![]() Maximum Spans for Joists, Rafters and Beams Chart Span-by-Span: a term used to identify construction methods for erecting bridges or other large structures requiring multiple long spans often of precast, prefabricated or pre assembled components.įree Span: typically, another term for span, it is the free or unsupported space provided between the supports of a structural component. Long Span: identifies a construction method that typically results in buildings with unobstructed support free spaces greater than 100-feet, such as factories, warehouses, stores, sports arenas, and barns. The bean is multi-spanned, as is the floor being supported. For example, a beam carrying a floor being supported at the ends and with equidistance intermediate posts along its length. Multi-Span: commonly refers to a structural member spanning across multiple supports to minimize bending stresses. Single Span: means the structural member – beam, joist, floor, slab, or rafter – is only supported, pinned, or fixed at its ends. Don’t let them confuse you, they are just ways to identify unique aspects of different structural spans. You may come across the terms single span, multi-span, long span, and even span-by-span in construction. It typically is used when identifying the free or unsupported distance of a beam, joist, slab, floor, header, or rafter between structural supports such as posts, walls, or beams. It refers to the distance, gap, or space between supports that carry the structural piece. In the construction industry, span is the term used to identify the unsupported distance a structural member or component traverses or bridges between supports.
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