Working outdoors on construction sites during hot weather puts operatives at risk of heat-related illness. Heat exhaustion can develop quickly and, if untreated, progress to heat stroke which is a life-threatening medical emergency. This talk explains how to recognise the symptoms, what actions to take, and the preventive measures that keep the workforce safe in warm conditions.
Key Hazards
Heat stroke causing loss of consciousness, seizures, or death
Dehydration reducing concentration and increasing accident risk
Heavy PPE trapping body heat and accelerating overheating
Prolonged sun exposure causing burns and worsening heat illness
Control Measures
Provide free access to cool drinking water at all times and encourage regular hydration.
Schedule physically demanding tasks for cooler parts of the day such as early morning.
Provide shaded rest areas where workers can cool down during breaks.
Monitor workers for early symptoms of heat illness including headache, dizziness, and nausea.
Allow additional rest breaks during periods of high temperature and humidity.
Ensure supervisors are trained to recognise and respond to heat exhaustion and heat stroke.
Use cooling towels or neck wraps where provided and remove unnecessary layers of PPE when safe.
Rotate workers on physically demanding tasks to reduce individual heat exposure time.
Brief the workforce each morning when hot weather is forecast so everyone understands the risks.
Emergency / Rescue
If a worker shows signs of heat stroke — hot dry skin, confusion, or collapse — call 999 immediately. Move them to a cool area, remove outer clothing, and cool them with wet cloths while awaiting the ambulance.
Remember
Drink water regularly throughout the day and do not wait until you feel thirsty
Heat exhaustion symptoms include headache, nausea, dizziness, and heavy sweating
Heat stroke is a medical emergency requiring an immediate 999 call without delay
Schedule heavy physical work for the coolest part of the day whenever possible
Supervisors must monitor the workforce closely during hot weather conditions on site
Applicable Legislation: Health and Safety at Work etc. Act 1974 · Management of Health and Safety at Work Regulations 1999 · Workplace (Health, Safety and Welfare) Regulations 1992