January brings some of the most unpredictable weather of the year, with freezing fog one week and chinooks the next. These rapid temperature swings create serious challenges for equipment, building materials, and mechanical systems on worksites. Recently in Calgary, we have seen another major water main break occur after a 30+ degree temperature swing, adding more cost to an already 50-million-dollar project. Understanding how temperature affects materials is the first step in preventing costly failures.
Why Temperature Swings Matter
All materials naturally respond to temperature changes. When temperatures drop, materials contract. When temperatures rise, they expand. Under stable conditions, this expansion and contraction will happen slowly and predictably. However, when temperatures shift quickly, materials are forced to change size faster than they can safely handle. This creates thermal stress, an internal pressure that weakens components over time and accelerates wear of equipment.
Extended periods below –20°C can wreak havoc on mechanical systems, both in homes and on worksites
- Warps, cracks, or fatigues metal components
- Loosens bolts, fasteners, and structural joints
- Makes hydraulic and pneumatic lines brittle
- Increases friction and strain on moving parts
- Leads to sudden equipment or system failures
- Damages building materials such as roofing, siding, concrete, and asphalt
- Cold snaps stiffen steel, tighten cables, thicken lubricants, and weaken batteries.
- Mechanical systems (from furnaces to overhead doors) struggle when temperatures swing 30°C or more in a short period.
When temperatures rise again, everything expands freely and oftentimes unevenly. That uneven movement is what causes buckling, bowing, cracking, and premature breakdowns. These can lead to further issues such as loss of essential services like water and heat and can allow for increased exposure to the elements.
Thermal stress is unavoidable in environments with large temperature fluctuations, but with proper preparation and maintenance, it can be significantly reduced.
Reducing Thermal Stress
Ensure Proper Insulation
Keeping equipment at a stable temperature is one of the most effective ways to reduce stress and extend service life.
- Insulate machinery exposed to the elements.
- Pay special attention to hydraulic and pneumatic lines, which are highly sensitive to temperature changes.
- Seal gaps in equipment housings to prevent cold air intrusion
Proper insulation reduces energy consumption and helps equipment operate smoothly in both cold and warm conditions.
Use Battery Tenders & Engine Heaters
Equipment with electric ignition systems or large internal combustion engines are especially vulnerable to cold weather.
- Use block heaters or battery tenders overnight or during long breaks.
- Prevent cold‑start issues caused by thick oil and weak batteries.
- Reduce downtime and avoid unnecessary strain on engines.
Following these steps can help prevent cold‑start failures and extend engine life.
Regularly lubricate all moving parts.
Temperature swings can cause lubricants to thicken, thin, or break down. Proper lubrication reduces friction, prevents premature wear, and keeps machinery running efficiently.
- Keep components properly lubricated
- Inspect seals and gaskets. Dried or cracked seals accelerate lubricant breakdown
- Use lubricants rated for the temperature range your equipment will face.
- Store lubricants indoors so they remain at usable temperatures
Watch for Plugged Exhausts & Intakes
Rapid warming after extreme cold can create condensation, melting snow, and slush that can block furnace exhausts, boiler vents, water heater intakes. These steps can help prevent unsafe operating conditions, reduce the risk of carbon monoxide buildup, and cause fewer unexpected shutdowns.
- After a warm‑up or chinook, inspect all exhaust and intake points for slush, ice, or debris.
- Install elevated or shielded vent covers to prevent snow accumulation.
- Add mesh screens to prevent ice chunks from entering intake openings.
- Clear pathways around vents daily during freeze–thaw cycles.
- Train workers to recognize signs of blocked vents (slow heating, unusual smells, equipment shutting off
Protect Building Materials from Expansion & Contraction
Large temperature variations can damage structures over time:
- Roofing and siding may buckle, bow, or crack. Inspect roofing, siding, and exterior cladding after major temperature swings.
- Apply sealants and caulking designed for wide temperature ranges to prevent cracking
- Repair small cracks immediately
- Keep snow and ice cleared from roofs to reduce freeze–thaw stress.
- Concrete and asphalt degrade faster during freeze–thaw cycles.
- Steel structures expand and contract unevenly, stressing joints and fasteners.
- Plan inspections after major temperature swings to catch early signs of damage
Final Thoughts
By insulating equipment, monitoring material conditions, and conducting regular inspections after major weather shifts, you can identify issues before they escalate. These simple steps help prevent breakdowns, reduce repair costs, and keep operations running smoothly all winter long