JHA / JSA / AHA builderPowered Roof Ballast Removal 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.
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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.
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Your Powered Roof Ballast Removal JHA
Walk through the job in order. Use these possible hazards, planned controls and checks to start a conversation about your actual work.
011. Release roof zones and the material assessment
Possible hazards: Removing ballast can change membrane restraint; an unidentified aggregate or roof layer can introduce harmful dust.
Planned controls: Review the roof assembly, material assessment and approved zone sequence. Resolve dust and hazardous-material controls, support capacity, wind limits and temporary restraint before disturbing aggregate.
Check before work: Supervisor records the removal and restraint plan and the released materials and roof conditions.
022. Stage the vacuum and collection area
Possible hazards: Ground equipment or discharge can strike bystanders, obstruct access or expose people to airborne waste.
Planned controls: Place and secure the selected machine on the accepted ground location. Close its operating and discharge zones, control traffic and emissions, and prepare compatible collection equipment and the planned waste destination.
Check before work: Operator verifies machine setup, guarding and ground-area controls before the roof hose is connected.
033. Install the supported hose route
Possible hazards: An unsupported hose can fall, pull workers toward an edge or damage roof details.
Planned controls: Use the specified compatible hose and connections. Support and secure the route using the accepted arrangement, protect edges and maintain clear access; keep workers within protected positions during routing.
Check before work: Crew verifies connection condition, restraint and the actual roof-to-ground path before startup.
044. Remove aggregate in the released sequence
Possible hazards: Moving hose and suction can injure handlers; excessive removal can expose an unrestrained membrane.
Planned controls: Operate on agreed commands and maintain the instructed nozzle handling position. Work only in released zones with the required dust controls, track roof conditions and apply the approved restraint sequence as ballast is removed.
Check before work: Roof lead monitors zone progress, hose control and membrane restraint while the operator monitors machine limits.
055. Stop and isolate before clearing or discharge
Possible hazards: Stored energy, unexpected suction or moving equipment can injure people handling a blockage or collected waste.
Planned controls: Stop extraction on the agreed signal and follow the actual shutdown and energy-isolation procedure. Verify the required safe condition before opening connections, clearing a blockage or discharging collection equipment; use no improvised pressurized clearing.
Check before work: Authorized operator confirms isolation and clearance of affected people before the prescribed intervention.
066. Inspect and hand over the prepared roof
Possible hazards: Unrecorded membrane damage or incomplete restraint can leave a vulnerable roof after the machine is removed.
Planned controls: Inspect the removed zones, retain the approved temporary restraint and document damage and remaining ballast. Isolate and remove hose by the accepted route, clear waste and hand over the exact roof status before any separate tear-off.
Check before work: Supervisor records zone condition, restraint and open repair or demolition actions for the receiving crew.
Example scope and starting conditions
A trained vacuum crew removes selected roof aggregate from an accepted ballasted low-slope roof using a ground-positioned industrial vacuum and a controlled roof hose. The removal zones, roof loading and temporary membrane-restraint plan are approved; membrane tear-off is separately planned. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- Partial roof tear-off and cleanup coverage: industrial-vacuum aggregate removal and its handoff only; no membrane cutting, pressure-blowback clearing or structural deck repair.
- The selected machine instructions and material assessment govern hose equipment, dust control, operating limits, isolation and collection discharge.
- Accepted ground staging, protected roof access and edges, a supported hose route and the approved wind and membrane-restraint sequence are available.
Know when to pause
- Pause for unassessed material, missing roof or restraint acceptance, unsafe wind or loss of edge protection.
- Stop for hose movement, damaged connections, failed dust controls, membrane movement or unexpected equipment behavior.
- Blockage, discharge, machine changes or membrane tear-off require the actual authorized procedure and revised work boundaries.
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
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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
- Who approves the removal zones and temporary restraint as the ballast holding the membrane is taken away?
- How is hose weight and movement supported without damaging an edge or overloading roof areas?
- What stops extraction, isolates the machine and keeps people clear during a blockage or collection discharge?
Training and qualifications to confirm
- Verify selected-vacuum operator instruction, compatible hose setup, shutdown, blockage and discharge procedures and roof-to-ground communication.
