![]() This provides larger unobstructed spaces or rooms. 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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