Pre-Engineered Metal Building
CSI Division 13, Special Construction
A structural system, often called a "PEMB" or "metal building system", engineered and manufactured as a complete kit of steel framing, roofing, and wall panels, designed by the manufacturer's own engineers to the project's specific loads and dimensions, then shipped to the site for erection.
Why it matters
Because a PEMB is engineered as a complete, integrated system by the manufacturer rather than designed independently by the project's structural engineer, changes to the building's dimensions or loading after the manufacturer's engineering is finalized can require the entire structural package to be re-engineered, not just a simple field adjustment.
On a real project
A warehouse owner orders a pre-engineered metal building sized and engineered by the manufacturer for the specific roof snow load and wind load at that site, with the entire steel frame, roof, and wall panel package manufactured as a coordinated kit and shipped for erection.
Who this matters most to
A Project Engineer coordinates the manufacturer's engineering submittals and shop drawings early, since a PEMB's long manufacturing lead time means design decisions have to be locked in well before erection. An Ironworker erects the steel frame following the manufacturer's specific erection drawings, which are often more prescriptive than a conventional structural steel erection sequence.
Where this goes wrong
A project team decides to add a mezzanine level to a pre-engineered metal building after the manufacturer's engineering package has already been finalized and fabrication has started. The added load requires the manufacturer to re-engineer and potentially re-fabricate structural components, creating a costly delay that a decision made earlier, before the engineering was locked in, would have avoided.