Construction Materials Testing

Since our founding in 1964, TTL has provided quality assurance testing and inspection services for various clients including federal and state agencies, city and county governments, boards of education, universities, healthcare providers, industrial facilities and private developers.

Special Inspections

TTL provides special inspection services in accordance with Chapter 17 of the International Building Code (IBC). Our inspectors are International Code Council (ICC) certified to provide inspection of:

  • Prestress members
  • Reinforced concrete
  • Structural steel
  • Masonry
  • Fireproofing
  • Soils

Each day our special inspectors will coordinate our services with the project manager and communicate our findings in a daily report. At the end of each project, we will provide a summary and final report of special inspections to the local building official to obtain the certificate of occupancy.

Steel Inspections

TTL has American Welding Society (AWS) Certified Welding Inspectors (CWI) as well as ASNT SNT-TC-1A certified Non-Destructive Testing (NDT) personnel. We provide testing and inspection services from the fabrication shop through completion of structural steel erection. Some of our services include:

  • Fabrication shop quality control audits and inspections
  • Review of welding procedures and welder qualifications (PQR, WPS, WPQR)
  • Phased Array (PAUT)
  • Ultrasonic Testing (UT)
  • Ultrasonic Thickness Testing (UTT)
  • Corrosive Mapping
  • Magnetic Particle Testing (MT)
  • Liquid Dye Penetrant (PT)
  • Visual Testing (VT)
  • Positive Material Identification (PMI)
  • Hardness Testing
  • Leak Testing (LT)
  • Bolted connection testing and inspection
  • Paint and coating thickness testing

Materials Engineering

TTL personnel are experienced in conducting property condition surveys. Our engineers have performed forensic studies of various building elements and pavements. Some of our services include:

  • Pavement evaluations
  • Roofing system surveys and consulting
  • Weatherproofing consultations
  • Concrete post-construction evaluation
  • Design of concrete mixes


TTL personnel are trained, certified and experienced in providing testing and observation of various work elements during construction. Our services include observation and testing for:

  • Site grading and fill placement
  • Deep foundation installation
  • Concrete placement
  • Concrete reinforcement
  • Floor flatness/levelness testing
  • Asphalt plant/lay down operations
  • Structural steel erection
  • Landfill liner CQA

Our personnel are certified through AWS, NICET, ACI, ICC, and state DOT’s.