"...the quality assurance you need and our clients deserve."

About CTL
From soil compaction to structural steel inspection,
you can be assured that your job has met or exceeded all applicable codes and standards.
Certified Testing Laboratories, Inc. (CTL) is an independent materials testing/inspection agency that has provided services for clients since 1958.  CTL services Connecticut, New Jersey, New York, and Pennsylvania.

Our qualified staff performs on-site construction testing and inspection services, in accordance with the pertinent codes and regulations (AWS, API, ASME, ASTM E-329-70, SNT-TC-1A, ASNT), for the following areas... ​​

  • Footing Inspections, Bearing Capacity / K-Bar Drop Hammer
  • Stabilized Subgrade Inspections; Proofroll 
  • Controlled Fill / In-Place Density, Compaction Testing (Nuclear & Sand Cone methods)
  • Materials / Quantity verification inspections: rock, fill, etc.
  • Bituminous Paving Plant & Field Inspections


  • Masonry
  • Grout
  • Fireproofing
  • Wire Mesh Placement
  • Floor Flatness
  • Sampling of Diamond Core Drilling
  • Testing of Moisture Vapor Emission Rate
  • Pull-out testing

  • Structural Steel (shop & field testing)
  • High Strength Bolt Testing / Plumb Inspections
  • Visual Weld Examinations
  • Metal Deck Installation
  • Shear & Studs
  • Reinforcing Steel

  • Ultrasonic
  • Radiography
  • Liquid Penetrant
  • Magentic Particle
  • Welder Qualifications

  • Soils and Foundation Analysis (Test Pits, Borings, Infilitration)
  • Civil Site Development Recommendations
  • Dams, Levees, and Embankments
  • Earth Retaining Structures​

Certified Testing Labs is not limited to the above inspection services.  
Please contact us today to see if we can perform your testing needs!