BIM Clash Detection: A Quick Guide 

what is bim clash detection

Clash detection is one of the most critical steps teams can take to identify and mitigate potential design conflicts before breaking ground, thus preempting construction issues and rework. 

Clash detection has been around for some time. And while you can technically carry out the process manually—i.e., by reviewing details in design drawings or using a light box overlay —the advent of BIM tools has made the process easier and more accurate.  

That's why BIM clash detection has now become the standard in commercial construction, and it's implemented in a project's earliest design and preconstruction stages.  

In this guide, we'll explore the ins and outs of BIM clash detection. We'll shed light on the best practices and top tools you can use to avoid construction clashes and elevate overall project quality. 

What is BIM clash detection? 

BIM clash detection is a process that identifies and addresses conflicts among at least two construction models in a virtual environment. These conflicts, or "clashes," arise when different design components, such as structural elements, HVAC systems, or electrical conduits, intersect or interfere with the buffer zone of another object. 

Architects, MEP engineers, and structural engineers often independently create models during the design process. As such, when these separate models are aggregated into a single project model, there's a risk that the individual components would inadvertently overlap or interfere with each other. 

BIM clash detection highlights these clashes early in the preconstruction or design process, which helps prevent costly adjustments and delays during the construction phase.  

BIM clash detection determines where design aspects may overlap and creates constructability issues so teams can resolve them before moving to the next stage.  

What is automatic clash detection?  

Automatic clash detection can be implemented in one of two ways. First, a more manual version of automatic clash detection is when a BIM expert sets up a series of tests using several conditions, and the process is repeated for every new version. 

Another way of approaching automatic clash detection removes the initial setup process and the need for specialized expertise. This second method works by simply adding relevant models into a cloud-based file where they’ll be aggregated and clashed automatically. Since this method clashes everything together at once, BIM experts and non-BIM experts alike can then use filters and groupings to narrow in on items they're interested in. The resulting benefit is an immediate clash result and accessibility to all team members, regardless of their level of expertise or role. This immediacy makes it possible to pick up clash information directly in the authoring tools. So once a design decision is made, architects and engineers can see the impact of the change in real-time.  

What are the benefits of BIM clash detection? 

Harnessing the power of BIM clash detection comes with several advantages that can revolutionize how your construction projects are managed. Consider the following.  

Save time and money 

Since clashes can be identified and resolved before work onsite gets started, project teams save time and money by staving off the costly impacts of wasted materials, labor, and reworking physical properties. Teams can confidently move forward into the construction phase instead of worrying about what a new setback tomorrow might bring.  

Beyond this, BIM clash detection reduces the stress and logistical complications of last-minute changes, allowing the project team to focus on delivering positive project outcomes for their clients and their partners.  

Outcomes like jobsite safety. By reducing the risk of unexpected issues, on-site incidents are mitigated, and project leaders can manage their teams with safety at the forefront.  

Minimize risk and waste 

In addition to mitigating budget and schedule overruns, clash detection can improve productivity through smarter scheduling, material waste reduction, and installation efficiency.  

As project stakeholders eliminate potential issues early on, project managers have the insights they need to drive toward timely delivery and exceed client expectations.  

BIM clash detection can also minimize material waste. It allows teams to be more precise with their project planning, so they can order and utilize materials more efficiently and eliminate waste.  

Enhanced collaboration 

Projects undoubtedly see better outcomes when teams work together seamlessly. BIM clash detection paves the way for enhanced collaboration between different disciplines (architecture, structural engineering, MEP, etc.).  

When clashes are identified, all relevant parties must work together to resolve them, ultimately promoting better coordination across stakeholders.  

Types of clashes 

Optimizing BIM clash detection involves familiarizing yourself with the various clashes that can occur in a construction project. Let's break them down below. 

Hard clash 

A hard clash occurs when two systems and components take up the same place or intersect.  

For example, a structural beam might be positioned where an HVAC duct is intended to go, or a plumbing pipe might be designed to run through an electrical conduit. These are physical conflicts in the design that, if not corrected before construction, could lead to significant rework. 

That said, hard clashes are the easiest to identify—though they're incredibly costly if you miss them.  

Soft clash 

A soft clash (sometimes called a clearance clash) occurs when a building element or component has not been given enough space or buffer to operate effectively and safely. This might involve maintenance access, safety clearances, or operational spaces.  

One example could be if the AC unit doesn't have enough buffer space to be serviced by a professional. This could hinder routine maintenance and lead to extended downtimes, affecting the building's comfort and efficiency. 

Similarly, safety issues like a high-voltage wire being too close to a plumbing line could constitute a soft clash. Any leakage from the pipe could lead to an electrical short circuit or, worse, pose an electrocution risk to maintenance personnel. 

While soft clashes don't involve physical overlaps, they still pose significant challenges that could compromise the building's safety, functionality, and maintainability. Fortunately, these issues are flagged early on with the right BIM clash detection tools, so you can resolve them before hitting the jobsite.  

Workflow clash 

A workflow clash, known as a 4D clash, involves a scheduling conflict or project management misalignment. For instance, if the installation of electrical conduits is scheduled at the same time as pouring a concrete slab in the same area, it could result in work stoppage, rework, and delays. 

