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Concrete & Masonryaka: concrete reinforcementaka: steel reinforcementaka: WWRaka: wire mesh

Reinforcement

In Plain English

Any material — steel bars, wire mesh, or fibers — embedded in concrete to make it stronger and prevent cracking.

Definition

Materials embedded in concrete to provide tensile and flexural strength, including deformed steel bars (rebar), welded wire reinforcement (WWR), fiber reinforcement, and post-tensioning tendons. Concrete reinforcement is designed by structural engineers based on applied loads, spans, and code requirements. Proper placement, cover, and lap splice lengths are critical for structural performance.

Why It Matters in Bidding

Reinforcement is one of the most weight- and labor-intensive line items in a concrete bid, and small errors in bar size, spacing, or lap length compound across thousands of pounds of steel. Estimators must read structural drawings precisely because rebar tonnage, placement labor, and accessories like chairs and ties drive both material cost and crew productivity on award.

Example

Doing the concrete takeoff for a foundation, the estimator quantifies rebar by bar size and total tonnage from the structural schedule, adds lap-splice waste and accessories, then prices furnished-and-installed against a rebar sub's unit rate.

Related Terms

RebarPost-TensioningCompressive StrengthFormwork

Frequently Asked Questions

Estimators read the structural reinforcement schedule to determine bar size, length, and count, then convert to total weight using standard per-foot weights. They add lap-splice and waste allowances plus accessories like chairs, ties, and dowels, since installed cost depends on tonnage and placement labor, not just the bars.
It can be either. Many concrete subs price furnish-and-install rebar as one assembly, while larger jobs split fabrication and delivery from placement labor. Estimators should clarify the scope split during bidding so material and labor are not double-counted or left out of the concrete number.
Lap splices add bar length that increases tonnage and cost beyond the dimensioned member lengths, and required concrete cover affects bar placement and chair selection. Ignoring splice laps understates steel weight, while misreading cover requirements can drive field rework, so both belong in an accurate takeoff.

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