JHA / JSA / AHA builderCurb-Mounted Skylight Step-Flashing Completion 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 Curb-Mounted Skylight Step-Flashing Completion 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 curb and compatible flashing route
Possible hazards: Wrong kit geometry, unsuitable roofing or an incomplete curb can lead to improvised details and exposure at an opening that has not been accepted.
Planned controls: Lead matches accepted curb, slope, shingle exposure and ECL kit to applicable instructions. Resolve supplementary pieces and water/snow details with the technical authority. Compare supplied instructions with the retrieved older edition before assembly. Hold mismatches; do not cut the kit to an invented fit.
Check before work: Lead verifies curb release, kit identity and the applicable detail set.
022. Prepare protected access and flashing work positions
Possible hazards: The open curb, roof edge, sharp metal and loose offcuts can create a fall-through, fall, cut or dropped-object exposure during detailed work.
Planned controls: Check roof and continuous opening protection and verify access to every flashing position. Secure tools, components and sharp offcuts; separate work below. A protection change follows its accepted sequence before access changes. Never step on the future glazing position or an unverified cover.
Check before work: Lead verifies each work position, effective opening protection and controlled staging.
033. Integrate the curb and roof underlayment
Possible hazards: Dirty surfaces, reverse laps or an improvised cut can leave a hidden water path; reaching across the curb can also expose a worker to the opening.
Planned controls: From protected positions, prepare accepted dry, clean surfaces without disturbing the curb. Apply prescribed bottom, side and top underlayment and water-shedding integration under the applicable new-construction detail. Maintain opening protection and check layers before concealment. Hold damaged substrate or uncertain transitions for technical disposition.
Check before work: Assigned checker verifies surfaces, lap direction and concealed-layer details.
044. Install sill and interwoven step flashing
Possible hazards: Exposed fasteners, incorrect step overlap or loosely restrained metal can create water paths and cut the crew as shingles are fitted.
Planned controls: Follow the kit’s sill attachment and side step sequence, interweaving with scheduled shingles. Use prescribed attachment positions and pieces; protect hands and keep tools inside safe access. Check clearances and overlaps progressively. Do not replace missing flashing with caulk or penetrate prohibited water-shedding areas.
Check before work: Assigned checker verifies sill, step integration and permitted attachment locations.
055. Complete saddle flashing and inspect the water path
Possible hazards: A reversed head lap, blocked drainage clearance or nail through saddle flashing can defeat the assembly while the finished roof appears complete.
Planned controls: Install prescribed saddle/head flashing and integrate upper underlayment and shingles. Maintain clearances and avoid prohibited saddle penetrations. Lead checks drainage continuity around the curb, required supplementary details and concealed-stage evidence. Hold discrepancies for correction before releasing flashing readiness for separate glazing.
Check before work: Roofing lead verifies completed detail continuity and open technical issues.
066. Hand over the protected curb for separate glazing
Possible hazards: A completed flashing kit may be mistaken for a finished skylight or a safe walking surface, exposing later workers to the still-open curb.
Planned controls: Clear secured tools and offcuts by the accepted route while maintaining opening protection. Record kit, checks and open issues and transfer the protected curb to the setting lead. Identify separate seating acceptance and later protection-change responsibility; maintain restrictions until next-stage controls are effective.
Check before work: Receiving lead confirms opening state, flashing findings and separate setting responsibility.
Example scope and starting conditions
A roofing crew will complete a compatible VELUX ECL flashing kit on one accepted site-built curb in a shingle roof before a separately planned crew seats the glazed skylight. Underlayment, sill, step and saddle details follow the applicable kit route. The opening remains protected throughout. This fictional learning example describes planned controls and records no actual inspection or authorization.
- The curb, roof material, slope, kit size and shingle exposure are matched to the actual manufacturer requirements. Retrieved ECL guide VAS 452204-0309 is a 2009 edition; verify the applicable supplied instructions and resolve differences before field use.
- Curb and surrounding deck acceptance, roof access and fall protection are established. Guarding or an accepted rated cover protects the opening and fits the flashing sequence; glazing is never assumed to be fall-through protection.
- Skylight roof flashing 238160-24 and flashing work 238160-21 are partial connections. This cycle excludes new openings, curb construction, roof repair, skylight lifting or seating, whole-roof shingling, membrane welding and reliance on sealant as a substitute for kit laps.
Know when to pause
- Curb, kit, slope, roof material, shingle exposure or supplied guide differs from the accepted detail route.
- Opening protection, roof protection, safe fitting access or secure sharp-metal staging cannot be maintained.
- Damaged substrate, reverse lap, prohibited penetration or missing piece prevents verification of the intended water path.
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
- Which kit, curb, roof and shingle details apply, and who resolves a difference between the retrieved and supplied instructions?
- How will opening and roof-fall protection stay effective during every underlayment and flashing stage?
- Who verifies the completed water-shedding details and transfers a protected curb to the separate skylight-setting crew?
Training and qualifications to confirm
- Instruction on the actual compatible ECL kit, instruction edition, underlayment integration and sill/step/saddle sequence, including permitted fasteners and required clearances.
- Task instruction on roof and opening protection, sharp flashing and cutting controls, staged detail checks and the separate glazing handoff without treating glass as a cover.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
Can the crew remove opening protection to reach the saddle?
