JHA / JSA / AHA builderMasonry Work From a Mast Climber JHA
A JHA breaks the work into steps, hazards and controls. Use this example to build a draft for your actual job and review it with your crew.
Just need the example? Download it here.For the crew
You know the work. Let’s turn that experience into a plan your crew can talk through. Start with today’s job, then check the steps together.
Let’s build your JHA.
Step 1 of 4 · Working draft
Your job
Tell Jenkins what you’re planning and where the work will happen. Use the actual job details.
Use the published example’s suggestions when they fit your task, or write your own steps. These are planned controls, not verified worksite conditions.
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.
Walk through the plan with the people doing the work. Resolve missing controls and agree who checks them. Moving to the next step does not approve the work.
Confirm people, equipment and emergency arrangements
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.
Print your own JHA by signing in, or contribute the selected structured categories as a guest. Signing in does not require research participation. Written job details are processed to prepare your export and are stored on our server only if you save to your private company library.
Research purpose, data fields, retention and withdrawal · Privacy notice
Sign-in uses a free account. Your tab draft is retained for the return from sign-in.
Hosted organization saving requires active jSMS access and a company workspace. View jSMS plans.
The export uses landscape pages, task-only continuation pages and a Page X of Y footer in current Chrome or Edge. Review every page. Opening an export is not proof that the JHA was printed or used. The PDF includes its research choice and reference; the private withdrawal link stays in the export’s screen-only receipt.
Device storage and other draft options
Device copies may contain private job information. Clear them when using a shared device.
Your entries stay in this working draft as you move between steps. Required field checks, employer review and work authorization remain separate.
Your Masonry Work From a Mast Climber JHA
Walk through the job in order. Use these possible hazards, planned controls and checks to start a conversation about your actual work.
011. Accept the platform handover
Possible hazards: An incomplete installation or unsuitable support can cause collapse.
Planned controls: Masonry lead and competent person confirm the configuration, support, mast ties and handover documentation. Obtain the supplier’s operating and load instructions; keep use on hold for unresolved installation findings.
Check before work: Competent person records the pre-use inspection for the actual configuration.
022. Load within the chart
Possible hazards: Concentrated block or mortar loads can overload the platform or its extensions.
Planned controls: Place stock only in the chart’s permitted zones and account for workers, tools and mortar. Coordinate loading with the operator; do not infer equal capacity across platform sections.
Check before work: Operator checks total load and its distribution before movement.
033. Check gates and travel clearance
Possible hazards: An open loading gate or obstruction can cause a fall or crushing during travel.
Planned controls: Close required protection, clear the complete travel path and use the specified gate and interlock arrangement. Keep workers away from the building/platform pinch zone and retain protection during loading transitions.
Check before work: Operator verifies gates, travel route and people’s positions before motion.
044. Raise and work at the selected level
Possible hazards: Unexpected motion, dropped stock or reaching beyond protection can injure workers.
Planned controls: Authorized operator moves the platform under its instructions and agreed communication. Work at the suitable height with protection intact; restrain materials and maintain the exclusion zone below.
Check before work: Operator and masonry lead monitor platform response and work positions.
055. Respond to faults and weather
Possible hazards: A stalled platform, failed control or excessive wind can strand or expose the crew.
Planned controls: Stop for abnormal movement or limits exceeded. Use the prescribed emergency lowering and rescue arrangements with trained roles; do not defeat interlocks, improvise climbing or alter mast ties to restore use.
Check before work: Operator communicates the fault and competent person determines the release needed.
066. Park and hand over
Possible hazards: Unsecured stock or unreported faults can expose another shift.
Planned controls: Park in the instructed position, secure against unauthorized use and weather, and transfer load and defect status. Keep defective equipment unavailable pending proper correction and release.
Check before work: Outgoing lead confirms platform and stock condition at handover.
Example scope and starting conditions
A masonry crew will use a handed-over twin-mast climbing work platform to build a released exterior masonry wall. The equipment supplier’s approved configuration governs platform loads and travel. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- The foundation, mast ties, platform arrangement, load chart and emergency descent method are established for this installation.
- Authorized operators and users work within the approved guardrail and loading arrangement.
- Erection, dismantling, mast-tie alteration and rescue by untrained personnel are excluded.
Know when to pause
- Missing handover, damaged mast/tie or uncertain load distribution.
- Open protection, travel obstruction or abnormal controls.
- Weather limits, fault response or emergency descent arrangements change.
After a pause, correct the condition, reassess the work, and obtain required authorization before restarting.
Free example and template
No account required. The worked example contains planned controls. The blank template is for your own work; neither includes fabricated inspection results, signatures or approval.
Worked exampleNeed help? Ask Jenkins
Jenkins · Your Safety Concierge
What brings you here today? Choose what you’re working on, or tell Jenkins about your situation.
Jenkins matches your words to published starting points. Keep names and private job details in your working draft. Suitable free resources come first.
For managers
Does the team have what it needs to carry out the plan? Give the crew time, equipment and support, and make it clear who will resolve anything that is missing.
Manager checks and supporting resources
Confirm the people doing the work have the time, equipment, information and support to carry out the plan. Agree who checks the controls and who resolves open actions.
