Bar Joist Construction : Construction which uses joists consisting of very light-weight steel truss-shaped members; it can include either noncombustible or combustible roof and floor decks supported on bar joists
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}