First, describe the work and worksite
A concrete crew will protect a newly placed ground-level building slab with specified insulating blankets and a temporary enclosure heated by an indirect-fired unit located outside. A designated attendant monitors the arrangement. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- The concrete protection plan establishes temperature monitoring and the conditions for changing or removing protection.
- Heater, duct, ventilation and exhaust arrangements follow the actual unit instructions and site fire plan.
- Concrete placement, direct-fired indoor heaters and stripping or strength-based loading are outside this example.
Questions before work
- Who sets the concrete temperature criteria and reviews records?
- Where will combustion exhaust go relative to intakes and occupied areas?
- How are enclosure exits, fire clearances and monitoring maintained overnight?
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. Release the protection plan
Hazard: Unplanned heating can expose workers or conceal an unsafe slab condition.
Control: Concrete lead establishes protection limits, monitoring locations and responsible attendants. Confirm blanket access will not damage the slab and separate curing criteria from any structural loading release.
Verification: Lead checks the plan and slab handover before blanket installation.
Why this belongs in the analysis: Temperature protection is not evidence of safe structural loading.
2. Install blankets and enclosure
Hazard: Wind can move coverings; frames, ties and cords can block exits or create trip hazards.
Control: Secure the enclosure using the planned supports and wind limits. Lay blankets from released access and keep designated exits and walking routes clear; protect heater clearances.
Verification: Foreperson checks tie security and exits before enclosure use.
Why this belongs in the analysis: Covering the slab must not remove escape access.
3. Position the external heater
Hazard: Exhaust entering a doorway or intake can cause carbon-monoxide poisoning; hot ducts can ignite coverings.
Control: Assigned heater operator positions the indirect-fired unit, exhaust and ducts using its instructions and required clearances. Verify ventilation and combustion separation; do not rely on smell or a CO alarm as the sole control.
Verification: Operator and lead check the complete air and exhaust route before startup.
Why this belongs in the analysis: External placement alone does not prevent exhaust recirculation.
4. Start and monitor heating
Hazard: A heater fault, blocked airflow or temperature change can create fire or exposure.
Control: Trained attendant performs specified startup checks and monitors heater condition, enclosure air and concrete temperature at planned intervals. Use selected exposure monitoring where required; stop for alarms, symptoms or unsafe airflow.
Verification: Attendant records actual readings and actions rather than copying planned values.
Why this belongs in the analysis: A monitoring plan needs real observations to function.
5. Refuel and transfer attendance
Hazard: Unattended malfunction or fuel near hot equipment can create a fire.
Control: Follow the unit’s shutdown and cooling instructions for fuel service. Transfer responsibility, readings, fuel arrangements, limits and emergency actions to the next attendant; do not leave a system unattended unless its instructions and site plan permit.
Verification: Outgoing and incoming attendants confirm the handover and contact method.
Why this belongs in the analysis: Cold-weather protection often spans shifts.
6. Remove protection by release
Hazard: Early removal, hot ducts or unsecured coverings can expose the next crew.
Control: Obtain the concrete lead’s protection-removal release, shut down and cool the heater, and remove coverings in the planned sequence. Secure equipment and communicate remaining access or loading restrictions.
Verification: Lead records release and checks the cleared access before handover.
Why this belongs in the analysis: Curing-protection removal and structural acceptance are separate decisions.
What does a useful control look like?
| Needs improvement | More useful for this scenario |
|---|---|
| Work carefully and wear PPE. | Assigned heater operator positions the indirect-fired unit, exhaust and ducts using its instructions and required clearances. Verify ventilation and combustion separation; do not rely on smell or a CO alarm as the sole control. |
| Check that everything is ready. | Concrete lead establishes protection limits, monitoring locations and responsible attendants. Confirm blanket access will not damage the slab and separate curing criteria from any structural loading release. |
Decisions that change the analysis
Does reaching the curing temperature authorize form removal or loading?
No. Those decisions need their separate documented strength and design criteria. This analysis covers protection and heating, not structural acceptance.
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
- Exhaust path, ventilation or heater clearances change.
- CO alarm, exposure symptoms, fire, heater fault or lost monitoring.
- Wind affects enclosure stability or concrete temperatures leave planned limits.
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
- Actual heater setup, ventilation, fuel service and emergency shutdown instruction.
- Concrete protection monitoring, exposure response and shift-handover responsibilities.
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
- OSHA 1926.154 Temporary heating devices
- OSHA 1926.21 Safety training and education
- OSHA 1910.1200 Hazard communication
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.