The weight of people, furniture, snow, and other movable items that a building must support.
A variable, movable load on a structure caused by the occupants, furniture, vehicles, equipment, snow, or other non-permanent items. Live loads can change in magnitude and position over time and are specified by building codes based on occupancy type. Structural members must be designed to carry both dead loads and the maximum anticipated live loads.
Live-load values drive structural member sizing, which directly affects quantities of concrete, rebar, steel, and framing an estimator carries. When an owner specifies heavier-than-code live loads for storage, assembly, or equipment areas, member sizes and costs climb, so bidders must read the structural notes carefully rather than assume baseline occupancy loads.
Pricing a warehouse mezzanine, an estimator notes the structural drawings call for a 125 psf live load instead of typical office loading, which upsizes the steel beams and increases the framing tonnage carried in the bid.
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