Safety checklist — Hot weather work
Prevention of heat stroke on site. Compliant with Québec's Construction Safety Code (CSTC) and CNESST standards.
Before the workday
11 items- ✓
Humidex / corrected temperature checked (CNESST tool)
- ✓
Fresh drinking water in sufficient quantity on site
- ✓
Shade area or shelter available for breaks
- ✓
Strenuous tasks scheduled for cooler hours (early morning)
- ✓
Team informed of heat stroke symptoms
- ✓
First aid kit accessible
- ✓
Drink 250 ml water every 20 min (max 1.5 L/h)
ℹ️ At 41.7°C+: drink 250 ml every 10 min (max 1.5 L/h)
- ✓
Shade breaks per CNESST work-rest schedule
- ✓
Buddy system — mutual monitoring between colleagues
- ✓
Light, pale, breathable clothing under PPE
- ✓
Watch for signs: cramps, dizziness, unusual fatigue
End of heat period
3 items- ✓
Any discomfort reported and documented
- ✓
If confusion, loss of balance or consciousness: call 911
- ✓
Affected person moved to shade and cooled while awaiting help
More checklists — Cross-cutting Situations
More safety checklists
Risks and prevention — Hot weather work
Heat stroke can be fatal and develops quickly during intense physical labour. CNESST recommends preventive measures when WBGT or Humidex reach critical thresholds. Workers most at risk are those not acclimatized, on medication, or wearing heavy PPE.
Measures include: constant access to cool water, shade or air-conditioned rest breaks, work-rest cycles adapted to physical load and temperature, and training workers to recognize signs (confusion, hot dry skin, nausea). An emergency plan with emergency service contacts must be posted.
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