JHA / JSA / AHA builderHydronic Foundation Ground Thawing 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 Hydronic Foundation Ground Thawing 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 the defined ground-treatment plan
Possible hazards: Treating an unknown bearing area or confusing surface warmth with structural readiness can commit later concrete work to unsuitable ground.
Planned controls: Foundation lead identifies the building area, service clearance, initial ground condition and accepted heating plan with the responsible ground authority. Establish actual monitoring, acceptance and refreeze-protection requirements and assign the heating attendant. Keep excavation entry, unstable ground and water-remediation work outside this operation; resolve unready access before equipment setup.
Check before work: Lead confirms the bounded treatment area and actual acceptance responsibilities.
022. Position the heater and control the work area
Possible hazards: Combustion exhaust, fire exposure, unstable equipment or hoses across icy routes can cause poisoning, burns, slips or blocked emergency access.
Planned controls: Crew locates the unit on the selected manual’s suitable support with required combustible clearances and exhaust separation from occupied areas and intakes. Establish protected power and fuel arrangements, hose routes, pedestrian boundaries and emergency access. Plan cold-weather traction and recovery resources and retain a spill response appropriate to the actual fluid and fuel.
Check before work: Lead checks support, exhaust, fire controls and protected work routes.
033. Inspect and deploy the compatible hose system
Possible hazards: Damaged couplings, unsuitable fluid or hose-reel movement can release hot liquid, trap hands or prevent controlled heat delivery.
Planned controls: Trained personnel check the identified heater, fluid condition, hoses, connections, controls and protective devices under its actual instructions. Deploy the accepted hose and covering layout using the prescribed handling method and safe reel positions. Hold defects or missing compatibility evidence; do not bypass alarms, alter burner settings or improvise a replacement fluid or coupling.
Check before work: Operator verifies prescribed pre-use and hose-layout findings before startup.
044. Operate and monitor the released treatment
Possible hazards: An unnoticed leak, burner fault or changing ground condition can expose workers and undermine the intended thawing without a clear stop decision.
Planned controls: Attendant starts and operates the unit through its actual procedure and checks the prescribed equipment and treatment indicators. Maintain required observation, protected routes and the agreed ground-monitoring record. Stop for leaks, abnormal response, alarms or conditions outside the plan; isolate the affected operation through the unit’s method and obtain authorized correction rather than increasing heat to overcome a problem.
Check before work: Attendant records required operating observations and escalates changed conditions.
055. Obtain ground and placement-readiness disposition
Possible hazards: Removing protection or calling concrete on the basis of elapsed heating time can expose inadequately treated or softened ground to the intended loads.
Planned controls: Responsible ground and concrete personnel assess the actual treated area through the project’s specified method and evidence. Keep unresolved locations held and obtain any necessary technical disposition. Identify accepted boundaries and the protection needed until placement, with equipment and loads restricted to the released condition; the heating crew does not certify soil capacity from a hose temperature.
Check before work: Named foundation authority records actual disposition and remaining restrictions.
066. Shut down and transfer refreeze protection
Possible hazards: Residual hot fluid, uncontrolled reel handling or a gap in protection can burn workers or return accepted ground to an unsuitable condition.
Planned controls: Operator follows the actual cooling, shutdown and hose-recovery method, verifying safe conditions before permitted connection or handling work. Capture any collected fluid and secure equipment without disturbing the accepted bearing area. Transfer actual treatment observations, ground disposition, held locations and refreeze-protection ownership to the receiving foundation lead; concrete placement begins through its separate readiness process.
Check before work: Receiving lead confirms shutdown disposition and continuing ground protection.
Example scope and starting conditions
A trained heating crew will thaw one released building-foundation bearing area with a selected closed-fluid hydronic hose heater before concrete placement. The actual unit instructions govern safe heating and hose handling; responsible ground and concrete personnel determine bearing and placement readiness. Work stays outside an excavation and excludes groundwater remediation. This fictional learning example describes planned controls; it records no actual inspection or work authorization.
- The bounded bearing area, services, ground access and heating method are released. The responsible geotechnical or foundation authority establishes actual assessment and acceptance requirements; warm surface readings alone do not establish bearing readiness.
- The exact heater, hose and heat-transfer-fluid instructions establish setup, operating limits, attendance and safe shutdown. A fire and exhaust plan, suitable power supply, protected routes and cold-weather worker arrangements are available; this example supplies no universal thaw depth, temperature or duration.
- Cold-weather concrete 238110-25 and footing/foundation 238110-07 connections are partial: ground thawing before a building-foundation placement only. Excavation entry, drainage or groundwater work, heater repair, soil replacement, concrete delivery and curing are excluded.
Know when to pause
- The bearing-area release, service clearance, actual ground-assessment method or responsible acceptance authority is missing.
- The heater, hose, fluid, exhaust, control response or support differs from the selected instructions or leaks occur.
- Access, attendance, monitoring, cold-weather recovery or refreeze protection cannot be maintained.
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
- Who establishes and verifies actual bearing and placement readiness for this treated area?
- How will the selected heater, hot-fluid hoses and exhaust remain separated from workers, combustibles and building intakes?
- Who monitors the operation and prevents the accepted area from refreezing before its next release?
Training and qualifications to confirm
- Selected hydronic-unit instruction on compatible hoses, pre-use checks, controlled operation, reel handling and verified safe shutdown without generic valve or fluid recipes.
- Instruction on burner and hot-fluid exposure, spill reporting, cold-weather access and the separate ground-acceptance and protection handover.
Confirm the actual training evidence for the assigned people. A toolbox talk does not establish competence.
