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Start with a heat plan before the shift
A written heat plan gives supervisors and crews a common response before temperatures rise. Assign one person to monitor conditions and another to coordinate emergency action if staffing allows. The plan should cover the work areas, recovery areas, water locations, work/rest adjustments, acclimatization, communication, first aid and emergency transport.
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- Identify tasks with high metabolic demand, such as roofing, concrete placement, demolition, excavation, asphalt work and heavy material handling.
- Map radiant heat sources, including direct sun, hot equipment, dark roofs, curing concrete, boilers, generators and enclosed spaces.
- List the clothing and personal protective equipment (PPE) each task requires. Respirators, chemical-resistant clothing, impermeable coveralls and other ensembles can prevent sweat from evaporating.
- Choose a recovery area that workers can reach without undue delay. It should be shaded and ventilated at minimum, and air-conditioned when feasible.
- Set a check-in method for crews working out of sight or alone. Radio calls, a buddy system and scheduled supervisor rounds are more reliable than expecting an overheated worker to seek help.
- Confirm the address, gate and access route that emergency services should use. Keep the route clear and make sure supervisors can describe the worker’s location.
Review applicable federal, state, local, contract and labor requirements for heat protection. CDC/NIOSH guidance is a strong technical basis, but it does not replace a jurisdiction-specific compliance review or medical direction.
Measure heat stress where people actually work
Air temperature alone is not a safe decision rule. Humidity slows sweat evaporation; sunlight and hot surfaces add radiant load; wind changes convective cooling; and physical effort and PPE increase the body’s heat production or reduce its ability to lose heat.
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Use WBGT when possible
NIOSH recommends wet-bulb globe temperature (WBGT) for occupational heat assessment because it incorporates temperature, humidity, radiant heat and air movement more effectively than a simple thermometer. Take readings in representative work zones, not only at the site office. A shaded recovery area and a sun-exposed roof can have very different conditions.
Record the time, location, reading, task, clothing/PPE and workforce status. Recheck after major weather changes, when a crew moves, when a hot process starts and at intervals set by the heat plan. A portable WBGT meter can support this process, but the instrument does not replace competent interpretation or a complete prevention plan.
Use a heat index tool when WBGT equipment is unavailable
For small businesses without WBGT equipment, the OSHA-NIOSH Heat Safety Tool or a NOAA heat-index chart can provide a practical screening method. Treat the result as a starting point rather than a complete exposure assessment: heat-index values may not fully represent direct sun, radiant surfaces, wind, workload or protective clothing. Increase controls when those factors add heat stress.
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Compare the reading with the work, not a fixed number
| Condition to assess | Why it matters | Action when it increases heat load |
|---|---|---|
| Humidity | Reduces sweat evaporation | Increase recovery time, improve air movement and move work indoors or to a cooler period when feasible |
| Direct sun and radiant surfaces | Adds heat even when air temperature is unchanged | Add shade, cover hot surfaces where practical and reschedule exposed tasks |
| Low air movement | Limits convective cooling | Use safe fans or tempered ventilation and avoid directing contaminated air toward workers |
| Physical intensity | Raises internal heat production | Mechanize, add crew capacity, shorten work periods and lengthen rest |
| PPE and clothing | Can trap heat or block evaporation | Use the least heat-burdening compliant ensemble and provide a cooler recovery area |
Reduce heat at the source
Schedule the hottest work for cooler hours
Move lifting, demolition, roofing, paving, formwork and other strenuous outdoor tasks toward early morning or evening when site conditions permit. Avoid assuming that morning is always safe: check the measured conditions, humidity and overnight heat retention. Use cooler periods for the work that cannot be mechanized or shaded.
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Shorten exposure and increase recovery
As temperature, humidity, sunshine, low air movement, PPE or physical demand increases, use shorter work periods and longer recovery periods. A single fixed schedule is not a substitute for measuring conditions. Supervisors should be authorized to pause or change work without waiting for a worker to become symptomatic.
Mechanize and redistribute demanding tasks
- Use hoists, conveyors, carts, pumps and other equipment to reduce manual carrying.
