A structural steel fabricator acting as the prime contractor is responsible for delivering a complete cert package — but 30 to 40 percent of the work may be subcontracted. Surface treatment, galvanizing, NDE, specialty welding. Each subcontractor has their own cert trail. Final inspection requires the prime to produce a unified package that covers all of it.
This is operationally harder than managing certs for your own shop work, because you don't control when the subs generate their documentation or in what format they deliver it.
The Multi-Tier Cert Chain for Structural Work
A typical structural steel project produces documentation from multiple sources:
Steel mill: Mill test reports (MTCs) for all base material — the foundation cert for every piece of steel on the job.
Fabricator (prime): Assembly records, fit-up records, WPS/PQR documentation, welder qualification records, weld maps with heat number and filler material references.
NDE subcontractor: RT, UT, MT, or PT reports referencing specific joint numbers and acceptance results.
Surface treatment subcontractor: Coating records documenting coating system, application method, DFT (dry film thickness) measurements, and holiday test results. Required for compliance with SSPC, NACE, and project specifications.
Galvanizer: Galvanizing cert documenting zinc bath chemistry, bath temperature, coating thickness measurements, and compliance with ASTM A123 or A153. A process cert, not a material cert — frequently missing from structural packages.
Hardware supplier: Bolt assembly certs (ASTM F3125 grade A325 or A490), nut certs, washer certs. Required for each lot of fasteners used on the project.
A complete package for a structural steel job contains all of these. Final inspection that discovers any of them is missing will not accept the shipment until the gap is resolved.
Where the Chain Breaks
Each subcontractor delivers their documentation in their own format, on their own timeline, driven by their own administrative processes.
Some subs email PDFs within a week of job completion. Some send physical documents by mail. Some have to be chased by the fabricator's QA team with follow-up calls. The prime's QA team assembles the final package under shipment deadline pressure, often discovering gaps two days before the inspector arrives.
At that point, options are limited. If the NDE subcontractor's report for a specific joint is missing, the inspection stops until the report is produced. If the galvanizer's cert can't be located, the galvanizing job may have to be reverified by measurement.
The gap isn't a documentation failure in isolation — it's a project management failure that shows up as a documentation failure at the worst possible time.
Building a Cert Collection Process That Works
Include cert delivery requirements in every subcontract. The subcontract should specify: the format of documentation required (digital PDF, physical copy, or both), the content required (specific fields, reference numbers, acceptance criteria), and the delivery deadline (X days before scheduled final inspection, not "at job completion").
Assign a cert tracking log to each project. One row per subcontractor per deliverable. The log tracks: what's required, what's been received, what's outstanding, and the follow-up status. This log is reviewed at regular intervals during the project — not only at the end.
Check cert completeness at job midpoint, not at job close. If the NDE sub is scheduled to complete work in week 6 of a 12-week project, the NDE reports should be in hand by week 8. A midpoint check catches delays while there's still time to resolve them.
Gate final inspection on cert package completeness. Final inspection doesn't get scheduled until the cert package is complete. This is the only rule that prevents the "missing cert discovered at inspection" scenario — and it requires discipline to enforce when schedule pressure is high.
The Galvanizing Cert Gap
Galvanizing is frequently the missing cert in structural packages, for a specific reason: galvanizing is operationally treated as a finishing operation, not a quality-controlled manufacturing process. The fabricator sends the steel to the galvanizer, gets it back with a coating, and moves to final inspection. The galvanizing cert is an afterthought.
ASTM A123 (for structural shapes and plates) and ASTM A153 (for fasteners) both require documentation that the coating meets the standard's requirements for zinc coating weight and thickness. The galvanizer's cert documents zinc bath chemistry and coating measurements — it's the only evidence that the ASTM A123 or A153 requirement was met.
Without it, the fabricator has no documented basis for claiming ASTM A123 compliance. For a project that specifies galvanizing to ASTM A123, that's a specification gap in the final documentation package.