![]() Spacing between joists and rafters contributes to load variables too. People and animals are live load factors, and snow can be a separate load consideration or part of the live load. A plank used for a floor joist commonly has different load factors than a ceiling joist or rafter.įloor joists may support drywall ceilings on the underside and marble tile and furniture on the top, which are all factors affecting the dead load. Loads are divided into live or snow loads and dead load considerations. Bedrooms commonly don’t have more than 2 or 3 occupants moving around, while a living room may have 10 or more, so load requirements for living and sleeping areas often differ.Ģ圆s may be used for floor joists, ceiling joists, or rafters and have differing spans for the same grades and species. Location frequently has load variables too. Wood species and grade identify strength, which in turn determines load capacities and deflection over distance. Ceiling joists don’t normally have the same load restrictions, and so can span greater distances. Based on building codes, a 2×6 can span anywhere from 2’-1” to 20’-8” depending on the affecting factors. The distance a 2×6 can span is determined by the species, grade, location, use, load, and spacing. #RAFTER SPAN CODE#Since some structural variables are localized, it’s best to check your local code for allowable spans.Ī general rule of thumb for joist span is 1-1/2 times a board’s depth in feet, however, it’s not that simple. The allowable distances it can span without support are identified in National, State, Provincial, and Local Building Codes. How Far Can a 2×6 Span Without Support?Ī 2×6 can be used for floors, walls, ceilings, roofs, and other facets of construction. Hockey arenas, gymnasiums, and airplane hangars are examples of long span construction. This provides larger unobstructed spaces or rooms. #RAFTER SPAN FREE#Plus, there is the free span or long span that commonly refers to structures without intermediate internal supports, so all loads are carried on exterior walls. The clear span is the space between adjacent support faces. To add to the confusion, there is the effective span which is measured from the center of one support to the center of the next support. Rafters span greater distances from support center to support center, but the horizontal distance from centerline to centerline is often the same as that of a joist. Loads limit joists to shorter spans than rafters of the same grade and species. The span differs, however, if it is horizontal like a joist or beam, or diagonal for rafters. It is measured from the center of one support to the center of the next. Span, in construction, means the distance a structural member traverses from support to support. There are many terms that have different meanings, and span is one such word. Span Definition – What Does Span Mean in Construction?
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