Precast Concrete
Concrete elements made in a plant and erected on the job site.
Quick Answer
Precast concrete is concrete cast into reusable forms and cured in a controlled factory environment, then transported to the site and lifted into place. Typical products include wall panels, double tees, beams, columns, and stairs. It speeds site work and improves quality control but needs early design coordination, connections, and crane planning.
The Full Picture
Precast concrete moves much of the concrete work from the field into a plant. Elements are cast in steel or concrete forms, often with prestressing strands, and cured under controlled temperature and humidity. This produces consistent quality and allows structure and finish, such as architectural panels, to be produced together.
Common precast products include architectural and insulated wall panels, hollow-core planks, double tees, beams, columns, stair and landing units, and parking-structure components. Elements are connected on site with welded plates, grouted joints, or bolted connections, and joints between panels need sealants and detailing for movement and weather.
Precast succeeds when it is planned early. Panel sizes are limited by what can be shipped and lifted, the layout should repeat to use forms efficiently, and connections and openings must be coordinated with the structural, architectural, and MEP drawings. Precasters typically produce their own engineered shop drawings, which the engineer of record and architect must review.
For preconstruction teams, precast brings specific questions. Who is responsible for connection design, what is the production lead time, how will panels be delivered and set, what crane capacity and site access are needed, and how are tolerances reconciled with adjacent trades? Misaligned scope between the precaster, steel, and erector is a frequent source of gaps in bids.
Real Examples
Common Misconceptions
People assume: Precast is always faster and cheaper than cast-in-place.
Actually: It depends on repetition, project size, site access, and crane needs. Small or highly irregular projects may not benefit, and long fabrication lead times need to be built into the schedule.
People assume: The precaster designs the whole structure.
Actually: The engineer of record sets the overall structural design and performance requirements. The precaster usually designs individual elements and connections to that criteria, subject to review.
Does MeltPlan Solve This?
Partially — adjacentPrecast scope shows up across the architectural, structural, and specification documents, so it is easy to miss or double count during preconstruction. MeltPlan's takeoff service can quantify precast elements from the drawings, and its design review can flag missing or conflicting requirements in the document set. It does not design precast elements or connections.
Review drawings for precast scope and coordination gaps →Frequently Asked Questions
What is the difference between precast and prestressed concrete?
Precast describes where the concrete is cast, in a factory. Prestressed describes a method of pre-compressing it with tensioned strands. Many precast elements are prestressed, but not all are.
What are common precast concrete products?
Wall panels, hollow-core slabs, double tees, beams and girders, columns, stairs, and parking-structure components are among the most common.
What is a typical precast lead time?
It varies widely by plant workload, element type, and shop drawing approval, so lead times should be confirmed with the precaster early and built into the schedule rather than assumed.
What should be coordinated early on a precast job?
Panel layout and sizes, connection design responsibility, openings and embeds for other trades, delivery and crane planning, tolerances, and the sequence relative to foundations and adjacent structure.