A four-by wood nailer is fastened to the top flange of a steel beam using seven-eighths-inch diameter welded threaded rods spaced at sixteen inches on center, staggered across the beam width. The rods are countersunk to a maximum depth of three-quarters of an inch. One rod is placed within nine inches of each end of the nailer and at each splice. The assembly includes two rows of nailing at beam-nailer spacing, with four lines used where the spacing is staggered and six lines where three lines of nailing are required. A five-inch diameter maximum hole is permitted for pipes at ten-foot intervals on center if required by approved sprinkler drawings. A two-and-a-half-inch minimum clearance is maintained for typical conditions.
4x NAILER x BM FLANGE WIDTH w/ 7/8"Ø WELDED THREADED RODS @ 16"OC STAGGERED ON BEAM COUNTERSANK (3/4" MAX). PLACE ONE ROD 9" MAX FROM EA END OF NAILER & FROM EA SPLICE. SUB-PURLIN SEE PLAN 8 1/2" ± STEEL BEAM SEE PLAN 16" 16" 32" NAILER PLAN VIEW (2) ROWS AT BN SPACING (4 LINES WHERE BN IS STAGGERED, 6 LINES WHERE 3 LINES OF NAILING IS REQD) 5"Ø MAX HOLE FOR PIPES @ 10'-0"OC MIN IF REQUIRED PER APPROVED SPRINKLER DARWINGS 2 1/2" MIN TYP USE 3x NAILER @ 22A
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