Construction Inspection and
Materials Testing Services (QA)

7NT labs offer a wide variety of physical and chemical analyses for soil, rock, and other construction materials.

Our lab works closely with our engineers to ensure we perform the most effective array of tests; that yield the most appropriate results for the job at hand. We always strive for the highest quality data and results by adhering to many widely accepted testing procedures, such as ASTM test methods. 7NT’s labs are accredited by: AASHTO, The Ohio Department of Transportation, The Indiana Department of Transportation, and The United States Army Corps of Engineers.

Construction Inspection Services:

  • Bid analysis
  • Constructability review
  • Value engineering
  • Site evaluation/planning
  • Reinforcing steel inspection
  • Structural steel & weld inspection
  • Building construction inspection
  • Earthwork inspection
  • Erosion control inspection
  • Utility inspection
  • Foundation inspection
  • TBM inspection
  • Shaft (Launch, Retrieval, Intermediate, Working, Utility Inspection)
  • Levee inspection
  • Construction Administrative Services

“Thanks for your dedication. Please extend my Thanks to the Crew. This is what makes my job easy, keep up the Great Job!”

Jerry L. Jung, P.E. • Metropolitan St. Louis Sewer District

Materials Testing Services:


  • Controlled Fill Construction Testing & Inspection
  • Deep Foundation Installation and Bearing Inspection
  • Shallow Foundation Installation and Bearing Inspection
  • Subgrade Inspection for Pavement & Slabs
  • Soil Erosion Control Analysis, Inspection & Permitting

Structural Steel

  • Fabrication Shop Inspection
  • Welded & Bolted Connections Inspection & Testing
  • Magnetic Particle Testing
  • Liquid Dye Penetrant Testing
  • Weld Procedure Qualification & Certification
  • Fireproofing Thickness, Adhesion & Density Testing


  • Placement Inspection: Reinforcing Steel Placement, Slump, Air Content, Unit Weight
  • Batch Plant Inspection
  • Floor Flatness/Levelness Testing
  • Pre-Cast Concrete Inspection
  • Non-Destructive Evaluation

Field/Lab Testing

  • Field CBR Test
  • Field Plate Test
  • Field Vane Shear Test
  • Standard Penetration Test
  • Field Density & Moisture Test
  • Dynamic Cone Penetrometer Test
  • Field Density by Nuclear Method
  • Rock Coring
  • Groundwater Monitoring

Roofing Services

  • Roofing Materials Verification
  • Roofing Installation Inspection
  • Single Ply Construction Verification
  • Built-Up Construction
  • Infrared Surveys
  • Insulation Analysis & Recommendations


  • Asphalt Coring
  • Density Testing In-Place (Nuclear Method)
  • Batch Plant Testing and Inspection
  • JMF Verification
  • QC and QA Plant Testing


  • Structural Reinforcing Steel Placement & Materials Analysis
  • Ferro-scan Reinforcement Detection Services

Featured Projects


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