Flat Roofs Types for Canadian Commercial Buildings

When you start thinking about a roofing system for a commercial or industrial building in Canada, it doesn’t take long to realise it’s not a simple choice. Our weather swings between snow, rain, ice, warm days, sudden freezes, and then everything repeats. Flat roofs take most of that impact, so choosing the right one matters a lot more than people think.

That’s why many owners and building managers try to understand the different flat roofs before making any big decision. Once you get a clear picture of how each roofing system behaves in our climate, planning repairs or replacements feels a lot less confusing.

Crown Industrial Roofing has been working in Toronto and nearby areas for years, and we’ve seen what works and what fails. So, let’s go through the flat roofing systems that are commonly used in Canada and why they fit our weather.

What Are the Different Flat Roofs Types Used in Canada?

Commercial buildings across the country usually rely on low-slope or flat roofing systems made to handle snow loads, drainage challenges, and the temperature swings we’re used to.

The most common ones are:

• Built-up roofing (BUR)

• Modified bitumen systems

• EPDM, TPO, and PVC single-ply membranes

• Green or reflective roofing options

  
  

Each one has its own strengths depending on the size of the building, how often the roof gets walked on, and how much maintenance you’re planning to do over the years.

Built-Up Roofing (BUR): A Durable, Time-Tested Choice

Many older commercial and industrial buildings in Canada still have built-up roofing. It's made using several waterproof layers topped with gravel. Because it’s heavier than other roofing types, it holds up well in winter storms and windy areas.

Some reasons people stick with BUR:

• Very good protection against leaks

• Handles snow and wind well

• Long service life with proper upkeep

It’s a solid option if your building can support the extra weight and you want something proven over decades.

Modified Bitumen Roofing: Ideal for Freeze-Thaw Conditions

Modified bitumen roofing is used a lot here simply because it handles freeze-thaw cycles better than many other materials. This type of roof bends a little rather than cracking when the temperature suddenly changes.

Why people like it:

• Tough and resistant to damage

• Heat-welded seams help stop leaks

• Works well on roofs that need regular access

So if you have HVAC systems, vents, or equipment on the roof that people need to check often, this system makes sense.

Single-Ply Flat Roofing Types: EPDM, TPO, and PVC

Single-ply roofs are common on newer commercial buildings. They weigh less, and installation is usually faster.

Roofing Type	Main Benefit	Best Use Scenario
EPDM	Flexible and handles cold weather	Bigger buildings, and industrial roofs
TPO	Reflective helps reduce heat	Shopping centres and offices
PVC	Great against chemicals and grease	Restaurants, healthcare, and industrial kitchens

These systems can also be combined with better insulation, which helps with energy costs in both winter and summer.

Green and Reflective Roofing Surfaces

Energy efficiency is becoming a priority for more properties in Canada. Green roofs and reflective materials help reduce heat and even support environmental goals.

Examples include:

• Living/vegetated roofs

• Reflective or white membranes

• Cool roof coatings

These designs help reduce heat buildup in summer, manage water run-off, and extend the life of waterproof layers, especially with regular maintenance.

What Is the Best Type of Flat Roof for the Canadian Climate?

There’s no one-size-fits-all roofing system. The best option for your building depends on several important factors, such as:

• The lifespan you expect from your roof

• Your insulation and energy needs

• How well the roof must handle snow load and drainage

• How frequently people will access the roof

With expert guidance, it becomes much easier to choose a roofing system that delivers the right mix of durability, cost-effectiveness, and performance. Crown Industrial Roofing helps building owners understand their structure’s needs and select a long-term solution they can rely on.

Choosing a Roofing Partner Matters

Even the strongest roofing material won’t do its job if it’s installed poorly or ignored afterwards. Routine checks, leak prevention, caulking, inspections, infrared scans, and basic repairs make a big difference in how long a roof lasts.

Crown Industrial Roofing offers full services, including installation, maintenance, replacement, and 24/7 emergency repairs, and the aim is always the same: to make sure your flat roof can handle Canadian weather without constant problems.

Conclusion

Every commercial building is different, and learning about flat roofs types helps owners and managers make better choices for long-term protection. A good flat roof can help prevent leaks, reduce future repair costs, and protect the building through all seasons.

Crown Industrial Roofing provides trusted flat roofing services across Toronto.

If you’re ready, book your professional inspection  with Crown Industrial Roofing — Toronto’s reliable commercial flat roofing team.