Only through a separately accepted protection-change method that establishes effective protection before the exposed work position is used. If the current arrangement prevents the kit sequence, stop and resolve the interface with the responsible leads. Neither an uninstalled skylight nor glazing that has been seated without an accepted fall-through protection basis can replace the planned opening controls.
What must the crew record for actual use?
Record curb and roof acceptance, kit and supplementary parts, actual instructions and edition comparison, slope and roofing compatibility, and opening protection. Record concealed underlayment, sill, step and saddle checks, fastener and clearance findings and technical dispositions. Identify unfinished glazing, receiving lead and protection-change responsibility; enter actual results rather than copying a complete flashing acceptance.
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.
Skylights: Verify Fall-Through Protection →Steep-Slope Roofs: Verify Protection Before Access →Work Turnover: Transfer the State, Not Just the Story →
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 curb and compatible flashing route
Hazard: Wrong kit geometry, unsuitable roofing or an incomplete curb can lead to improvised details and exposure at an opening that has not been accepted.
Control: Lead matches accepted curb, slope, shingle exposure and ECL kit to applicable instructions. Resolve supplementary pieces and water/snow details with the technical authority. Compare supplied instructions with the retrieved older edition before assembly. Hold mismatches; do not cut the kit to an invented fit.
Verification: Lead verifies curb release, kit identity and the applicable detail set.
Why this belongs in the analysis: Compatibility determines the water-shedding route before installation begins.
2. Prepare protected access and flashing work positions
Hazard: The open curb, roof edge, sharp metal and loose offcuts can create a fall-through, fall, cut or dropped-object exposure during detailed work.
Control: Check roof and continuous opening protection and verify access to every flashing position. Secure tools, components and sharp offcuts; separate work below. A protection change follows its accepted sequence before access changes. Never step on the future glazing position or an unverified cover.
Verification: Lead verifies each work position, effective opening protection and controlled staging.
Why this belongs in the analysis: Flashing access must be designed around maintained protection.
3. Integrate the curb and roof underlayment
Hazard: Dirty surfaces, reverse laps or an improvised cut can leave a hidden water path; reaching across the curb can also expose a worker to the opening.
Control: From protected positions, prepare accepted dry, clean surfaces without disturbing the curb. Apply prescribed bottom, side and top underlayment and water-shedding integration under the applicable new-construction detail. Maintain opening protection and check layers before concealment. Hold damaged substrate or uncertain transitions for technical disposition.
Verification: Assigned checker verifies surfaces, lap direction and concealed-layer details.
Why this belongs in the analysis: Underlayment defects become harder to identify after metal flashing covers them.
4. Install sill and interwoven step flashing
Hazard: Exposed fasteners, incorrect step overlap or loosely restrained metal can create water paths and cut the crew as shingles are fitted.
Control: Follow the kit’s sill attachment and side step sequence, interweaving with scheduled shingles. Use prescribed attachment positions and pieces; protect hands and keep tools inside safe access. Check clearances and overlaps progressively. Do not replace missing flashing with caulk or penetrate prohibited water-shedding areas.
Verification: Assigned checker verifies sill, step integration and permitted attachment locations.
Why this belongs in the analysis: Each course must connect to the intended drainage path.
5. Complete saddle flashing and inspect the water path
Hazard: A reversed head lap, blocked drainage clearance or nail through saddle flashing can defeat the assembly while the finished roof appears complete.
Control: Install prescribed saddle/head flashing and integrate upper underlayment and shingles. Maintain clearances and avoid prohibited saddle penetrations. Lead checks drainage continuity around the curb, required supplementary details and concealed-stage evidence. Hold discrepancies for correction before releasing flashing readiness for separate glazing.
Verification: Roofing lead verifies completed detail continuity and open technical issues.
Why this belongs in the analysis: The head and side details must shed water into an intact lower path.
6. Hand over the protected curb for separate glazing
Hazard: A completed flashing kit may be mistaken for a finished skylight or a safe walking surface, exposing later workers to the still-open curb.
Control: Clear secured tools and offcuts by the accepted route while maintaining opening protection. Record kit, checks and open issues and transfer the protected curb to the setting lead. Identify separate seating acceptance and later protection-change responsibility; maintain restrictions until next-stage controls are effective.
Verification: Receiving lead confirms opening state, flashing findings and separate setting responsibility.
Why this belongs in the analysis: Flashing completion changes the work stage, not the opening hazard.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| Put the skylight on first and work flashing around it. | Crew follows the actual ECL-compatible sequence, preserves opening protection and transfers completed flashing to separately planned skylight seating. |
| Caulk the gaps and call the flashing finished. | Roofing lead verifies prescribed pieces, water-shedding laps, attachment positions and clearances before releasing the flashing handoff. |
Common questions
Can this example be used as a JSA?
Adapt the Task | Hazard | Control analysis to the employer’s JSA and actual work. Confirm assigned checks and record real findings before use.
What changes if the project requires an AHA?
Use the governing project format, risk method and acceptance process. The published formwork AHA illustrates additional structure; this example supplies no project risk rating or acceptance.
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
- VELUX ECL Curb Mounted Skylight Flashing Instructions, VAS 452204-0309 (2009 edition)
- VELUX Professional flashing-system compatibility information
- OSHA 1926.501 Fall and opening protection
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 12, 2026.
Developed by Todd Jerome Jenkins, MS, CSP · Edition v1.0 · October 13, 2026
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