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Structural

Beam

In Plain English

A horizontal bar that holds up floors or roofs by transferring weight to columns or walls.

Definition

A horizontal structural member that spans between supports and carries loads perpendicular to its length. Beams transfer loads from floors, roofs, and walls to columns or walls. They resist bending moments and shear forces generated by the loads they support.

Why It Matters in Bidding

Beams are core structural-takeoff items where the specified material and size, structural steel, glulam, LVL, or concrete, drives the bid across multiple trades and lead times. Heavy or long-span beams can dictate crane size, connection detailing, and erection sequence, all of which carry cost beyond the member itself. Estimators who quantify beams straight from the structural drawings and capture the associated connections, fireproofing, and lifting requirements avoid the common gap between a clean material count and the real installed cost.

Example

Taking off the structural steel package, the estimator tallies each wide-flange beam by size and length, adds the bolted and welded connections, and notes a long transfer beam at the lobby that will require a larger crane pick than the rest of the frame.

Related Terms

GirderJoistColumnSpan

Frequently Asked Questions

Beyond length and section, capture connections, base and bearing details, camber requirements, fireproofing or intumescent coating, and any special erection needs like heavy picks or temporary shoring. Long-span or transfer beams may drive crane size and sequencing. These associated items often cost as much as the steel and are easy to omit.
Steel, glulam, LVL, and reinforced concrete beams differ in unit cost, lead time, connection method, and the trade that installs them. Engineered wood may ship faster but span less; steel needs detailing and fireproofing; concrete ties to formwork and pour scheduling. Match each beam to the spec so pricing reflects the right trade and lead time.
Long or heavy beams often require larger cranes, more complex rigging, temporary bracing, and tighter erection sequencing, all of which add labor and equipment cost. They may also need camber and special connection detailing. Flagging these members during takeoff lets you price the lift and sequence rather than just the steel weight.

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