A series of closely spaced beams that directly support a floor or roof deck.
A closely spaced, secondary horizontal framing member that directly supports floor or roof decking. Joists span between beams, girders, or bearing walls and are typically lighter than the primary framing they rest upon. Steel bar joists, wood dimensional lumber, and engineered wood joists are common types.
Open-web steel joists at 4-foot centers span 30 feet between girders, supporting the metal roof deck.
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