Structural · S-4J6EH

Roof Cross Tie and Steel Joist Bracing Detail

Materials

Steel Timber / Wood

Elements

Beams Roofs Bracing Reinforcing

Connections

Bracing Connection Timber / Mass-Timber Connection

About this detail

A roof cross tie connection frames into an open-web steel joist with diagonal wood bracing and Simpson strap anchors. A triple 3x Douglas Fir No. 1 top plate runs continuously across the steel joist, secured with 3/8-inch diameter by 2-inch wood screws at 18 inches on center staggered. A Simpson heavy-duty strap such as CMST12, MST60, MST48, MST37, MST27, or MSTI26 ties the wood members together using specified quantities of 16d or 10d nails split equally across each connected member with staggered nailing lines. An extra layer of 90-pound roofing felt is placed over the exposed steel strap. A diagonal wood joist brace of Douglas Fir No. 2 connects to the steel joist using a five-eighths inch diameter machine bolt and four 10d nails at the lower connection point. A 4x4 or 4x6 Douglas Fir No. 2 minimum member sits beneath the nail strap at warehouse or office areas, with a 6x8 Douglas Fir No. 2 minimum member at Simpson "W" hangers where applicable.

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