IGU Primary and Secondary Sealant Bead Inspection

Inspection template for verifying insulating glass unit (IGU) primary butyl and secondary sealant bead width, thickness, continuity, and corner workmanship around the perimeter to support long-term gas retention and quality control.

Inspection Details and Unit Identification

• IGU identification recorded
  Record unit ID, job number, lite size, spacer type, and inspection location.
• Manufacturer specification or approved standard available
  Verify the applicable sealant bead specification, drawing, or approved sample is available for comparison.
• Inspection method and measuring tools verified
  Confirm the inspector used the correct gauge, caliper, or visual reference method required by the work instruction.
• Unit orientation and perimeter access adequate
  Confirm all four edges and corners can be inspected without obstruction.

Primary Sealant Bead Inspection

• Primary butyl bead continuous around full perimeter
  Check for uninterrupted primary sealant coverage around all edges with no skips, voids, or breaks.
• Primary butyl bead width within specification
  Measure bead width at representative locations and compare to the approved specification.
• Primary butyl bead thickness within specification
  Measure bead thickness at representative locations and compare to the approved specification.
• Primary sealant adhesion and wet-out appear uniform
  Verify the primary sealant appears properly seated and bonded to the spacer and glass surfaces with no visible separation.

Secondary Sealant Bead Inspection

• Secondary sealant bead continuous around full perimeter
  Check for uninterrupted secondary sealant coverage around all edges with no gaps, skips, or open areas.
• Secondary sealant bead width within specification
  Measure bead width at representative locations and compare to the approved specification.
• Secondary sealant bead thickness within specification
  Measure bead thickness at representative locations and compare to the approved specification.
• Secondary sealant profile is smooth and fully tooled
  Verify the bead profile is uniform, without excessive ridges, pinholes, or untooled areas that could affect durability.

Corners, Edge Conditions, and Workmanship

• Corners fully sealed with no voids or pull-back
  Inspect all corners for complete sealant coverage, proper overlap, and no visible pull-back, fisheyes, or voids.
• Edge coverage consistent at all perimeter locations
  Verify sealant coverage is consistent along straight runs and transitions, with no thin spots or exposed spacer edges.
• Visible workmanship defects documented
  Select any observed defects that may affect long-term argon retention or seal integrity.

Closeout and Corrective Action

• Non-conformances recorded with location and severity
  Document each deficiency by edge, corner, and defect type so corrective action can be assigned.
• Disposition assigned
  Select the inspection disposition for the unit.
• Inspector signature completed
  Inspector signs to confirm the inspection was completed and findings are accurate.