- Train the roof crew on the approved ballast-removal and temporary-restraint sequence, material exposures and protected hose-handling positions.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
Why does the existing low-slope tear-off resource not cover this task?
That example removes released membrane and insulation sections. Here a ground vacuum, supported hose route, aggregate collection and progressive loss of ballast restraint create a separate equipment and roof-stability workflow before tear-off.
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.
Fall Prevention: Verify the Controls →Silica: Verify Dust Controls Before Cutting →Energy Isolation: Verify Before Servicing →
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. Release roof zones and the material assessment
Hazard: Removing ballast can change membrane restraint; an unidentified aggregate or roof layer can introduce harmful dust.
Control: Review the roof assembly, material assessment and approved zone sequence. Resolve dust and hazardous-material controls, support capacity, wind limits and temporary restraint before disturbing aggregate.
Verification: Supervisor records the removal and restraint plan and the released materials and roof conditions.
Why this belongs in the analysis: The stones are part of the roof system, so their removal can affect more than surface housekeeping.
2. Stage the vacuum and collection area
Hazard: Ground equipment or discharge can strike bystanders, obstruct access or expose people to airborne waste.
Control: Place and secure the selected machine on the accepted ground location. Close its operating and discharge zones, control traffic and emissions, and prepare compatible collection equipment and the planned waste destination.
Verification: Operator verifies machine setup, guarding and ground-area controls before the roof hose is connected.
Why this belongs in the analysis: A clear roof work area does not control the separate hazards around the ground machine.
3. Install the supported hose route
Hazard: An unsupported hose can fall, pull workers toward an edge or damage roof details.
Control: Use the specified compatible hose and connections. Support and secure the route using the accepted arrangement, protect edges and maintain clear access; keep workers within protected positions during routing.
Verification: Crew verifies connection condition, restraint and the actual roof-to-ground path before startup.
Why this belongs in the analysis: The long hose carries weight and movement that must not be resisted by a worker standing at an edge.
4. Remove aggregate in the released sequence
Hazard: Moving hose and suction can injure handlers; excessive removal can expose an unrestrained membrane.
Control: Operate on agreed commands and maintain the instructed nozzle handling position. Work only in released zones with the required dust controls, track roof conditions and apply the approved restraint sequence as ballast is removed.
Verification: Roof lead monitors zone progress, hose control and membrane restraint while the operator monitors machine limits.
Why this belongs in the analysis: Removal progress and roof stability must be reviewed together rather than treating extraction as unrestricted cleanup.
5. Stop and isolate before clearing or discharge
Hazard: Stored energy, unexpected suction or moving equipment can injure people handling a blockage or collected waste.
Control: Stop extraction on the agreed signal and follow the actual shutdown and energy-isolation procedure. Verify the required safe condition before opening connections, clearing a blockage or discharging collection equipment; use no improvised pressurized clearing.
Verification: Authorized operator confirms isolation and clearance of affected people before the prescribed intervention.
Why this belongs in the analysis: A blocked hose is an equipment problem requiring a controlled intervention, not a reason to improvise at the roof edge.
6. Inspect and hand over the prepared roof
Hazard: Unrecorded membrane damage or incomplete restraint can leave a vulnerable roof after the machine is removed.
Control: Inspect the removed zones, retain the approved temporary restraint and document damage and remaining ballast. Isolate and remove hose by the accepted route, clear waste and hand over the exact roof status before any separate tear-off.
Verification: Supervisor records zone condition, restraint and open repair or demolition actions for the receiving crew.
Why this belongs in the analysis: A clean-looking roof is not automatically ready for membrane removal or an unattended wind event.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| Work carefully and wear PPE. | Use the specified compatible hose and connections. Support and secure the route using the accepted arrangement, protect edges and maintain clear access; keep workers within protected positions during routing. |
| Check that everything is ready. | Review the roof assembly, material assessment and approved zone sequence. Resolve dust and hazardous-material controls, support capacity, wind limits and temporary restraint before disturbing aggregate. |
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
- Industrial Vacuum Roof-rock vacuum equipment and applications
- OSHA 1926.501 Duty to have fall protection
- OSHA 1926.21 Safety training and education
- OSHA 1926.300 Hand and power tools
- OSHA 1926.1153 Respirable crystalline silica
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. This example supplies no inspection findings or work authorization. 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 13, 2026
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