CN Tower Maintenance: How Engineers Keep Canada’s Iconic Skyscraper Safe

Maintenance Wonders of the World

CN Tower Maintenance

Every time a visitor from out of town heads to Toronto, the CN Tower is the must‑see attraction. I’ve taken the ride up the tower dozens of times, and each visit reminds me why this 37‑year‑old steel and concrete marvel still captivates so many. Whether it’s the panoramic view of the city lights, the sunset glow, or the view through the 64 mm glass floor, the experience is unforgettable. But what lies behind that awe‑inspiring view is a relentless dedication to safety and performance by the tower’s maintenance team.

Over the years I’ve become fascinated by the construction and, more importantly, the day‑to‑day maintenance of the CN Tower. The question that has driven my curiosity is: What challenges do the engineers and technicians face in keeping this iconic structure standing strong for more than three decades?

The CN Tower’s maintenance crew tackles a series of daunting challenges, but they’ve turned obstacles into award‑winning solutions through teamwork, advanced technology, and a culture of continuous improvement.

CN Tower Facts & Figures

• Total height: 553.33 m (1,815 ft)
• Total mass: 118,000 metric tonnes
• Three major sub‑structures, including visitor areas at 346 m (1,135 ft) and 446.5 m (1,465 ft)
• Six elevators, 1,776 steps, and extensive power & plumbing runs through the hexagonal base
• Main support pillar built with a hydraulically‑raised slipform
• Continuous concrete pouring by 1,532 workers until 22 Feb 1974
• Topped off on 2 Apr 1975 after 26 months of construction
• 40,500 cubic metres (52,972 cu yd) of concrete in total
• Vertical accuracy maintained by plumb‑bobs and telescopic observation; deviation < 29 mm over the entire height

And, of course, a world‑class rotating restaurant that’s as famous for its food as it is for its engineering.

CN Tower’s Megalithic Achievements

Team Development. André Saker, director of Facilities and Engineering, stresses that ownership of tasks keeps the crew motivated and cohesive. A prime example is the in‑house‑developed control system that monitors the tower’s pumping systems, logs capacity, and predicts failures. Real‑time notifications are routed 24/7 to technicians via the CMMS.

Waste Reduction. The tower’s environmental committee champions waste reduction and energy conservation. With over 1.5 million visitors annually, the CN Tower achieves a diversion rate of 60%—10% above the world‑class benchmark—equating to more than 400 tonnes of waste diverted each year. Their water and electricity strategy cuts monthly consumption by over 52 MWh, and the LED relighting of the tower reduces energy use by 60% compared to the 1990s lighting.

Effective Preventive Maintenance. Since 2005, a computerized maintenance management system (CMMS) has been integral to the tower’s operations. The CMMS facilitates work requests, task prioritization, and preventive maintenance scheduling for critical systems, including the motors that drive the rotating restaurant. Every critical system has a detailed procedure stored within the CMMS.