Test façade mock-up for interstory drift accommodation and recovery guides QA teams through planning, instrumenting, cycling, and documenting racking tests on curtain wall assemblies to verify movement capacity and self-recovery.
- Define drift ratios, cycle protocol, and measurable recovery criteria upfront.
- Instrument mock-up with calibrated displacement sensors and synchronized data logging.
- Execute controlled racking cycles; capture damage, residual offsets, and evidence.
- Interactive, commentable, export-ready checklist with QR code authentication.
The checklist
Pre-Test Documentation & Setup
- Upload approved protocol and define test responsibilities.
- Confirm drift ratios (serviceability and ultimate) per approved project specifications and authority requirements; record target ratios (e.g., ±1.5% and ±2.5%) and corresponding lateral displacements in millimetres.
- Verify mock-up frame and strong floor capacity; attach engineer sign-off and photographic evidence of reaction frame anchors and torque markings.
- Hold pre-test briefing covering safety zones, stop criteria, and communication; record attendee signatures and emergency stop (E-stop) locations.
Instrumentation & Calibration
- Install LVDTs or laser displacement sensors at drift control points; verify sensor range exceeds 120% of peak displacement; upload installation photos.
- Calibrate displacement sensors to ±0.5 mm or better using a traceable gauge block; attach calibration certificates and zero-offset readings.
- Set data logger sampling rate ≥10 Hz; verify time sync across devices to ±0.1 s; capture screenshot of configuration.
- Verify actuator stroke, load cell capacity, and rate control; document maximum planned drift speed (e.g., 10–20 mm/s) and perform dry-run to 25% target.
Mock-Up Assembly & Baseline Survey
- Confirm glazing, gaskets, anchors, and sealants are installed per shop drawings; record batch/lot numbers and curing times for sealants and gaskets.
- Measure baseline plumb, level, and joint gaps at critical locations with a steel rule/laser; log values (±1 mm) and upload photos with labels.
- Mark reference targets on mullions/transoms for visual tracking; apply non-residue tape with unique IDs; photograph each tag in situ.
- Inspect fastener torques with a calibrated torque wrench; record applied torques and witness-mark fasteners; upload torque tool certificate.
Test Execution: Drift Cycling
- Execute serviceability drift cycles to the first target ratio; hold at peak for 10–30 s; log peak displacement and actuator force vs. time.
- During peak displacement, inspect glazing bite and gasket seating using feeler gauges; record minimum bite (mm) and note any disengagement.
- Return to zero displacement; measure residual offsets at reference targets with a steel rule (±1 mm); record values and photos.
- Repeat bidirectional cycles per protocol (e.g., three cycles at each ratio); confirm rate control within ±10% of set speed.
- Advance to ultimate drift ratio if acceptance met and no stop criteria triggered; capture high-resolution video at ≥25 fps for critical joints.
Post-Test Inspection & Recovery
- After final cycle, allow a 10–15 min recovery period; re-measure plumb/level and joint gaps; record residual drift (mm and % of span).
- Inspect anchors, brackets, and slip details for permanent deformation or binding; capture close-up photos with scales and note free movement evidence.
- Check sealant and gasket continuity under magnification; note tears, cohesive/adhesive failures; tag locations on a damage map drawing.
- Verify operable elements (if included) cycle once post-test; record force-to-operate (N) and note rubbing or misalignment with photos.
Reporting & Sign-Off
- Export synchronized drift data (CSV) and embed photo/video references with timestamps; attach all calibration certificates and pre-test approvals.
- Complete acceptance checklist against criteria per approved project specifications and authority requirements; record pass/fail with justifications and signatures.
- Issue final report with QR-authenticated link to the evidence archive; distribute to client, designer, and contractor representatives.
Preview the printable checklist
Preview page one below. Open the image or download the PDF for all pages.
At a glance
- Plan, instrument, and execute a controlled racking protocol on a full-scale façade mock-up to verify movement capacity, residual drift, and component recovery, with measurable criteria and fully traceable calibrations to support project acceptance.
- Ensure consistent, high-quality evidence by synchronizing displacement data with time-stamped photos and technician sign-offs, capturing anchor slip, gasket response, glazing bite retention, and sealant continuity at each drift cycle and recovery interval.
