Safety checklist — Hot weather work
Prevention of heat stroke on site. Based on 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
- ✓
Hydration per the CNESST heat guide / the risk assessment
ℹ️ The 250 ml / 20 min table (or 10 min at 41.7°C+) is a CNESST guide, not a CSTC article.
- ✓
Shade breaks per the CNESST work-rest guide
ℹ️ Work-rest schedule: CNESST guide, not a CSTC article. LSST 51: eliminate the hazard.
- ✓
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
14 verification items — use this checklist on-site with the app
Use on-site — freePDF reports, history and team management in the app
For information only — this is not legal advice. OK Sécurité is an independent company with no affiliation to the CNESST: we are not mandated, endorsed or certified by it. Completing a checklist here does not by itself establish your compliance — your exact obligations depend on your job site and your prevention program. Where there is any discrepancy, the official text published by Légis Québec or the CNESST prevails.
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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