Quality concepts
Quality control (QC)
Also called: QC
Quality control is the boots-on-the-ground check: you walk the installed work, measure it, test it and compare it to the drawings, submittals and acceptance criteria. Where quality assurance is the system set up beforehand, QC is what you do to a specific piece of built work to confirm it passes. It produces the evidence — the measurements, the photos, the test results — that says this run of installed work either meets the spec or gets written up.
Why it matters
QC is where problems actually get found. A QA plan can be perfect on paper and work can still drift — the wrong fastener spacing, a slope that flattens out, a penetration nobody firestopped. QC is the inspection that catches it against the real thing.
It is also what turns a claim of quality into proof. A passed QC check with a timestamped photo tagged to the location is defensible; a verbal assurance is not.
How it shows up on site
Trade-specific inspection checklists run at rough-in and final, measurements taken and recorded, and any failed item written up as a nonconformance instead of quietly waved through.
Checklists that put quality control (qc) to work
Free, field-ready checklists, each with the photo every item needs before it can be submitted.
Related terms
- Quality assurance (QA)The planned system of procedures, plans and checkpoints set up before work starts so the right result is built the first time.
- Nonconformance report (NCR)A formal record raised when installed work does not meet the drawings, specs or an accepted standard, and the plan to resolve it.
- Acceptance criteriaThe stated, measurable conditions installed work has to meet before it can pass — the yardstick an inspection judges against.
- DefectA flaw in materials or workmanship that makes the work fall short of what was specified or of accepted trade practice.
- NonconformanceInstalled work that does not meet the drawings, spec or accepted submittal — formally identified so it gets dispositioned, not ignored.
- DeficiencyWork that is incomplete, missing or not up to standard — the catch-all a punch list and inspections use for anything that still needs attention.
Knowing the term is step one. Proving it is the job.
RTI holds the submit button until every mandatory item is answered and the photos are attached, then chains the record so it can be proven untouched later.