QA vs. QC — Understanding the Difference

Quality Assurance and Quality Control get used interchangeably on site, but they’re different functions: QA is the planned system that prevents defects (procedures, ITPs, training); QC is the inspection and testing that confirms the work actually meets requirements.

• QA = process-focused, planned before work starts
• QC = inspection-focused, confirms the finished work
• Both are needed — one without the other leaves gaps

Rebar Inspection Before Concrete Placement

Rebar cover and spacing don’t get a second chance once concrete is placed. A pre-pour rebar check is worth verifying methodically, not from memory.

• Rebar spacing and placement match the approved drawings
• Concrete cover maintained per the project’s specified requirements
• Lap splices, embedments, and tie wire secured; area clean before pour

Cover and spacing values are project-specific — always verify against your approved drawings and specifications, not general guidance.

Pre-Pour Concrete Checks

Approving a pour involves more than confirming the truck arrived. A few checks at the point of discharge catch problems before the concrete is placed — not after.

• Delivery ticket matches the approved mix design
• Slump tested at discharge, within the approved range (ASTM C143)
• Cube/cylinder samples taken and logged per project sampling standard (ASTM C31/C39)
• Formwork inspected — stable, plumb, clean, no standing water

Hold Points vs. Witness Points

Mixing these up is how « we thought it was just a witness point » turns into rework. Every trade activity should have its Hold/Witness/Review points mapped before work starts, not figured out mid-pour.

• Hold Point — work stops until the inspector/engineer verifies and releases it
• Witness Point — inspector is notified and may attend, but work can proceed if they don’t
• Review Point — documentation is reviewed, doesn’t require a site visit

QOR vs. NCR — Which One Do You Need?

A Quality Observation Report (QOR) is the fast, field-level way to flag a concern the moment you see it. A Non-Conformance Report (NCR) is the formal record for work, material, or a process that fails to meet the specified requirement.

• QOR: quick log, recommended action, move on — before it needs an NCR
• NCR: Root Cause & Corrective Action, formal Disposition, verified close-out
• Rule of thumb: unresolved by target date, or serious from the start → escalate to NCR

QA/QC Documentation That Holds Up

Inspection records are only useful if they’re consistent, dated, and traceable back to the activity and the applicable requirement. Loose notes and undated photos are the first thing that falls apart at closeout.

• Every record ties back to a specific activity, location, and requirement
• Sign-off captures who inspected, when, and what was verified
• Open items tracked to close-out, not left in a separate notebook