviews show that most teams still miss critical clashes — especially those that only become apparent during construction.

So, what sets the top teams apart?

They don’t rely on tools alone. Instead, they apply structured clash control processes, combine practical construction experience, and adopt a multidisciplinary coordination mindset right from the design stage.

Let’s take a closer look with BIMCAD Vietnam in the article below.

Clash detetecions (1).png

CLASH DETECTION IS NOT A SILVER BULLET


Tools like Navisworks or Solibri do a great job scanning for “hard” clashes — meaning physical overlaps between model elements. But most problems on site don’t come from obvious overlaps.

They come from subtle issues that the software can’t fully understand. For example:

  • A duct that technically clears a beam but leaves no space for insulation or future access.
  • A pipe run that looks fine in the model but breaks the code minimum clearances.
  • Two trades are working in the same zone at the same time, but the software has no way to check the installation sequence.

These are the blind spots that cause the real headaches.

WHY DO SO MANY CLASHES SLIP THROUGH?


We see a few common patterns again and again.

  • Models aren’t fully updated: When one subcontractor uses an outdated structural file while coordinating MEP, even the best clash test won’t help.
  • The clash test itself is too generic: Running a blanket “everything versus everything” test creates thousands of tiny irrelevant clashes. The real priorities get buried in the noise.
  • There’s no ownership: Many teams don’t have a clear plan for who is supposed to resolve which clashes or track them to closure.
  • Access and code checks get ignored: Most tools don’t flag minimum clearance zones or future maintenance pathways unless the team sets up extra checks.

These are the key reasons why clash detection may be performed — but problems still occur on site.

WHAT SMART TEAMS DO DIFFERENTLY


Here’s what the top teams do to catch what the software misses.

We break clash tests into smart, manageable sets 

Instead of dumping thousands of clashes into one massive report, we organise checks by system and discipline. Ductwork vs structure, sprinklers vs lights, electrical vs mechanical — this makes the results clearer and quicker to act on.

We don’t rely only on software 

No automated check replaces real-world experience. Our BIM coordinators walk through every space digitally, checking clearances, maintenance access, and installation paths that generic clash tests can’t catch.

We plan for how things will be built, not just how they fit 

A model might look fine when everything’s placed in position, but the real test is whether it can actually be installed step by step. We look at lift paths, the sequence of works, and make sure systems don’t block each other during construction.

We keep everyone working on up-to-date information 

Using cloud tools, our teams and partners always coordinate on the latest models, so no clash slips through because of an old file sitting on someone’s desktop.

We bring site feedback back into the model

Our teams work closely with people on site to catch issues early and feed real conditions back into the design. This way, every clash that slips through becomes a lesson for the next project — not just a patch-up job.

HOW TO ELIMINATE REAL-WORLD CLASHES


A zero-clash report means nothing if it doesn’t match reality. What matters is a site that runs smoothly because everyone trusts the coordination process.

The best teams don’t just rely on software. They build clear workflows, run smart tests, assign ownership, and create a culture where clashes aren’t hidden but solved before they turn into costly rework.

CONCLUSION


The real goal is not a “clash-free” report. What truly matters is a jobsite that runs smoothly, saves costs, and avoids last-minute issues.

If you want your next project to be well-coordinated from the start, connect with BIMCAD Vietnam. Our BIM Engineers have supported numerous projects, delivering models that are not only correct on paper but also work effectively in real-world construction.
 

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