Inspect fire-rated façade joint sealing at slab edges

The checklist

Documentation and Materials Verification

1. 1Confirm the installed joint design matches the approved tested assembly and project drawings; cross-check system ID, fire-resistance rating, and components. Evidence: photo of drawing mark-up, system ID on submittal, inspector initials and date.
2. 2Record product data sheets and lot/batch numbers for mineral wool safing, smoke/fire sealant, primers, and mechanical restraints. Evidence: label photos and entries in log; attach PDFs to the checklist.
3. 3Verify installer competency: check manufacturer training or project-approved qualifications. Evidence: photo of card/certificate and supervisor signature confirming trained personnel performed works.
4. 4Confirm required fire-resistance time equals or exceeds adjacent floor rating per approved project specifications and authority requirements. Evidence: submittal excerpt and inspector sign-off.

Joint Geometry and Substrate Condition

1. 5Measure slab edge-to-façade gap width every 2 m and at corners using a steel rule and feeler gauges; acceptance: within design width ±5 mm. Evidence: logged readings and location-tagged photos.
2. 6Check joint depth and spandrel zone dimension with a depth gauge; acceptance: depth meets or exceeds safing thickness requirement on drawings. Evidence: depth readings and sketch on photo.
3. 7Confirm substrates are sound, clean, and dry: vacuum dust; verify moisture ≤5% with a moisture meter before sealing. Evidence: moisture readings and photo of cleaned joint.
4. 8Verify support angles or closure plates (if specified) are installed; check anchor spacing ≤300 mm and torque per specification with a torque wrench. Evidence: spacing measurements, torque value, and photo.

Safing Insulation Installation

1. 9Confirm mineral wool type and density (e.g., 64–96 kg/m³) from labels; check thickness matches joint depth. Evidence: label photos and caliper/thickness gauge reading.
2. 10Install mineral wool with fibers perpendicular to the joint; verify uniform compression 25–50% using measured pre/post thickness. Evidence: before/after measurements and close-up photos.
3. 11Ensure tight butt joints between batts and at corners; gaps ≤3 mm. Fill any gaps with compressed mineral wool strips. Evidence: macro photos with scale.
4. 12Secure safing with impaling pins/clips where required; spacing ≤300 mm and edge distance ≥25 mm. Perform a light pull test ≥50 N. Evidence: spacing layout, pull reading, and photos.

Smoke/Fire Sealant Application

1. 13Apply smoke/fire sealant to the exposed face continuously; verify wet film thickness 6–12 mm (or per tested assembly) using a wet film gauge. Evidence: gauge readings and bead continuity photos.
2. 14Tool sealant to achieve 10 mm minimum bond to both substrates; perform a field cut/adhesion check (knife lift). Acceptance: cohesive failure preferred, no debonding. Evidence: test photo and note.
3. 15Seal around mullions, anchors, and brackets for continuity; no voids >2 mm. Where collars are specified, install per submittal. Evidence: detailed photos with arrows highlighting coverage.
4. 16Verify cure conditions: ambient temperature and RH within product limits; confirm tack-free time achieved before covering. Evidence: thermometer/hygrometer readings and timestamped photos.

Continuity, Protection, and Handover

1. 17Confirm continuity to adjacent rated walls, columns, and spandrel insulation; document transitions with annotated photos. Acceptance: uninterrupted fire/smoke barrier per approved project specifications.
2. 18Install temporary protection if finishes or glazing works follow; materials non-combustible and removable. Evidence: photo of protective measures and note on removal schedule.
3. 19Label completed segment with system ID, date, installer initials, gridline and level reference. Evidence: close-up photo of label and location overview.
4. 20Compile as-built record: measurements, photos, lot numbers, variance notes, corrective actions, and digital signatures (installer and inspector). Evidence: exported PDF/Excel and QR-linked archive confirmation.

Preview the printable checklist

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At a glance

• Validate that the perimeter fire barrier at slab edges follows the approved tested assembly, with correct mineral wool density, compression, and sealant geometry. Confirm continuity across slab edges, mullions, anchors, and transitions to rated walls, producing photo-backed, measurement-based evidence for formal acceptance.
• Control tolerances that drive performance: gap width uniformity, safing thickness versus joint depth, 25–50% mineral wool compression, sealant depth and width, and secure mechanical restraints. These measurable checks reduce rework, maintain rating continuity, and ensure movement and deflection compatibility under building service conditions.
• Interactive online checklist with tick, comment, and export features secured by QR code. Use it to capture photo evidence, lot numbers, and signatures per location, and to streamline approvals and handover with traceable records linked to gridlines and levels. Include notes on variances and corrective actions.
• Standardize inspections across trades and floors by aligning each segment to gridlines and elevations. Reference drawings and approvals, verify installer qualifications, and check cure conditions and protection. Create a verifiable audit trail that supports compliance with approved project specifications and authority requirements.

