Weyerhaeuser believes that the TJ-Pro™ Rating System for Trus Joist® TJI® joists is the most comprehensive indication of floor performance ever developed for wood-based assemblies.
We have thoroughly investigated floor performance for floors framed with TJI® joists and structural composite lumber(SCL) products. We have conducted field investigations of typical assemblies and a comprehensive subjective survey of field floors to investigate the relative "feel" of these typical floors. The components of a floor assembly that can influence the feel of the floor include:
- joist stiffness and spacing
- joist span
- continuous member or single span
- deck stiffness
- composite action between joist and deck
- effects of ceilings and bridging
- effects of transverse partitions
- whether supports for joists were walls (considered rigid) or beams of some defined stiffness
The proprietary algorithm behind TJ-Pro™ Rating takes these elements into account. TJ-Pro Ratings
are correlated to customer satisfaction which takes the guesswork out of floor system design. For more information see page 4 of the TJI® Specifiers Guide and our Floor Performance brochure.
More information about floor performance is also available in Technical Bulletin TB-104. Since floor performance is influenced by many factors, it's best to model the specific job conditions in our software.