Construction Special Inspection

Twining has the resources to staff every project with experienced and professional inspection personnel. These highly skilled men and women have been selected for their diversity of knowledge and for their ability to work with clients to achieve maximum performance at minimum cost.

Our team currently consists of over two hundred inspectors throughout California, more than eighty percent of whom hold multiple inspection certifications in various aspects of construction including:

  • Structural Steel
    • Welding
    • High Strength Bolting
    • Curtain Wall Attachments
    • Shop Fabrication Inspection
    • Welding Procedure and Welding Qualifications
  • Concrete
    • Placement Inspection
    • Rebar and Tendon Placement
    • Pre and Post Tension Stressing
    • Concrete Sampling
    • Sampling of Reinforcing Steel
    • Precast Plant Inspection
    • Batch Plant Inspection
  • Masonry
    • Inspection of Layup
    • Block and Brick Sampling
    • Mortar Sampling
    • Grout Sampling
    • Precast Plant Inspection
  • Drilled-In Anchors
    • Epoxy Anchors
    • Mechanical Anchors
  • Spray-Applied Fireproofing
    • Cementitious Fireproofing
    • Intumescent Fireproofing

Our considerable pool of inspectors enables Twining Laboratories to provide our clients with the inspection support they need at any location, for any shift, as project needs arise. Our dispatch office is available 24 hours a day, 7 days a week.

Twining’s long-standing relationships with steel fabrication shops throughout the world allows our inspectors to provide seamless shop fabrication inspection no matter where it may take place. Our experienced staff has inspected the fabrication of structural steel as far away as Japan and Taiwan.

For over forty years, Twining has been signatory to an agreement with the International Union of Operating Engineers, Local 12. Due to the stability and benefits offered by our company, and the increased compensation paid to our inspectors and technicians, Twining attracts the very best personnel. Our inspection personnel are paid the prevailing wage as determined by the California Department of Labor, Director of Industrial Relations in accordance with Part 7, Chapter 1, Article 2, Sections 1770, 1773, and 1773.1 of the California Labor Code.

Nondestructive Examination

The field of nondestructive testing is undergoing rapid change, bringing technologies that had previously been the subject of research into the arena of practical application. Twining has been at the forefront of these applications; from participating in the post-Northridge SAC committees through being the first firm to fully implement the requirements of FEMA 353 and now AWS D1.8, to the field implementation of the latest technologies such as Phased Array Ultrasonics and Time of Flight Diffraction. Twining is fully compliant not only with ASNT SNT-TC1A, but with the stricter certification standards of CP-189.

  • Dye Penetrant
  • Magnetic Particle
  • Ultrasonic
  • Visual
  • Radiographic
  • Ground Penetrating Radar
  • In-Place Concrete Soundness
  • Floor Flatness and Levelness

Twining’s core testing services are overseen by Robert M. Ryan, CWI, ASNT NDT Level III, who has been with Twining and its affiliated companies since 1977. Mr. Ryan possesses vast experience in all areas of field inspection, and is a leading expert on all aspects of structural steel construction and nondestructive testing. As a principal of the firm, Mr. Ryan also provides strategic counsel and technical direction for many of our largest projects and has worked on some of California’s most distinguished landmarks including the J. Paul Getty Museum, Walt Disney Concert Hall and Disney’s California Adventure.