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**Safety**·December 30, 2025· 4 min read
# **Top 5 Construction Safety Hazards and How to Prevent Them**
Falls, struck-by incidents, electrocution, caught-in hazards, and trench collapses form construction's 'Fatal Five.' Learn how to identify and eliminate each risk on your job site.
**AVANORTH**
AVANORTH Construction
## The Fatal Five: Understanding Construction's Deadliest Hazards
Construction is one of the most dangerous industries in Canada. Year after year, workplace injury statistics reveal the same five hazard categories responsible for the majority of serious injuries and fatalities. Understanding these hazards and implementing effective controls is not just good practice. It is a legal obligation and a moral responsibility.
## 1. Falls from Height
Falls account for the largest share of construction fatalities. Workers fall from scaffolding, ladders, roofs, and unprotected edges of elevated work platforms.
### Prevention Measures
- Install guardrails on all elevated platforms and open edges above 3 metres
- Use personal fall arrest systems (harness, lanyard, anchor) when guardrails are not feasible
- Train workers in proper ladder use: maintain three-point contact, do not overreach
- Cover all floor openings with secured covers rated for expected loads
- Develop a site-specific fall protection plan before work begins
## 2. Struck-By Incidents
Workers are struck by falling objects, swinging loads, moving vehicles, and rolling materials. On active sites with overhead crane operations, this risk is constant.
### Prevention Measures
- Establish exclusion zones beneath overhead work and crane operations
- Require hard hats at all times on active construction sites
- Secure tools and materials at height with lanyards and toe boards
- Use spotters and audible alarms when operating heavy equipment near workers
- Maintain clear sight lines and defined pedestrian pathways separate from vehicle routes
## 3. Electrocution
Contact with overhead power lines, live circuits in existing buildings, and improper use of temporary power systems cause serious electrical injuries on construction sites.
### Prevention Measures
- Identify all electrical hazards during the pre-construction site assessment
- Maintain safe distances from overhead power lines (minimum 3 metres for lines under 750V)
- Use ground fault circuit interrupters (GFCIs) on all temporary power outlets
- Lock out and tag out electrical systems before any work on or near live circuits
- Ensure only licensed electricians perform electrical installations and connections
## 4. Caught-In or Between Hazards
Workers can be caught in unguarded machinery, pinched between equipment and structures, or trapped in collapsing trenches and excavations.
### Prevention Measures
- Guard all moving parts on machinery, including belts, gears, and rollers
- Never enter an unprotected trench deeper than 1.2 metres without shoring, sloping, or trench boxes
- Use lockout/tagout procedures when servicing or maintaining equipment
- Keep body parts clear of pinch points between moving equipment and fixed structures
- Wear properly fitted clothing that cannot be caught in rotating parts
## 5. Trench and Excavation Collapses
Trench cave-ins can bury workers in seconds, and the weight of collapsed soil makes rescue extremely difficult. One cubic metre of soil weighs approximately 1,500 kilograms.
### Prevention Measures
- Classify soil type before excavation to determine proper protection methods
- Install trench boxes, hydraulic shoring, or slope walls to safe angles based on soil type
- Keep spoil piles and heavy equipment at least 1 metre from trench edges
- Place ladders within 7.5 metres of any worker in a trench for emergency egress
- Inspect trenches daily and after any rainfall, vibration, or other event that could affect stability
## Building a Safety Culture
Preventing these hazards requires more than just equipment and rules. It requires a culture where every person on site feels empowered to stop work when something is unsafe. Effective safety cultures share these traits:
- Daily toolbox talks that address site-specific hazards
- Supervisors who lead by example with proper PPE use and safe work practices
- A non-punitive reporting system for near-misses and hazard observations
- Regular site inspections with documented corrective actions
- Ongoing training that goes beyond the minimum legal requirements
## AVANORTH's Commitment
At AVANORTH, safety is not a department. It is a core value shared by every member of our team. We invest in training, equip our sites with proper protection systems, and hold each other accountable for maintaining the standards that keep everyone going home safely at the end of every day.
#safety #hazards #prevention
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