A 4x6 wood blocking fits between truss purlins above a structural steel truss girder. Steel plates measuring 1/4 inch by 4 inches by 7 inches are located on each side of the truss purlins and secured with two 3/4-inch diameter through-bolts at a 4-inch gauge. Two rows of nailing are specified at blocking spacing, with additional lines required depending on the nailing pattern configuration.
TRUSS GIRDER 4x6 BLOCKING BETWEEN TRUSS PURLINS PL 1/4"x4"x0'-7" EACH SIDE LOCATED 2'-0" FROM EACH SIDE OF TRUSS PURLINS W/ (2) 3/4"Ø THRU BOLTS @ 4"GA. 4" 1 1/4" 1/4 4 (2) ROWS AT BN SPACING (4 LINES WHERE BN IS STAGGERED, 6 LINES WHERE 3 LINES OF NAILING IS REQD)
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