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TJ-Pro™ Rating

Floor performance by the numbers

For more than 50 years, builders have looked to the Trus Joist® name for guidance on floor performance. Our decades of proven success with TJ-Pro™ Rating is one of the biggest reasons why.

Builders use TJ-Pro Rating to:

  • Design Floors their customers expect
  • Manage performance through purchase decisions
  • Learn why span charts are not treasures of performance or customer satisfaction
  • Balance image, efficiency and financial goals


Decisions are made on one or a combination of three factors: efficiency, image and economy. Many variables affect customer satisfaction ratings, some of which include:

  • Basic Stiffness is a combination of joist depths and span.
  • Composite Action — Careful nailing in conjunction with construction adhesives increases basic stiffness.
  • Continuity — Continuous joists over several supports generally perform better than simple spans. Care must be taken if the joists continue into another occupancy.
  • Joist Spacing and Deck Stiffness —Reduced spacing or increased deck thickness generally improves floor performance.
  • Ceilings directly applied to the bottom edge of the floor members, or equivalent 1x or 2x strapping, is a performance enhancement.
  • Beams — Floor systems supported by steel or wood beams tend to feel less stiff than those supported by solid bearing walls.
  • Bridging or Blocking can be a contributor to improved floor performance.
  • Non-bearing Partition Walls dampen vibration and improve floor performance when installed transverse to the floor joists.
  • Mass reduces damping in a floor system, causing a decrease in floor performance. This impact is more noticeable as span lengths increase.


Product Literature

  • svc-4005 - Product Overview: TJ-Pro Ratings
  • svc-4006 - Trus Joist TJ-Pro Rating Q&A
  • tb-104 - Information About Floor Performance