Questions to resolve before work
- Where does the configuration-specific chart permit masonry stock and people?
- Who inspects the platform before each shift and after relevant changes?
- How will a fault, power loss or medical emergency be managed at height?
Training and qualifications to confirm
- Mast-climber model and installation-specific operator/user instruction, including emergency descent.
- Scaffold role training, chart-based masonry loading and falling-object controls.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
May the crew shift a mast tie to reach a wall detail?
No. Mast ties are part of the installation’s stability system. Any alteration requires the authorized design, specialist procedure, inspection and new use release; this user-work analysis does not cover that change.
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.
Keep planning connected
Resources that support this JHA
Additional tools for task planning and safe work. Start with the free resources; explore paid options only when they meet an additional need.
Toolbox talks for the work
Prepare a practical crew discussion.
Scaffolds: Verify Readiness Before Access →Manual Handling: Change the Lift Before You Lift →Severe Weather: Know When and Where to Shelter →Mast Climbers: Check Load, Travel and Readiness →
Safety program resources
Review procedures, roles, and requirements.
Browse the existing catalog and confirm the scope and purchase availability of each program.
Browse safety programs →
Paid service · Availability
Task-specific training and qualifications
Explore applicable training and qualification needs.
Task-specific training services are not currently available to book here. Start with the free training-needs lookup; a toolbox talk or online course alone does not establish competence or employer authorization.
Review training needs · Free →People, equipment, emergency arrangements and open actions are recorded in the guided JHA’s Crew review step.
Open the crew review step →For safety professionals
How do we know the planning process and controls are working? Connect what the crew reports with field checks, risk decisions and the evidence behind your system.
Industry context, SIF, control verification and AHA review
Guidance and evidence
Review the method, risk decisions and evidence behind the plan. Use the actual jurisdiction, equipment instructions, employer process and project requirements.
Task-by-task control and verification rationale
1. Accept the platform handover
Hazard: An incomplete installation or unsuitable support can cause collapse.
Control: Masonry lead and competent person confirm the configuration, support, mast ties and handover documentation. Obtain the supplier’s operating and load instructions; keep use on hold for unresolved installation findings.
Verification: Competent person records the pre-use inspection for the actual configuration.
Why this belongs in the analysis: A standard frame-scaffold handover does not describe a powered mast platform.
2. Load within the chart
Hazard: Concentrated block or mortar loads can overload the platform or its extensions.
Control: Place stock only in the chart’s permitted zones and account for workers, tools and mortar. Coordinate loading with the operator; do not infer equal capacity across platform sections.
Verification: Operator checks total load and its distribution before movement.
Why this belongs in the analysis: Load placement matters as well as total weight.
3. Check gates and travel clearance
Hazard: An open loading gate or obstruction can cause a fall or crushing during travel.
Control: Close required protection, clear the complete travel path and use the specified gate and interlock arrangement. Keep workers away from the building/platform pinch zone and retain protection during loading transitions.
Verification: Operator verifies gates, travel route and people’s positions before motion.
Why this belongs in the analysis: A stationary working gap becomes a moving crush zone.
4. Raise and work at the selected level
Hazard: Unexpected motion, dropped stock or reaching beyond protection can injure workers.
Control: Authorized operator moves the platform under its instructions and agreed communication. Work at the suitable height with protection intact; restrain materials and maintain the exclusion zone below.
Verification: Operator and masonry lead monitor platform response and work positions.
Why this belongs in the analysis: Positioning the platform can reduce reaching without changing its approved configuration.
5. Respond to faults and weather
Hazard: A stalled platform, failed control or excessive wind can strand or expose the crew.
Control: Stop for abnormal movement or limits exceeded. Use the prescribed emergency lowering and rescue arrangements with trained roles; do not defeat interlocks, improvise climbing or alter mast ties to restore use.
Verification: Operator communicates the fault and competent person determines the release needed.
Why this belongs in the analysis: Fault recovery is a separate equipment procedure.
6. Park and hand over
Hazard: Unsecured stock or unreported faults can expose another shift.
Control: Park in the instructed position, secure against unauthorized use and weather, and transfer load and defect status. Keep defective equipment unavailable pending proper correction and release.
Verification: Outgoing lead confirms platform and stock condition at handover.
Why this belongs in the analysis: Shift close must preserve the next crew’s configuration knowledge.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| Work carefully and wear PPE. | Close required protection, clear the complete travel path and use the specified gate and interlock arrangement. Keep workers away from the building/platform pinch zone and retain protection during loading transitions. |
| Check that everything is ready. | Masonry lead and competent person confirm the configuration, support, mast ties and handover documentation. Obtain the supplier’s operating and load instructions; keep use on hold for unresolved installation findings. |
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
- OSHA Mast climbers scaffold guidance
- OSHA 1926.451 Scaffold requirements
- OSHA 1926.454 Scaffold training
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.
Developed by Todd Jerome Jenkins, MS, CSP · Edition v1.0 · October 9, 2026
Use the builder’s Print / Save as PDF action after signing in or accepting research participation.