Heat Illness Emergency Response Toolbox Talk

Heat illness can hit fast on a jobsite, especially during hot weather, high humidity, direct sun, or heavy work. A worker may start with cramps, heavy sweating, dizziness, headache, or nausea and quickly move into confusion, vomiting, collapse, or heat stroke. By the time a person looks seriously sick, the situation may already be an emergency.

This talk covers how crews should respond when a worker shows signs of heat illness. We will focus on the warning signs to watch for, the jobsite conditions that raise the risk, the immediate actions to take, and when work must stop so the worker can get help fast.

Why This Matters

• Heat illness can get worse in minutes, especially when a worker keeps pushing through symptoms.
• Heat stroke is a medical emergency that can cause organ damage or death.
• Early action can keep heat exhaustion from turning into a life-threatening situation.
• Workers doing physical labor may not notice how fast they are overheating.
• A crew that knows what to do can respond faster and avoid panic when someone goes down.

Common Hazards

• Working in direct sun with little shade or air movement.
• Heavy tasks like lifting, carrying, demolition, roofing, or concrete work during hot parts of the day.
• Not drinking enough water before and during the shift.
• Wearing hard hats, gloves, high-visibility gear, or other PPE that traps heat.
• Returning to hot work after a weekend, time off, or a sudden jump in temperature.
• A worker is inside an attic, ceiling space, mechanical room, or enclosed area where heat builds much faster than it does outside.

Safety Checklist

Before Work Begins

• Check the weather, temperature, humidity, and work conditions for the shift.
• Make sure water, shade, cooling areas, and rest breaks are available before work starts.
• Review who to call, where to move the worker, and how responders will reach the site.
• Identify workers new to the heat or returning after time away who may need closer monitoring.
• Set the expectation that anyone feeling symptoms must speak up right away.

During Work

• At the first sign of heat illness, stop the worker's task and move them to shade or a cooler area.
• Loosen heavy clothing and PPE when safe to do so, and start cooling with water, cool cloths, ice packs, or fans.
• Give cool drinking water if the worker is awake, alert, and not vomiting.
• Call emergency services right away if the worker is confused, passes out, has a seizure, stops sweating, or does not improve quickly.
• Do not leave the worker alone. Keep watching them until they recover or medical help takes over.
• Stop work in the area if conditions are too hot to control safely or multiple workers are showing symptoms.

Crew Talking Points

• What heat illness signs should get reported immediately on this crew?
• Where is the nearest shaded or cooled area if someone starts feeling bad?
• Who calls for help, and who stays with the worker until help arrives?
• What tasks today will create the most heat stress from sun, humidity, or heavy effort?
• Are we taking enough water and rest breaks for the conditions we have right now?
• Speak up now about any heat concerns, weak spots in the plan, or anyone who may need extra monitoring today.

Stop Work If

• A worker shows signs of heat stroke, confusion, collapse, or loss of consciousness.
• Water, shade, or cooling methods are not available.
• Workers are showing repeated symptoms of overheating during the shift.
• The crew cannot get emergency help to the location quickly.
• Hot conditions, workload, or enclosed spaces make the task unsafe to continue.

Final Reminder

Heat illness is not something to tough out. Stop early, cool the worker fast, and get medical help before the situation turns critical.