- Increase crew size where feasible so each worker has less continuous exposure.
- Break large lifts or repetitive tasks into rotations with genuine time in a cool area.
- Prefabricate or perform cutting, assembly and other heat-producing work in a temperature-controlled space when feasible.
- Shield workers from hot equipment and surfaces with barriers, insulation or remote operation where the task allows.
Engineering controls are preferable because they reduce exposure for everyone. Fans, tempered ventilation and changes to site layout may help, but fans should not simply blow hotter air at workers, spread contaminants or interfere with lifting and fall-protection controls.
Build a recovery area workers will actually use
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- Use air conditioning or cooled ventilation when feasible; otherwise maximize safe air movement.
- Keep water, cups, first-aid supplies and communication equipment in or immediately beside the area.
- Do not use a vehicle cabin, equipment enclosure or confined space as a recovery area unless it is demonstrably safe and adequately cooled.
- Allow workers to take a break when they feel heat discomfort. Waiting for a scheduled break can delay treatment.
During recovery, remove outer PPE or clothing ensembles when doing so is safe and does not expose the worker to another hazard. Active cooling can include cool wet cloths, fans and immersion of hands and forearms. Never compromise required protection while the worker is still performing a hazardous task.
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Provide water and practical hydration
For moderate work in heat lasting less than two hours, the NIOSH construction bulletin specifies 8 ounces (one cup) of water every 15–20 minutes. This is a condition-specific guide, not a universal prescription for every task, temperature or worker. For sweating that continues for several hours, balanced electrolyte drinks may be warranted.
- Place cool drinking water close to the work, not only at the trailer.
- Provide individual cups or a hygienic equivalent; do not require workers to share a common dipper.
- Keep toilets convenient and accessible. Workers who must walk a long distance or wait for permission may limit drinking.
- Tell workers to drink regularly rather than waiting until they are very thirsty, and to report symptoms early.
- Avoid treating caffeinated or alcoholic drinks as hydration controls. Follow medical advice for workers with conditions that limit fluid intake.
Use hand and forearm immersion for quick cooling
The construction bulletin recommends a large container of cool water maintained at 10–20°C (50–68°F) for hand and forearm immersion. Replace the water when it rises above 27°C (80°F). Position the container where it cannot create a slip, electrical or contamination hazard, and refresh it often enough to maintain the range.
Acclimatize new and returning workers
Acclimatization is a gradual increase in hot-environment exposure over 7–14 days. It helps the body adapt, but it does not make a worker immune to heat illness. Continue measuring conditions and adjusting work/rest cycles after acclimatization.
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| Worker status | Day 1 | Day 2 | Day 3 | Day 4 |
|---|---|---|---|---|
| New to the hot job | No more than 20% of usual heat exposure | Increase by no more than 20% from the prior day | Increase by no more than 20% from the prior day | Increase by no more than 20% from the prior day |
| Experienced in the job’s heat | No more than 50% | No more than 60% | No more than 80% | Up to 100% |
Closely supervise newly exposed workers, especially during the first several shifts. The percentages describe the proportion of normal heat exposure, not permission to work continuously. A worker’s fitness and the actual heat stress of the assignment matter. An absence of a week or more can reduce beneficial adaptations and may require gradual reacclimatization.
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Account for PPE and personal cooling equipment
Protective clothing can prevent sweat from evaporating and may add substantial heat burden. Select the least restrictive compliant PPE, improve ventilation around the task where possible and schedule more frequent recovery for encapsulating or impermeable ensembles. Do not tell a worker to remove required PPE while exposed to the hazard it protects against.
Use wearable cooling only as a supplement
Water-cooled or air-cooled garments, cooling vests and wetted overgarments can help selected workers during rest or carefully evaluated tasks. Compare each system’s cooling duration, maintenance, weight, mobility, compatibility with fall protection and other PPE, hygiene requirements and failure mode. NIOSH notes that cooling systems vary in cost and maintenance, and ice vests may stop being cool before a practical work period ends. No wearable system replaces measurement, shade, rest and hydration.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Train the crew to recognize heat illness
Training should occur before the hot period and be reinforced at daily briefings. Workers should know that a teammate may become confused or lose coordination before asking for help. Supervisors should model early reporting and never penalize a worker for taking a heat break.
