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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.
- Terms and Tips for Environmentally Responsible Building
- Trus Joist TJ-Pro Rating Q&A
- Product Overview: TJ-Pro Ratings
- Information About Floor Performance