The steel channel stringer supports concrete-filled stair treads, with specific tread dimensions and structural requirements referenced on the structural plans. The stair assembly terminates at the floor slab, where a control joint is provided and filled with a backer rod and flexible sealant color-matched to the concrete. Concrete fill for the treads is installed by others following the placement of stair insulation. The structural steel support and fire protection requirements are governed by the structural and fire protection plans.
CHANNEL STRINGER, RE: STRUCTURAL CONCRETE FILLED STAIR TREADS, RE: PLAN LANDING RE: PLAN RE: STRUCTURAL & FIRE PROTECTION PLAN FOR REQUIRED RATING. CONTROL JOINT TO BE FILLED WITH BACKER ROD AND FLEXIBLE SELANT TO MATCH CONCRETE COLOR CONCRETE FILL BY OTHERS AFTER STAIR INSULATION
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