IGU Primary and Secondary Sealant Bead Inspection

It covers the perimeter seal checks that matter most for insulating glass unit quality: primary butyl bead continuity, bead width and thickness, secondary sealant continuity, profile, and corner workmanship. It also includes unit identification, access conditions, and closeout fields for non-conformances and disposition. The template is designed to document observable defects, not to replace lab testing or destructive validation. Use it as a production, receiving, or final QC inspection record.

Use it during in-process QC, final inspection before shipment, receiving inspection, or after a process change that could affect seal application. It is especially useful when you need to confirm that the sealant bead matches the approved standard or manufacturer specification. If the unit has already failed in service, this template can still support a visual condition assessment, but it will not diagnose all root causes. For field failure analysis, pair it with moisture, gas retention, or adhesion testing as needed.

A trained QC inspector, line lead, or competent person familiar with IGU construction should complete it. The person running the inspection should know the approved bead specification, the measuring method, and how to identify defects such as pull-back, voids, and uneven wet-out. If your process requires signoff authority, assign the template to the role that can hold or release product. The template works best when the inspector can compare the unit directly to the applicable standard or job specification.

This is primarily a quality control template, so it aligns more closely with customer specifications, manufacturer standards, and ISO 9001-style inspection records than with a single safety regulation. In practice, it supports documented verification of conformance, traceability, and corrective action. If your organization uses glazing or fenestration standards, you can map the checklist to those internal or industry requirements. It is not a substitute for code compliance review by the AHJ where building code issues apply.

A common mistake is checking only for presence of sealant instead of measuring bead width and thickness against the approved specification. Another is missing corner voids, pull-back, or thin spots because the inspection is rushed or the perimeter is not fully accessible. Teams also sometimes fail to record the exact location of a defect, which makes rework difficult. This template helps prevent those gaps by forcing location-based non-conformance recording and disposition.

Yes. The template is meant to be cloned and customized to your IGU design, sealant system, and customer requirements. You can add nominal bead dimensions, tolerance bands, photo fields, lot numbers, or cure-stage checks if your process needs them. If you inspect multiple product families, create separate versions so the criteria stay specific to each unit type. That reduces ambiguity and makes the inspection easier to train and audit.

An ad-hoc visual check usually catches only obvious defects and often leaves no usable record of what was found or where. This template turns the same walk-through into a repeatable inspection with measured criteria, defect location, and disposition tracking. That makes it easier to trend recurring issues like corner pull-back or inconsistent edge coverage. It also gives production and quality teams a shared record for corrective action.

Record the non-conformance with the exact perimeter location, the measured or observed deviation, and the severity. Then assign a disposition such as rework, hold, scrap, or engineering review based on your internal procedure. If the defect affects continuity, adhesion, or corner sealing, treat it as a higher-risk issue because it can affect long-term gas retention. The template is built to make that decision visible and traceable.