The Cost of Heat Stress on Construction Sites—and Practical Strategies You Can Start Using Now to Mitigate it
Heat stress isn’t just a health risk—it also carries hidden costs that affect every level of a building project.
As summer progresses, people who work outside are at elevated risk for a variety of heat-related maladies, ranging from mild discomfort to life-threatening heat stroke. The human consequences can be dire. But the financial impact for workers, contractors, and project owners can also be serious.
Normal human experience tells us that when it’s hot we work more slowly and less efficiently. Heat stress can impair cognitive function, attention, and decision-making. Construction supervisors find that their workers need more breaks. Absenteeism can increase.
These factors alone can have a negative effect on project schedules and work quality. But when serious risk signs go unheeded, the results can be disastrous.
1. Heat Exhaustion
Occurs when body temperature is between 101°F – 104°F
Symptoms:
- Headache
- Dizziness
- Nausea
- Profuse sweating
- Rapid breathing
- Rapid heart rate
- Muscle cramps
- Low blood pressure
- Confusion
2. Heat Stroke
Occurs when body temperature reaches 104°F or higher
Additional Symptoms:
- Slurred speech
- Hot, dry or flushed skin
- Unconsciousness
⚠️ EMERGENCY: This is a life-threatening condition requiring immediate medical attention!
Emergency Response Steps
When workers at a construction site experience either of these conditions, they must stop working. In the case of heat stroke, professional help is required. Meanwhile, co-workers can take several steps to cool the victim’s body:
Move to Cool Location
Loosen/Remove Clothing
Apply Wet Cloths
Immerse in Cool Water
The Hidden Costs of Heat Stress
3,066
heat deaths (2018-2020)
$23,000
direct cost per incident
104°F
heat stroke threshold
In severe cases hospitalization may be required. Sadly, fatalities from heat-related conditions are not uncommon. According to the Centers for Disease Control and Prevention (CDC), 3,066 people died from heat-related conditions in the United States from 2018 to 2020.
Beyond the immediate impact at the workplace, heat-related incidents can lead to additional costs, including:
- Medical expenses
- Workers’ compensation claims
- Higher insurance costs
- Legal liability
The federal Occupational Safety and Health Administration (OSHA) helps employers estimate the costs of specific workplace injuries. And the figures can be sobering: A single incident of “heat prostration” can incur more than $23,000 in direct costs—and double that amount in indirect costs.
Reducing the Risks of Heat Stress
Clearly, heat stress is an issue construction employers can’t afford to ignore.
Common Sense Actions
Some of the actions that can help avoid heat-related incidents are just common sense:
- Make sure workers stay hydrated.
- Encourage workers to wear hats and cool clothing.
- Avoid work in direct sun when possible.
- Schedule adequate breaks during hot weather.
- Keep a first-aid kit on hand. The kit should include, among other things:
- Cold packs
- Spray bottles with cool water
- Thermometers
- Damp cloths
- Electrolyte tablets
- Emergency blankets
Proactive Prevention Strategies
📚Education
🏗️Site Design
📅Scheduling
👥Collaboration
🌡️Monitoring
⚠️Awareness
Make workers and supervisors aware of the early warning signs of heat stress such as:
- Confusion
- Irritability
- Slowed responses
Building a Culture of Heat Safety
When team leaders stress the importance of preventing heat stress, workers will likely pick up on it. Supervisors can engage crews in safety discussions and encourage feedback on hot weather challenges. And workers should be encouraged to report heat symptoms without stigma.
Summer Heat Safety Checklist for Construction Sites
Pre-Shift Preparation
- ☐ Monitor the Weather Forecast (temperature, humidity, heat index)
- ☐ Review Heat Illness Prevention Plan with Supervisors
- ☐ Ensure All Employees Have Heat Safety Training
- ☐ Assign a Heat Safety Monitor (on-site supervisor or foreman)
Hydration & Rest
- ☐ Provide Easily Accessible Water Stations (1 cup every 15–20 minutes)
- ☐ Encourage Regular Hydration Breaks
- ☐ Allow for Frequent Rest Breaks in the Shade or Air Conditioning
- ☐ Stock Electrolyte Replacements (especially for extended work periods)
Clothing & Gear
- ☐ Require Lightweight, Light-Colored, Loose-Fitting Clothing
- ☐ Provide Wide-Brimmed Hats or Neck Shades
- ☐ Ensure Access to Cooling Towels or Vests
- ☐ Encourage Use of Sunscreen (SPF 30 or higher)
Scheduling & Work Practices
- ☐ Schedule Strenuous Tasks for Early Morning or Late Afternoon
- ☐ Rotate Workers in Hot Zones to Prevent Overexertion
- ☐ Reduce Physical Exertion When Possible
- ☐ Use Mechanical Aids or Equipment to Minimize Manual Labor
Health Monitoring & Emergency Response
- ☐ Review Heat Illness Symptoms with Crews
- ☐ Establish a Clear Emergency Action Plan
- ☐ Ensure Supervisors Know First Aid for Heat Stroke/Exhaustion
- ☐ Have Emergency Contact Information On-Site and Up-to-Date
- ☐ Use Buddy System to Watch for Signs of Heat Stress
Break Area Setup
- ☐ Provide Shaded or Air-Conditioned Rest Areas
- ☐ Supply Ice, Cold Water, and Electrolyte Beverages
- ☐ Offer Cooling Misters or Portable Fans (if feasible)
Documentation & Compliance
- ☐ Keep Heat Safety Training Records on File
- ☐ Update OSHA Logs if Heat-Related Incidents Occur
- ☐ Ensure Compliance with State/Local Heat Illness Regulations
The Fleming Construction Group – Your Safety-First Construction Partner
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