Sioux City: 712-252-5132

Serving the Tri-State Area

Certified Testing Services Inc - Logo

Storm Lake: 712-213-8378

Structural Steel

When working on a construction job, the steel you use is fabricated at a shop prior to being brought to your site. This is a good thing! It allows for a division of two basic inspection steps – shop inspection and field inspection.


When you hire Certified Testing Services Inc, you can feel confident in our steel inspections as we have over 30 years of experience in the construction testing industry. Our in-field steel quality assurance provides expertise and high-quality equipment like no one else in the industry.

Fabricated steel inspections

Construction steel services

  • Bolted fabrication inspection

  • Torque testing of bolted connections

  • Visual weld inspection

  • Reinforcing steel inspection

  • Fireproofing inspection and testing

We know how to keep your jobsite safe. Call us to learn more about structural steel inspections!

Sioux City:


or Storm Lake:


Thoroughly inspecting all structural steel

structural steel