Decisions that change the plan
Does an accepted thawing record release an excavation or prove soil capacity?
No. This operation treats a defined accessible building bearing area and records the actual ground authority’s disposition. Excavation protection, groundwater conditions and foundation design require their own decisions. Keep any changed or uncertain ground held and obtain responsible assessment; a warmer surface or running hydronic heater cannot replace those releases.
What must the crew record for actual use?
Record treatment boundaries, service and ground-release basis, actual heater and hose instructions, assigned attendant, required operating and ground observations, interruptions and dispositions. Identify the accepting foundation authority, held locations, safe shutdown findings, refreeze-protection ownership and separate concrete readiness requirements; enter actual findings only.
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.
Cold Weather: Check Warmth, Traction and Recovery →Fire Prevention: Separate Fuel from Ignition →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 the defined ground-treatment plan
Hazard: Treating an unknown bearing area or confusing surface warmth with structural readiness can commit later concrete work to unsuitable ground.
Control: Foundation lead identifies the building area, service clearance, initial ground condition and accepted heating plan with the responsible ground authority. Establish actual monitoring, acceptance and refreeze-protection requirements and assign the heating attendant. Keep excavation entry, unstable ground and water-remediation work outside this operation; resolve unready access before equipment setup.
Verification: Lead confirms the bounded treatment area and actual acceptance responsibilities.
Why this belongs in the analysis: Heating readiness and foundation-bearing acceptance are different decisions.
2. Position the heater and control the work area
Hazard: Combustion exhaust, fire exposure, unstable equipment or hoses across icy routes can cause poisoning, burns, slips or blocked emergency access.
Control: Crew locates the unit on the selected manual’s suitable support with required combustible clearances and exhaust separation from occupied areas and intakes. Establish protected power and fuel arrangements, hose routes, pedestrian boundaries and emergency access. Plan cold-weather traction and recovery resources and retain a spill response appropriate to the actual fluid and fuel.
Verification: Lead checks support, exhaust, fire controls and protected work routes.
Why this belongs in the analysis: A thawing arrangement must not create another uncontrolled exposure beside the foundation.
3. Inspect and deploy the compatible hose system
Hazard: Damaged couplings, unsuitable fluid or hose-reel movement can release hot liquid, trap hands or prevent controlled heat delivery.
Control: Trained personnel check the identified heater, fluid condition, hoses, connections, controls and protective devices under its actual instructions. Deploy the accepted hose and covering layout using the prescribed handling method and safe reel positions. Hold defects or missing compatibility evidence; do not bypass alarms, alter burner settings or improvise a replacement fluid or coupling.
Verification: Operator verifies prescribed pre-use and hose-layout findings before startup.
Why this belongs in the analysis: The complete selected system must be ready before heat and circulation are introduced.
4. Operate and monitor the released treatment
Hazard: An unnoticed leak, burner fault or changing ground condition can expose workers and undermine the intended thawing without a clear stop decision.
Control: Attendant starts and operates the unit through its actual procedure and checks the prescribed equipment and treatment indicators. Maintain required observation, protected routes and the agreed ground-monitoring record. Stop for leaks, abnormal response, alarms or conditions outside the plan; isolate the affected operation through the unit’s method and obtain authorized correction rather than increasing heat to overcome a problem.
Verification: Attendant records required operating observations and escalates changed conditions.
Why this belongs in the analysis: Measured equipment operation supports the assessment but cannot supply a bearing release.
5. Obtain ground and placement-readiness disposition
Hazard: Removing protection or calling concrete on the basis of elapsed heating time can expose inadequately treated or softened ground to the intended loads.
Control: Responsible ground and concrete personnel assess the actual treated area through the project’s specified method and evidence. Keep unresolved locations held and obtain any necessary technical disposition. Identify accepted boundaries and the protection needed until placement, with equipment and loads restricted to the released condition; the heating crew does not certify soil capacity from a hose temperature.
Verification: Named foundation authority records actual disposition and remaining restrictions.
Why this belongs in the analysis: Thawing completion must be established through the required ground assessment, not an equipment timer.
6. Shut down and transfer refreeze protection
Hazard: Residual hot fluid, uncontrolled reel handling or a gap in protection can burn workers or return accepted ground to an unsuitable condition.
Control: Operator follows the actual cooling, shutdown and hose-recovery method, verifying safe conditions before permitted connection or handling work. Capture any collected fluid and secure equipment without disturbing the accepted bearing area. Transfer actual treatment observations, ground disposition, held locations and refreeze-protection ownership to the receiving foundation lead; concrete placement begins through its separate readiness process.
Verification: Receiving lead confirms shutdown disposition and continuing ground protection.
Why this belongs in the analysis: The handover protects both workers and the ground condition needed for the next operation.
Compare control wording
| Needs improvement | More useful for this scenario |
|---|---|
| The ground feels warm; call the concrete. | Responsible personnel assess the actual treated bearing area and placement readiness using project-required evidence. |
| Use yesterday’s hose spacing and burner setting. | Operator applies the selected unit’s actual method and current ground-treatment plan, with assigned monitoring and protection. |
Common questions
Can this example be used as a JSA?
Adapt its Task | Hazard | Control analysis to the employer’s JSA format and actual task. Confirm assigned checks and record real findings before work.
What changes if the project requires an AHA?
Use the project’s governing AHA format, risk method, supporting records and acceptance process. The published formwork AHA illustrates additional structure; this example supplies no AHA 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
- Wacker Neuson Hydronic Surface Heaters: intended ground-thawing application
- NRMCA CIP 27 Cold Weather Concreting: contact-surface preparation
- OSHA 1926.154 Temporary heating devices
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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