Summer is peak season for work at heights in Canada — roofing, framing, steel erection, telecom, and solar crews are all busiest between June and September. It's also the season when heat quietly stacks new risks on top of the fall hazards you already manage every day.
A worker in full fall arrest gear on a dark roof deck in 30°C weather is dealing with far more than the height. Here's how heat changes the job — and how to keep your crew safe, compliant, and productive through the hottest months.
1. Heat Stress Hits Harder in a Harness
A full-body harness, work boots, hard hat, and hi-vis layers all trap heat and restrict airflow exactly where your body needs to shed it. Add exertion and direct sun, and core temperature climbs fast. Dizziness, cramps, and slowed reaction time are early heat-stress symptoms — and at height, a moment of impaired judgment can be the difference between a near-miss and a fall.
- 💧 Hydrate on a schedule, not by thirst — small amounts of water every 15–20 minutes
- ⏱️ Build work-rest cycles into the day and shift heavy tasks to mornings
- 👕 Choose breathable layers and lighter-weight harnesses with padding that wicks rather than soaks
- 👀 Use a buddy system — heat illness is easier to spot in a coworker than in yourself
2. Sun and Heat Age Your Gear Faster
⚠️ UV is a slow-motion hazard for synthetic webbing
Prolonged sun exposure degrades the polyester and nylon webbing in harnesses and lanyards — look for fading, stiffness, or a chalky surface. Heat makes it worse: the inside of a work truck or job box parked in the sun can exceed 60°C, accelerating breakdown of webbing, stitching, and energy absorbers.
In summer, inspect more often and store smarter: keep gear out of direct sun when not in use, hang it in a ventilated area instead of the truck dash, and take any component with UV damage out of service. Our field guide to inspecting fall protection equipment walks through exactly what to look for.
3. Sweat Changes Fit and Grip
A harness that fit perfectly in April rides differently over a soaked t-shirt in July. Sweat-slick hands compromise grip on ladders, rails, and rope grabs, and sweat in the eyes at the wrong moment is its own hazard. Re-check harness fit at midday, snug leg and chest straps after breaks, and keep sweatbands, cooling towels, and spare gloves in the rotation. A properly fitted harness isn't just comfort — in a fall, loose straps concentrate arrest forces where they shouldn't be.
4. Hot Surfaces Are a Contact Hazard
Dark metal roofing, membrane roofs, and steel structures can reach surface temperatures of 60–70°C or more under summer sun — hot enough to burn skin on contact and soften some membrane surfaces underfoot. Plan anchor locations and travel paths with surface heat in mind, wear gloves rated for the work, and be cautious kneeling or bracing against sun-baked surfaces during connection and disconnection.
5. Heat Is a Compliance Issue, Too
Every Canadian jurisdiction imposes a general duty on employers to protect workers from hazardous conditions — and heat qualifies. Several provinces publish humidex-based guidance for outdoor work, and regulators increasingly expect heat-stress planning alongside your fall protection plan: shaded rest areas, water access, acclimatization for new workers, and modified schedules on extreme days. If your fall protection plan doesn't mention heat, summer is the time to fix that. For the fall protection side of the ledger, see our overview of fall protection requirements every Canadian employer needs to know.
Quick Summer Checklist for Crews at Heights
- ☑️ Water, shade, and scheduled breaks planned before the shift starts
- ☑️ Harnesses and lanyards inspected for UV fading, stiffness, and heat damage
- ☑️ Gear stored out of direct sun and hot vehicles
- ☑️ Harness fit re-checked midday; heavy tasks scheduled for cooler hours
- ☑️ Heat-stress response (signs, first aid, emergency plan) reviewed with the crew
🦺 Gear Up for a Safe Summer Season
From breathable, padded full-body harnesses to SRLs, lanyards, and complete roofer's kits — everything ships fast from Paris, Ontario, with no cross-border duties or delays.
Work at heights doesn't pause for a heat wave — but with the right planning, gear, and inspection habits, your crew can get through the hottest stretch of the season without trading one hazard for another.