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Materials & Specificationsaka: precastaka: tilt-upaka: precast panels

Precast Concrete

In Plain English

Concrete elements manufactured in a factory and delivered to the site ready to install.

Definition

Precast concrete consists of structural or architectural elements that are cast and cured in a controlled factory environment before being transported to the job site for installation. Precast elements include wall panels, beams, columns, stairs, and hollow-core slabs. Factory production allows higher quality control and faster on-site erection compared to cast-in-place concrete.

Why It Matters in Bidding

When specs call out precast concrete, estimators must split it cleanly from cast-in-place scope so structural and architectural elements aren't double-counted or dropped at buyout. The plant-fabricated nature drives procurement risk: shop-drawing approval and production slots are long-lead items that can dictate the project's erection start and downstream trade sequencing. Freight, crane, and erection labor are separate cost line items that a unit price alone won't reveal.

Example

Reviewing a mid-rise spec, the estimator carries the architectural precast cladding panels as a separate subcontract from the structural slab work and flags the shop-drawing approval window as a long-lead item in the bid schedule.

Related Terms

ConcreteRebarComposite MaterialSpecifications Document

Frequently Asked Questions

Most estimators carry precast as a specialty subcontractor number covering engineering, fabrication, and often erection, then add general-conditions items the sub excludes—crane, freight, unloading, and grouting or caulking of joints. Confirm exactly what the precaster's proposal includes so excluded scope is picked up elsewhere and the bid stays complete.
Precasters frequently exclude the foundation and embeds, cast-in-place connections, crane and erection access, joint sealants, fireproofing, and final patching. They may also exclude engineering of connections to the supporting structure. Estimators should read exclusions line by line and assign each gap to another trade so the scope is fully covered at award.
No piece can be cast until shop drawings clear the engineer of record, and the approval cycle plus plant scheduling sets the earliest possible delivery. Because this drives the erection start and following trades, estimators should treat shop-drawing turnaround as a defined schedule activity and confirm the approval responsibilities at buyout.

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