In modern construction, a contractor’s reputation rests on two things: the quality of the work and the ability to prove it meets building codes. Central to that proof is the International Building Code (IBC), the framework that keeps the built environment safe, durable and resilient.
As projects grow more complex and municipal resources stay thin, one question matters more every year: who verifies that the work meets these standards? On most public-sector and infrastructure projects, owners bring in an independent third party to answer it.
Effective inspection takes more than familiarity with a spec sheet. Inspectors have to understand and comply with an owner’s specific requirements, which usually means a certification or qualification program behind the person doing the work.
What is NDE? What is NDT?
The terms get used almost interchangeably. They aren’t the same thing.
“NDT generally refers to specific tests, whereas NDE is a larger umbrella term that includes NDT testing and also refers to analysis of the results,” says James Bowen, CWI, ASNT Level III, and ECS’s Corporate NDE Level III. “NDT is measuring corrosion in a piping system. NDE is using that data to determine what’s causing the corrosion, so you can prevent it.”
Non-destructive testing (NDT) is the physical test: an ultrasound on a weld, a visual check of a bolted connection. Non-destructive evaluation (NDE) is the layer above it: interpreting that data to determine whether a defect actually compromises the structure. One produces a reading. The other decides what the reading means.
IBC Chapter 17 turns technical standards into structural law
Safety and legal compliance meet at IBC Chapter 17: Special Inspections and Tests. Chapter 17 adds Quality Assurance to site construction, extending inspection to a building’s structural elements — steel, concrete, masonry and foundations.
Organizations like AISC, AWS, SJI, SDI, AISI and RCSC write the technical standards for structural steel, joists and the welds and fasteners that join them. IBC gives those standards legal enforcement on-site.
That enforcement runs through a clear division of labor. “Quality control is how the contractor builds quality into the work,” Bowen says. “Quality assurance is the independent verification that those quality control processes are working as intended.” Codes require both. The contractor owns QC. The special inspector provides independent QA. Knowing this separation is what creates accountability.
ECS is a certified third-party inspection agency providing Special Inspections under IBC Chapter 17. See how ECS applied integrated QA/QC and inspection services on a 2.4M SF EV battery facility.
The path to becoming an NDE inspector
NDT/NDE personnel work under a recognized certification program — most commonly American Society for Nondestructive Testing’s (ASNT) SNT-TC-1A or CP-189, which set up a three-tier structure:
- Level I technicians run specific tests under a Level II or III’s direction.
- Level II technicians set up equipment, conduct tests and interpret results against written procedures.
- Level III personnel (James Bowen’s level) write those procedures, train and certify the technicians below them and carry responsibility for the company’s NDE program.
There’s more than one way in and it doesn’t always come in the form of a college degree. Some inspectors come up through welding and earn AWS’s Certified Welding Inspector (CWI) credential. Others enter through NDT technician training. In 2024, AWS registered “Welding Inspector” as a national apprenticeship occupation with the U.S. Department of Labor — the industry’s first formally recognized path that combines classroom instruction with paid, on-the-job training.
James Bowen began his career as a commercial diver in the Gulf of Mexico, was introduced to underwater ultrasonic and magnetic particle inspection and worked his way up through structural steel inspection and bridge safety inspection before becoming ECS’ second Corporate NDE Level III.
“Certification is important, but it’s only one piece of the qualification puzzle,” he says. “A certification demonstrates that an individual has achieved a recognized level of knowledge. What it does not guarantee is experience, judgment or the ability to navigate complex field conditions. Certification is a milestone, not a destination.”
Why mentorship closes the gap
Certification proves someone is qualified to enter the profession. It doesn’t mean they’ve mastered it. That gap — between passing an exam and developing real field judgment — is where mentorship does its work.
“The people who excel in this profession are lifelong learners,” Bowen says. “They continuously expand their knowledge, seek mentorship and understand that expertise is built over years of experience, not acquired through a certification or training course.”
It’s a gap he’s spent much of his career closing directly. As ECS’ Corporate NDE Level III, Bowen oversees the company’s NDE Written Practice, certifies personnel performing NDT testing, develops written procedures and audits NDE operations across ECS’ offices. “My passion is teaching, training and mentoring new inspectors,” he says. “I’m honored to be given this opportunity and I look forward to continuing to grow our NDT services and ECS’ standard of excellence.”
Because James grew up through industry and apprenticeship rather than academia, Bowen sees it too often mistaken for a trade rather than a technical profession. “NDE professionals are often asked to make critical assessments about the condition, integrity and safety of structures and components,” he says. “That requires an understanding of materials, manufacturing processes, welding, construction practices, applicable codes and the limitations of the inspection methods themselves. When NDE is done well, most people never notice it.”
Where judgment matters most
Training and mentorship aren’t abstract. They show up in moments like these — where the difference between a passed inspection and a hidden failure comes down to an inspector who knows what to look for, not just how to run the test.
1. Incomplete fusion in a “moment” connection
During high-rise construction, certain beams weld directly to columns. These connections help the building resist high wind and seismic loads. A visual inspection of the completed weld can show a clean, uniform bead — and still hide the problem.
Without ultrasonic testing, an area of incomplete fusion — where the weld metal never actually bonded to the base metal — stays invisible. That connection is designed to carry the load of a severe storm. If it fails under that load, the building’s stability is at risk.
The root cause of a failed weld often starts before the weld itself, in poor fit-up or joint geometry, or during welding, when a procedure isn’t followed. A QA inspector who understands the range of ways noncompliant work happens is what catches this — not the visual bead alone. Paired with volumetric testing, that’s what gives owners real confidence the connection holds under the most severe conditions.
2. Laminar tearing in heavy steel shapes
In tall structures, columns — often “jumbo” shapes — require particular care when welding. Residual stress in massive shapes, combined with uneven cooling around a weld, can cause lamellar tears in the base metal next to it.
Some steel plates carry internal, microscopic discontinuities from manufacturing that act as weak points. A standard visual check can’t see them. Straight-beam ultrasonic testing can identify these defects after welding and post-heat treatment.
In seismic design, there’s no room for error. A third-party inspector’s job is confirming that the fabricator’s material meets the demands of the engineer’s seismic calculations — something a visual check alone can’t do.
3. Hitting tension cables in post-tensioned concrete
A contractor needs to core a hole through a floor for new plumbing or electrical runs in a post-tensioned (PT) building. Accidentally severing a PT tendon is catastrophic, and the repair is costly. GPR and concrete scanning services — a form of NDE — see through the concrete to map exactly where the high-tension cables sit.
This is loss prevention. Drilling and hoping does not suffice.
The bottom line
“Testing finds problems,” Bowen says. “Inspection prevents them. The earlier we’re involved in a project, the greater our ability to influence quality, safety and cost.”
That’s the case for bringing a certified third-party inspection team in early — not as a final checkbox, but as a partner through the build.