First, describe the work and worksite
A glazing maintenance crew will remove and renew deteriorated nonstructural weatherseal and backer at a sound ground-level storefront perimeter joint. The pane and its mechanical or structural retention remain intact; no glass is removed. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- A responsible glazing specialist identifies the joint as nonstructural and releases the existing glass and frame condition.
- The specified replacement sealant, backer, primer and cleaning products are compatible with the actual substrates and old material.
- Structural silicone, unknown coatings, glass removal, frame anchorage changes and elevated facade access are excluded.
Questions before work
- What confirms the seal being removed is not part of glass retention?
- Which preparation and compatibility requirements apply to the existing joint?
- How will weather exposure and access be managed while the joint is open?
Build the analysis one step at a time
What will the worker do? How could someone be harmed? What prevents or reduces that exposure? Who checks the control, and when?
1. Identify and release the joint
Hazard: Removing a retention seal or disturbing damaged glazing can cause glass movement.
Control: Glazing specialist identifies the joint function and confirms sound retained glass and frame. Compare the repair scope with current details; stop if structural retention, unknown condition or another seal system is involved.
Verification: Lead records joint identity and the maintenance boundary before cutting.
Why this belongs in the analysis: An exposed bead does not reveal its structural function.
2. Prepare access and chemical controls
Hazard: Occupants, sharp tools or vapors can expose people around an active opening.
Control: Close the work area, establish suitable low-level access and arrange product-specific ventilation and ignition controls. Make labels and SDS available and select assessed hand/eye protection; protect occupied areas from debris and uncured products.
Verification: Foreperson checks access, product identity and the affected indoor/outdoor spaces.
Why this belongs in the analysis: A small perimeter repair still creates a public and chemical interface.
3. Remove the old weatherseal
Hazard: A blade can cut hands or damage the retained glass edge and frame.
Control: Use suitable controlled cutting and removal tools from stable positions. Keep hands outside blade paths and preserve the retained glazing system; collect old seal and backer without scraping through an unidentified coating or levering against glass.
Verification: Assigned installer observes substrate condition as removal exposes the joint.
Why this belongs in the analysis: Unexpected material or damage changes the repair boundary.
4. Prepare the released surfaces
Hazard: Incompatible cleaner or remaining material can damage substrates or defeat adhesion.
Control: Follow the selected system’s preparation and required compatibility/adhesion checks for the actual joint. Use the specified backer and bond-breaker arrangement without blocking drainage; hold repair where clean, sound surfaces cannot be established.
Verification: Installer documents actual preparation and required test findings.
Why this belongs in the analysis: A filled joint can conceal unresolved adhesion or drainage problems.
5. Apply and protect the replacement seal
Hazard: Incorrect joint geometry or access during cure can leave a defective weatherseal.
Control: Apply primer and sealant only as specified for the actual conditions and joint geometry. Tool from controlled positions, preserve movement accommodation and protect the uncured work from contact and unsuitable weather; stop for conditions outside instructions.
Verification: Glazing lead checks completed joint details and cure restrictions.
Why this belongs in the analysis: Sealant choice alone does not establish a functioning movement joint.
6. Hand over the repaired perimeter
Hazard: Uncommunicated cure limits or hidden glass damage can expose later users.
Control: Complete the designated repair inspection, clean tools and manage chemical waste under the site process. Transfer joint identity, remaining cure restrictions and observed glazing findings to the building contact; refer retention concerns for separate review.
Verification: Receiving contact confirms repair status and unresolved actions.
Why this belongs in the analysis: Weatherseal renewal is not structural-glazing acceptance.
What does a useful control look like?
| Needs improvement | More useful for this scenario |
|---|---|
| Work carefully and wear PPE. | Use suitable controlled cutting and removal tools from stable positions. Keep hands outside blade paths and preserve the retained glazing system; collect old seal and backer without scraping through an unidentified coating or levering against glass. |
| Check that everything is ready. | Glazing specialist identifies the joint function and confirms sound retained glass and frame. Compare the repair scope with current details; stop if structural retention, unknown condition or another seal system is involved. |
Decisions that change the analysis
Can this be used to replace a structural silicone bond?
No. Structural glazing needs its own design, product qualification, glazing support, testing and release process. Stop when the joint carries retention or its function cannot be established; this example covers nonstructural weathersealing only.
What must the crew record for actual use?
Identify the actual equipment and work boundaries, responsible people, applicable criteria, inspection findings and open actions. Resolve changes with affected crews and obtain required project authorization before work.
Agree when the crew will pause
- Joint function is uncertain or retention/glass damage is found.
- Unknown coating, incompatible products or failed preparation findings.
- Access, ventilation, drainage or curing weather cannot be maintained.
After a pause, correct the condition, reassess the work, and obtain required authorization before restarting. Keep unresolved actions visible.
Download the worked example and free template
No account or paid membership required. The worked example contains planned controls. The blank template is for your own work; neither includes fabricated inspection results, signatures or approval.
Your editable working copy
Build and download your draft
Start blank or load the learning example. Replace its assumptions with your actual conditions and involve the people doing the work. Your entries stay in this browser tab; download a copy before leaving or refreshing.
1. Describe your work and site
2. Work through each task
Describe an observable step, how someone could be harmed, and the control that acts on that hazard. Identify who checks it and what evidence is needed.
3. Record changes, checks, and open actions
Walk the work area, review with the crew, and resolve missing controls. Follow the required approval process. This tool does not judge completeness, verify signatures or authorize work.
Open the downloaded file in a browser, then use Print → Save as PDF for a printable copy.
Training needs to confirm
- Joint-function identification, controlled removal and actual weatherseal preparation/acceptance instruction.
- Chemical hazard communication, ventilation and sharp-tool handling for the selected products.
Confirm applicable qualifications, task instruction and actual training evidence for the people assigned. Related toolbox talks support crew discussion; they do not establish competence.
Common questions
Can this example be used as a JSA?
Adapt its Task | Hazard | Control analysis to the employer’s format and actual conditions. The example is a teaching aid, not evidence that controls were checked.
What changes if the project requires an AHA?
Use the governing AHA format, risk method, supporting records and acceptance process. The published formwork AHA demonstrates that additional structure; changing a JHA title does not supply it.
Are these resources part of a paid course?
This walkthrough, browser draft builder and downloads are free public resources, separate from Academy course enrollment.
References and source note
- Dow Construction Sealants Technical Manual: weatherseal replacement
- OSHA 1910.1200 Hazard communication
- OSHA 1926.300 Hand and power tools
Original instructional scenario with planned controls. Primary references support hazard planning. Use actual equipment and product instructions, project design and employer requirements to establish field criteria. Use actual equipment instructions and site requirements alongside these references. Reference review: October 9, 2026.