Structural · S-QBZES

Floor Slab Depression at Roof Drain

Materials

Concrete Steel Glass / Glazing

Elements

Columns Beams Floors / Slabs Decks Arches Drainage Reinforcing

Connections

Shear Stud / Composite

About this detail

A depressed concrete topping bears on a steel deck at a roof drain location, supported by a structural steel beam. A drain and drain body are installed per mechanical drawings within the sloped topping, which is sized and positioned per architectural drawings. Three-quarter inch diameter by four-and-a-half inch headed shear studs are welded to the steel beam at the slab depression, with short studs restricted from extending beyond the edge of the depression. Lower layer reinforcing matches the typical slab reinforcement and extends two feet six inches past the edge of the depression on all sides. Additional slab bars extend two feet zero inches past the depression in each direction on each side, maintaining a minimum one-half inch clearance.

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