How to Use This Interactive Inspection Checklist

1. Preparation: review approved drawings and tested system submittals; assemble tools (steel rule, feeler gauges, depth gauge, wet film gauge, torque wrench, hygrometer/thermometer, moisture meter, camera/phone, flashlight); ensure PPE (gloves, safety glasses, hard hat, hi-vis).
2. Set up locations: organize segments by gridlines and levels; prefill target gap widths, safing thickness, and sealant geometry from drawings to speed field entries.
3. Using the Interactive Checklist: start interactive mode, select the location, tick items as completed, and attach annotated photos and measurements. Add comments for variances and link corrective actions.
4. Capture evidence live: record lot numbers, installer credentials, and environmental readings. Use the wet film gauge and depth gauge, then log values directly into the step fields.
5. Issue tracking: flag nonconformances, assign actions, and set due dates. Reinspect the same location and close items with before/after photos and notes.
6. Export and distribution: export as PDF/Excel with embedded photos; share with the contractor, consultant, and authority representatives for review.
7. Sign-Off and Archiving: capture digital signatures from installer and inspector; generate a QR code linking to the archived record for future verification.

Approved Systems, Materials, and Evidence That Withstands Audit

Start by confirming the installed perimeter fire barrier matches the approved, tested assembly shown on project drawings. Capture the system ID, fire-resistance duration, and the specific combination of mineral wool safing, smoke/fire sealant, primers, and mechanical restraints. Photograph packaging labels and record lot numbers to enable traceability across floors. Mineral wool typically requires a density in the 64–96 kg/m³ range; thickness must meet or exceed the joint depth. Sealants must be compatible with adjacent substrates and the mineral wool facing. Where foil-faced spandrel insulation is present, verify correct orientation and surface preparation before sealing. Acceptance cues are tangible: documented submittals, labels, marked-up drawings, and inspector initials on captured images. Real jobsite wins come from early verification: stopping nonconforming batches before installation, and aligning all trades on the exact tested detail—especially at corners, around mullions, and near anchors—so subsequent checks focus on measurable tolerances rather than design ambiguity.

• Match installed system to approved tested assembly.
• Photograph labels and record lot numbers.
• Verify mineral wool density and thickness.
• Check sealant compatibility and primers.
• Annotate drawings and photos for traceability.

Geometry, Compression, and Mechanical Restraint Drive Performance

Gap width and depth govern compression, sealant thickness, and ultimately fire/smoke performance. Measure the slab edge-to-façade gap every 2 m, including corners and changes in geometry. Target 25–50% compression of mineral wool with fibers perpendicular to the joint, and tight butt joints with gaps ≤3 mm. Verify support angles or closure plates are installed where required, with anchors at or below spacing limits and tightened per specification. If impaling pins are used, maintain spacing around 300 mm and ensure edge distances are not compromised. Continuity around mullions, anchors, and brackets must be inspected closely; add collars or detailed sealing as per the submittal. Movement allowances should remain free and unobstructed after installation. By locking down these measurable parameters, you can ensure consistent performance and reduce rework that stems from geometry drift or insufficient restraint.

• Measure gap width on a 2 m grid.
• Achieve 25–50% mineral wool compression.
• Limit butt-joint gaps to ≤3 mm.
• Confirm anchors and pins spacing.
• Maintain movement clearances at interfaces.

Sealant Quality, Curing, and Durable Continuity at Slab Edges

Apply smoke/fire sealant continuously on the exposed face to the specified depth and width; verify with a wet film gauge. Tool the bead to develop full adhesion to both substrates, then perform a simple cut/adhesion check—prefer cohesive failure with no debonding. Ensure temperature and humidity fall within product limits, and confirm tack-free condition before covering or loading adjacent works. Pay special attention to terminations at columns, transitions to rated partitions, and areas shadowed by façade brackets. Where protection is required, use non-combustible temporary covers and schedule removal to avoid damaging the seal. Close the loop with labeling, photo documentation, as-built measurements, and signatures, all tied to gridlines and levels for fast retrieval during audits or authority inspections.

• Verify sealant depth with a wet film gauge.
• Tool for two-sided adhesion and cohesion.
• Check cure within product limits.
• Seal around mullions and anchors.
• Label, photograph, and sign off locations.