Unbonded P-T Support

From initial design through construction, we provide expert product support to help make your projects successful. Discuss your application with us today!

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Unbonded Monostrand Post-Tensioning

Adaptable to a variety of structures, unbonded monostrand can be easily, rapidly, and economically installed. Applications for monostrand systems include elevated slabs, slab-on-grade, beams and transfer girders, joists, shear walls and mat foundations.

Our unbonded systems feature 0.5” and 0.6” diameter strands coated with a layer of specially formulated grease. The outer layer is seamless plastic extruded in one continuous operation to provide protection against corrosion. Each tendon is precisely coiled, cut, labeled, color-coded and delivered to the construction site. A wide variety of anchorage systems (see Product Information tab below) are available to meet design specifications.

Encapsulated unbonded monostrand systems are used in areas that are subject to corrosive conditions. Strands are protected at the anchorages using greased plastic sleeves and grease-filled end caps. Additionally, anchorage components are fully encapsulated in a high density polyethylene plastic covering and an optional encapsulated intermediate coupler anchorage system can be used to protect the strand at construction joints.

STRUCTURAL TECHNOLOGIES, a Structural Group company, is the exclusive designer and manufacturer of VSL post-tensioning and construction systems in the United States.

Download our entire catalog of post-tensioning systems, or browse individual systems below:



Product Description Technical  Data
S5N Bare Anchor 0.5" PDF
S6N Bare Anchor 0.6" PDF
S-6 Anchorage PDF
SF-6 Dead-End Anchorage PDF
SK-6 Monostrand Coupler PDF
S5CP+ Anchorage PDF
Contact us for additional information on custom anchorages for specific project needs.

Strand Properties

Product Description Technical  Data
Strand Post-tensioning strand and tendon properties PDF

Shear Rails

Product Description Technical  Data
Shear Rails Shear reinforcement PDF


Product Support

STRUCTURAL TECHNOLOGIES provides comprehensive services and support for post-tensioning systems – for both new construction, as well as repair of exisitng structures. To ensure project success, our knowledgable staff supports clients throughout design and construction with:


Engineering & Design Support

Engineering & Design SupportBecause each project presents a unique opportunity, STRUCTURAL TECHNOLOGIES teams with contractors, owners, and engineers to evaluate projects and determine optimal solutions. Our engineers have extensive experience in structural design and are active members of technical organizations such as the Post-Tensioning Institute (PTI), the American Segmental Bridge Institute (ASBI) and the American Concrete Institute (ACI).

Our comprehensive range of design support services includes:

  • Feasibility studies and cost estimates
  • Preliminary designs
  • System and material selection
  • Detailing
  • Installation and quality control plan development

Manufacturing & Material Supply

Post-Tensioning ManufacturingSchedule is critical to the success of your projects. STRUCTURAL TECHNOLOGIES works diligently to manufacture and deliver our products on time. All of our manufacturing facilities in the United States are certified by the Post-Tensioning Institute’s (PTI) Plant Certification Program to ensure the highest quality fabrication of materials and equipment. Dedicated project coordinators and project managers work closely with contractors and engineers to ensure accurate and timely delivery of material, equipment and services.




Project Coordination

Project CoordinationFor post-tensioning projects, STRUCTURAL TECHNOLOGIES utilizes our proprietary PT Builder software that allows digital recognition of post-tensioning drawings and automatically generates tendon schedules – showing identification tags, quantities, lengths, color codes and tendon elongations. PT Builder also generates detailed schedules detailing the heights and quantities of the chair supports. Shop fabrication orders are automatically generated and fed directly to computerized strand cutting lines resulting in superior accuracy and efficient installation.




Installation Support

Post-Tensioning Installation SupportSTRUCTURAL TECHNOLOGIES’ highly trained field leadership provides expertise in all areas of post-tensioning installation services. For critical activies such as stressing and grouting, our technicians are certified by the Post-Tensioning Institute (PTI) and the American Segmental Bridge Institute (ASBI). Our staff is available to provide on-site training and supervision or to install systems. Available equipment is expertly maintained and calibrated by skilled mechanics prior to jobsite delivery.

For bonded systems, STRUCTURAL TECHNOLOGIES provides expert support in all aspects of installation, including grouting – a critical component for durability. To read more about grouting, see the VSL Technical Report, Grouting of PT Tendons.




Equipment Rental

Post-Tensioning Equipment RentalIn addition to having the required equipment available for sale or rent, STRUCTURAL TECHNOLOGIES can provide the necessary training tools and field support technicians to ensure safe operation and installation. STRUCTURALTECHNOLOGIES’ equipment offers the latest advances in post-tensioning and are continuously improved to enhance safety and ease of installation. Available equipment for rent includes:

  • Stressing Jacks
  • Strand Cutting
  • Strand Pushers
  • Strand Coilers
  • Grout Mixers and Pumps
  • Heavy Lifting Jacks
  • Form Travelers


  • Shear Rails
    Shear Rails

    Developed to mitigate the impact of punching shear at slab-column connections, STRUCTURAL TECHNOLOGIES provides VSL Shear Rails that consist of large head steel studs that are welded to flat steel rails. When used at the column and slab connection, the shear rails increase the shear capacity of the slab.

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  • Barrier Cables
    Barrier Cables

    VSL offers several different levels of service for barrier cable systems. Involvement ranges from supplying systems, installation equipment and placement drawings to furnishing and installing barrier cables along with a full complement of steel components such as posts and angles.

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  • Bonded Multistrand Post-Tensioning
    Bonded Multistrand Post-Tensioning

    Extensively used in bridge and transportation structures, bonded multistrand post-tensioning systems have also been successfully applied to commercial building construction.

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  • VSLAB®+ Bonded Slab System
    VSLAB®+ Bonded Slab System

    These bonded multistrand post-tensioning systems have been successfully applied to commercial building, healthcare and parking structure construction by VSL. Benefits include enhanced crack and deflection control and a reduction in reinforcing steel.

    Learn More






STRUCTURAL TECHNOLOGIES, a Structural Group company, is the exclusive designer and manufacturer of VSL post-tensioning and  construction systems in the United States. VSL systems have a well-earned reputation for their quality, reliability, and durability - and have been used throughout the world since 1956 to build, repair, and strengthen bridges, buildings, tanks, and special structures. For information on VSL products outside of the United States, visit the VSL International website www.vsl.com.

With companies dating back to 1902, Structural Group is firmly committed to its ongoing mission of making new and existing structures stronger and last longer. Through its companies, Structural Group delivers turnkey solutions that integrate technology, engineering, and construction. Structural Group provides specialty contracting services through our construction companies and state-of-the-art proprietary products and engineering support services through STRUCTURAL TECHNOLOGIES.

Learn more about Structural Group and its member companies.

VSL is the registered trademark of VSL International Ltd.