- Heat discomfort and cramps: stop, move to a cooler area, drink according to the site’s plan and notify supervision.
- Heat exhaustion: weakness, heavy sweating, headache, dizziness, nausea or faintness require removal from heat, cooling, observation and medical guidance. It can progress to heat stroke.
- Heat stroke: high body temperature, confusion, loss of coordination, hot skin with or without profuse sweating, throbbing headache, seizures or coma indicate a medical emergency.
Do not leave an ill worker alone or send them home unaccompanied. Follow the site’s emergency procedure and obtain medical evaluation when symptoms are significant, worsening or uncertain.
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Respond to suspected heat stroke immediately
NIOSH’s construction guidance states, “Heat stroke is a Medical Emergency!” Treat suspected heat stroke as potentially fatal or permanently disabling.
- Call 911 immediately. Give the site address, gate, worker location and the suspected condition.
- Move the worker to a cool, shaded location. Stop the hazardous task and keep someone with the worker.
- Remove outer clothing and PPE when safe. Do not delay cooling while waiting for a thermometer reading.
- Cool rapidly. Use cold-water or ice immersion when possible. If immersion is unavailable, use iced sheets, cold wet coverings or cooling packs and keep replacing or rewetting them.
- Continue cooling until EMS arrives unless the worker begins shivering. Follow dispatcher instructions and monitor breathing and responsiveness.
Prepare the equipment before summer: a way to obtain ice, clean containers or sheets, gloves, communication devices and a clear route for emergency responders. Document the incident and review what conditions, controls and decisions preceded it after the worker has received care.
Use a shift-by-shift operating checklist
Before work starts
- Check the forecast and measure representative work areas.
- Identify high-heat tasks, radiant sources, PPE burdens and workers in acclimatization.
- Confirm water temperature and supply, individual cups, toilets and the recovery area.
- Verify radios, first-aid supplies, ice or cooling materials and emergency access.
- Explain the day’s work/rest plan, symptoms, buddy assignments and stop-work authority.
During the shift
- Recheck conditions when the crew moves or weather changes.
- Observe new and returning workers closely.
- Prompt water and recovery breaks; honor worker-reported heat discomfort.
- Adjust task rotation, crew size, mechanization and schedule when controls are not enough.
- Record readings, changes and any symptoms or near misses.
After the shift
- Check workers before they leave, particularly anyone who needed extra recovery.
- Refill and clean water and cooling equipment.
- Review whether the recovery area stayed usable and accessible.
- Update the next shift’s plan using measured conditions and observed problems.
Common mistakes that leave a site dangerously hot
| Mistake | Why it fails | Better approach |
|---|---|---|
| Using air temperature alone | It ignores humidity, sun, wind, workload and PPE | Use WBGT where possible, or a heat-index tool plus a site-specific assessment |
| Putting water only at the trailer | Distance and lost time discourage drinking | Place water at or near each active work area |
| Relying on one fixed break schedule | Heat load changes during the day and between tasks | Shorten work and lengthen recovery as measured risk rises |
| Assuming shade solves the problem | Shade removes direct sun but may not cool humid, still air | Use ventilation or air conditioning and monitor the recovery area |
| Removing PPE to cool down during hazardous work | It can create a second, immediate exposure | Change the task or move to a safe recovery area before removing PPE |
| Making new workers work a full shift immediately | Unacclimatized workers face higher risk | Use the staged 20%/20% acclimatization approach and close supervision |
| Waiting for certainty about heat stroke | Delay can cause permanent injury | Call 911 and cool rapidly when serious signs appear |
What a well-controlled hot-weather site looks like
A functioning program is visible in the work area: a current heat reading, water within a short walk, a usable shaded or cooled recovery space, supervisors who can change the schedule, workers who know the symptoms and equipment ready for rapid cooling. The controls are adjusted for the actual task and PPE rather than copied from a generic temperature chart. Reassess whenever weather, workload, location or clothing changes, and stop work when the remaining risk cannot be controlled.
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