Or, if large equipment is delivered to the site before the area is ready for installation, it could lead to space constraints or damage to the equipment. 

Workflow clashes can hinder jobsite productivity when they're not caught on time. As such, identifying and addressing them through BIM paves the way for optimal scheduling and sequencing.  

How BIM clash detection is evolving 

While BIM clash detection has undoubtedly been a game changer for construction pros, there's still room for improvement, particularly regarding clash management. 

Today, BIM managers do a lot of pre-coordination meeting work, getting the whole project team to discuss and resolve issues. However, many of these meetings often focus on low-impact matters—e.g., fixing simple clashes and double-checking that previous issues were resolved.  

And while this level of granularity is necessary, teams need to develop a hybrid approach to clash management—one that involves continuous model coordination between engineers, architects, and trades.  

Accomplishing this requires a shift in mindset and practices. It means getting the entire team involved in clash detection and ensuring they collaborate throughout the week to find, prevent and fix design conflicts and misalignment. 

When issues are resolved on an ongoing basis, meetings can focus on high-priority issues, freeing BIM managers to devote their expertise to resolving more significant challenges. This optimizes everyone's time and encourages a more proactive, collaborative, and efficient approach to BIM clash management.  

All to say that a streamlined approach to clash management allows you to uncover the full potential of BIM technology, so you and your teams can further drive project success. 

Top clash detection software 

Speaking of streamlining BIM clash management, the best way to unlock efficiencies in your processes is to leverage clash detection software—ideally, one that's cloud-based. 

The right tools automate repetitive tasks, reduce the set-up time to near zero, and work with the tools people use daily. That way, teams can spend less time manually searching for conflicts and devote more energy to resolving clashes.   

To that end, here's a look at the top clash detection software for your construction projects.  

Navisworks 

Navisworks is one of the most powerful tools in the market for coordinating construction projects. With its advanced clash detection capabilities and quantification tools, Navisworks helps users ensure that models are ready for construction.  

On the scheduling and budgeting side, Navisworks' 4D and 5D simulation lets you animate and interact with objects and create schedules directly from models. You can also import schedules and cost items from third-party project management applications to ensure the smooth coordination of all project components.  

Beyond just detecting clashes, it also allows teams to validate and collaborate on proposed resolutions in a shared environment. 

Autodesk BIM Collaborate 

Coordinate teams and models from one place using Autodesk BIM Collaborate. The software enables project members to upload models, detect clashes, and resolve issues in real time. Enjoy unlimited projects and file storage, and rest easy knowing that all your info is secure and accessible. 

And with mobile-friendly tools, stakeholders can view models from anywhere, so decisions can be made sooner rather than later.  

Navisworks + Autodesk BIM Collaborate = a match made in construction heaven 

Navisworks and Autodesk BIM Collaborate are powerful tools that work even better when used together.  

Combined, these solutions massively benefit multiple teams and stakeholders throughout the project lifecycle. 

Let's start with BIM Managers. BIM Managers can use the Navisworks Coordination Issue Add-In to monitor the status, responsibility, and resolution of every issue across multiple projects. And since files are saved in the cloud, users in Navisworks can work on those files simultaneously, fostering real-time collaboration and promoting a seamless workflow from clash detection to resolution. 

On the VDC side, teams can decide where to carry out clash detection for a specific project or phase.  

Autodesk BIM Collaborate also lets users deactivate clash detection in certain coordination spaces. This feature offers rapid access to complex files in Navisworks while ensuring stakeholders can use essential workflows like Issue Management and Model Aggregation online. 

Moreover, BIM Managers can create custom views in Autodesk BIM Collaborate, which means they can develop views for individual objects, disciplines, categories, or types from multiple models. This gives VDC teams more control over project information, so they can deliver only the most critical construction data to stakeholders in the field and across other companies. 

In Autodesk BIM Collaborate and Navisworks, clashes can be organized into groups, enabling users to quickly review and generate batch issues from these grouped clashes. These groups serve as templates for clashes that share similar attributes, empowering users to address multiple errors simultaneously. 

And the best part? All of these things take place on the Autodesk platform. In addition to offering a single source of truth, project stakeholders can work collaboratively in a shared environment, facilitating seamless communication, improved coordination, and streamlined decision-making throughout the project lifecycle. 

Experience the future of BIM clash detection 

BIM clash detection is vital in modern construction, enabling project teams to identify and resolve design conflicts before construction begins. 

And by leveraging BIM clash detection tools like Navisworks and Autodesk BIM Collaborate, construction professionals can streamline the clash detection process, saving time, reducing costs, and increasing the project's overall quality.  

Discover how these two solutions—and other Autodesk tools—can help you drive better project outcomes.   

Grace Ellis

As Manager of Content Marketing Strategy at Autodesk and Editor in Chief of the Digital Builder Blog, Grace has nearly 15 years of experience creating world-class content for technology firms. She has been working within the construction technology space for the last 6+ years and is passionate about empowering industry professionals with cutting-edge tools and leading strategies that improve the quality of their jobs and lives.
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We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
NMPI Display
We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
VK
We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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