Structural · S-MCGWG

Typical Slab on Deck Penetrations and Welded Reinforcement

Materials

Concrete Reinforced Concrete Steel

Elements

Beams Floors / Slabs Decks Connections / Plates Reinforcing Roof / Floor Openings

Connections

Welded Connection Deck Attachment

About this detail

Spacing requirements, maximum width limitations, and hole placement rules govern round openings up to six inches in diameter cut into a concrete slab on steel deck without extra slab reinforcement. Penetrations must not cut through more than one deck web, and horizontal spacing between adjacent holes requires a twelve-inch minimum through the top of the deck flute and an eighteen-inch minimum through the deck web or bottom flute. The maximum total width of penetrations in a ten-foot width perpendicular to the direction of the deck span is twenty-four inches. When welded reinforcement is required, ASTM A706 grade sixty reinforcing bars weld to a minimum plate thickness using specified fillet weld sizes corresponding to bar sizes from number four to number eleven.

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