JHA / JSA / AHA builderRoof Moisture Survey with Impedance Scanner 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 Roof Moisture Survey with Impedance Scanner 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 roof information and survey limits
Possible hazards: An incompatible assembly can produce misleading readings; unsafe access can expose the surveyor to a fall.
Planned controls: Review roof build-up and scanner limitations. Verify surfaces are free of rain or dew and any aggregate is dry and uniform as required. Reject incompatible conductive surfaces; verify roof protection and safe routes.
Check before work: Survey lead records assembly information, suitability review and the area released for scanning.
022. Inspect and prepare the scanner
Possible hazards: Damaged contact components or unstable handles can cause unreliable data or loss of control on the roof.
Planned controls: Inspect the actual scanner and electrode contact surface, assemble its handle securely and verify power, communication and applicable calibration evidence as instructed. Use the accepted roof-delivery method and avoid dragging equipment across vulnerable details.
Check before work: Operator records equipment condition and confirms normal function at the protected starting point.
033. Establish the comparative reference and settings
Possible hazards: An unsupported reference or unsuitable range can make apparent wet and dry areas misleading.
Planned controls: Use the selected-model reference and range method for the known assembly. Document the basis for the reference area and any uncertainty; obtain additional review when a defensible reference cannot be established.
Check before work: Surveyor records settings, reference location and the limitations that apply before starting the scan grid.
044. Scan the planned safe route
Possible hazards: Attention to the display can distract from roof openings, obstacles or deteriorated areas.
Planned controls: Follow the recorded scan pattern while maintaining safe footing and the required contact method. Stop before repositioning near obstacles, keep clear of protected boundaries and pause for unsafe weather or changing roof conditions.
Check before work: Operator checks location and safe route at each marked survey segment and logs areas not accessed.
055. Record and review indications without overclaiming
Possible hazards: False positives or undocumented setting changes can lead to unnecessary disturbance or missed investigation.
Planned controls: Map comparative indications and retain the relevant settings and observations. Review changes in construction and known material interferences; label uncertain areas for separate confirmation instead of declaring a leak source or a dry roof.
Check before work: Survey lead checks the map against settings, assembly boundaries and all inaccessible or uncertain areas.
066. Hand over findings and secure equipment
Possible hazards: A vague survey report can trigger unplanned intrusive work or leave roof access uncontrolled.
Planned controls: Give the reviewer the route map, settings, indications and limitations. Identify proposed confirmation tasks requiring another release, secure equipment for transport and restore the agreed roof-access controls.
Check before work: Lead records the report handoff and the separate decisions still needed for confirmation or repair.
Example scope and starting conditions
A trained surveyor maps comparative moisture indications across one released low-slope roof using a nonpenetrating impedance scanner. Roof assembly information, safe access and the scan route are available; any later core sampling or intrusive confirmation will be separately authorized. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- Partial inspection and maintenance coverage: instrument selection, nonpenetrating survey and documented indications; no core cutting, leak repair or guaranteed water-entry location.
- The selected scanner instructions identify compatible roof materials, assembly limitations and the required reference and range method.
- Protected roof edges and openings, accepted load capacity, suitable weather and an unobstructed route permit the operator to watch both the instrument and footing.
Know when to pause
- Pause for wet or unsuitable survey surfaces, incompatible assembly materials, missing roof information, unresolved calibration, damaged contacts or unreliable communication.
- Stop for an unsupported reference, unsafe footing or weather, changed construction or unexpected instrument behavior.
- Core sampling, membrane puncture or repair requires a separate material, service and waterproofing work plan.
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.
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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
- Is the actual roof build-up suitable for this impedance method, including conductive or metal-faced layers?
- What supports the chosen reference area, and how are the settings and survey locations recorded?
- Who reviews indications and authorizes a separate investigation when readings or conditions are uncertain?
Training and qualifications to confirm
- Demonstrate scanner selection, reference and range setup, mapped survey technique and recognition of incompatible materials or misleading indications.