- Interactive online checklist with tick, comment, and export features secured by QR code.
- Deliver a clean audit trail linking pre-test documents, calibration certificates, drift logs, damage mapping, and recovery measurements to final acceptance, enabling confident decisions per approved project specifications and authority requirements.
How to Prepare, Use, and Sign Off This Interactive Checklist
- Preparation: Gather protocol, shop drawings, calibrated sensors, torque tools, data logger, cameras, and PPE. Confirm strong floor availability, actuator capacity, and specimen readiness with documented approvals.
- Assign Roles: Add team members as collaborators, set due dates, and define approval workflows for instrumentation, execution, inspection, and reporting.
- Using the Interactive Checklist: Start interactive mode, tick items as completed, attach photos/videos and files, and add time-stamped comments at each step.
- Data Capture: Upload calibration certificates, drift logs (CSV), and measurement sheets. Use consistent naming and tag evidence to item IDs for traceability.
- Review: Filter any open comments, resolve conflicts, and verify all acceptance criteria are addressed before proceeding to sign-off.
- Sign-Off: Collect digital signatures from responsible parties. Generate a summary with pass/fail notes and embedded evidence links.
- Export & Archive: Export as PDF/Excel and share. Verify the QR authentication link opens the evidence archive for audit.
Define objectives, tolerances, and evidence before you rack the mock-up
Successful interstory drift testing starts with clarity on what to measure and what defines acceptance. Establish drift ratios for serviceability and ultimate conditions, then convert ratios to lateral displacements in millimetres using the mock-up’s clear height. Specify instrument accuracies, sampling rates, and actuator control limits to avoid data gaps and overshoot. Baseline surveys of plumb, level, and joint gaps set the reference for recovery checks. Document lot numbers and curing intervals for sealants and gaskets because premature testing skews outcomes. Calibrate all sensors and torque tools with traceable certificates, and synchronize timestamps across devices. Predetermine stop criteria for glass cracking, anchor yielding, or sealant tearing to protect the specimen and personnel. With these controls in place, teams minimize variability and produce evidence that withstands audit and peer review, aligning outcomes with the approved project specifications and authority requirements without relying on anecdotal judgments.
- Translate drift ratios into millimetres before test day.
- Set sensor accuracy to ±0.5 mm or better.
- Synchronize all devices to ±0.1 s time difference.
- Record sealant cure times and lot numbers.
- Agree stop criteria and communication signals.
Execute consistent drift cycles and capture synchronized, reviewable evidence
During racking, rate control and repeatability matter as much as reaching target drift. Use calibrated actuators to cycle to each target, hold briefly at peak, and return to zero while logging displacement and force. At peak drift, visually confirm glazing bite and gasket seating; small shifts can signal restraint issues or clip binding. After each cycle, measure residual offsets at marked references to quantify recovery. Keep the camera rolling for critical joints to correlate observed movements with the data log. Repeat bidirectional cycles as prescribed to reveal progressive slip or damage accumulation. Progress to ultimate drift only if serviceability acceptance is confirmed and stop criteria remain clear. Consistency in execution yields clean datasets and reduces the chance of misinterpreting transient behaviours as failures.
- Control drift rate within ±10% of set value.
- Hold 10–30 s at peak for observations.
- Measure residuals in mm after each cycle.
- Video record critical joints at ≥25 fps.
- Repeat symmetric cycles in both directions.
Assess recovery, document damage, and close the QA loop
Post-cycling, allow the mock-up time to relax before measurements. Re-survey plumb, level, and joint gaps, then compute residual drift as a percentage of the story height. Inspect anchors and slip details for free movement without galling, and check sealants and gaskets for tears, permanent set, or adhesion loss. Operable elements, if included, should function without binding and with acceptable operating force. Compile a damage map linked to timestamps, photographs, and measurement logs to present a coherent narrative of performance. Final acceptance compares measured residuals and observed conditions against the approved project specifications and authority requirements. The result is a defensible pass/fail decision supported by synchronized data, clear photos, and formal sign-offs.
- Allow 10–15 minutes for elastic recovery.
- Map all damage with coordinates and IDs.
- Quantify residual drift in mm and percent.
- Verify anchor slip paths remain uninhibited.
- Confirm seals and gaskets remain continuous.