- Verify safe roof access and train reviewers to distinguish comparative indications, confirmation work and an actual repair decision.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
Does a high scanner reading prove the leak entry point?
It identifies an indication requiring interpretation within the roof assembly and instrument limitations. Document uncertainty and arrange the appropriate separately authorized confirmation; do not report a guaranteed entry point or absolute dry condition from this survey.
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 →Severe Weather: Know When and Where to Shelter →Safety Checklists: Show the Evidence Before the Tick →
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 roof information and survey limits
Hazard: An incompatible assembly can produce misleading readings; unsafe access can expose the surveyor to a fall.
Control: Review roof build-up and scanner limitations. Verify surfaces are free of rain or dew and any aggregate is dry and uniform as required. Reject incompatible conductive surfaces; verify roof protection and safe routes.
Verification: Survey lead records assembly information, suitability review and the area released for scanning.
Why this belongs in the analysis: Instrument suitability and safe access must both be resolved before a useful survey can begin.
2. Inspect and prepare the scanner
Hazard: Damaged contact components or unstable handles can cause unreliable data or loss of control on the roof.
Control: Inspect the actual scanner and electrode contact surface, assemble its handle securely and verify power, communication and applicable calibration evidence as instructed. Use the accepted roof-delivery method and avoid dragging equipment across vulnerable details.
Verification: Operator records equipment condition and confirms normal function at the protected starting point.
Why this belongs in the analysis: An instrument that powers on may still have damaged contacts affecting its readings.
3. Establish the comparative reference and settings
Hazard: An unsupported reference or unsuitable range can make apparent wet and dry areas misleading.
Control: Use the selected-model reference and range method for the known assembly. Document the basis for the reference area and any uncertainty; obtain additional review when a defensible reference cannot be established.
Verification: Surveyor records settings, reference location and the limitations that apply before starting the scan grid.
Why this belongs in the analysis: Relative readings need a stated comparison basis rather than a generic claim that low means dry.
4. Scan the planned safe route
Hazard: Attention to the display can distract from roof openings, obstacles or deteriorated areas.
Control: Follow the recorded scan pattern while maintaining safe footing and the required contact method. Stop before repositioning near obstacles, keep clear of protected boundaries and pause for unsafe weather or changing roof conditions.
Verification: Operator checks location and safe route at each marked survey segment and logs areas not accessed.
Why this belongs in the analysis: An unscanned or unsafe area must remain visible in the record rather than becoming an implied clear result.
5. Record and review indications without overclaiming
Hazard: False positives or undocumented setting changes can lead to unnecessary disturbance or missed investigation.
Control: Map comparative indications and retain the relevant settings and observations. Review changes in construction and known material interferences; label uncertain areas for separate confirmation instead of declaring a leak source or a dry roof.
Verification: Survey lead checks the map against settings, assembly boundaries and all inaccessible or uncertain areas.
Why this belongs in the analysis: The map represents instrument indications, not a substitute for the chosen confirmation method.
6. Hand over findings and secure equipment
Hazard: A vague survey report can trigger unplanned intrusive work or leave roof access uncontrolled.
Control: Give the reviewer the route map, settings, indications and limitations. Identify proposed confirmation tasks requiring another release, secure equipment for transport and restore the agreed roof-access controls.
Verification: Lead records the report handoff and the separate decisions still needed for confirmation or repair.
Why this belongs in the analysis: The next action should follow the stated evidence and uncertainty rather than an assumed meter diagnosis.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| Work carefully and wear PPE. | Use the selected-model reference and range method for the known assembly. Document the basis for the reference area and any uncertainty; obtain additional review when a defensible reference cannot be established. |
| Check that everything is ready. | Review roof build-up and scanner limitations. Verify surfaces are free of rain or dew and any aggregate is dry and uniform as required. Reject incompatible conductive surfaces; verify roof protection and safe routes. |
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
- Tramex Dec Scanner user guide: selection, comparative readings and limitations
- OSHA 1926.501 Duty to have fall protection
- OSHA 1926.21 Safety training and education
- 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. 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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