What is Torch On Roofing?

If you’re looking for a durable and weather-resistant solution for your flat or low-slope roof, torch on roofing is one of the most reliable systems available. Popular across Canada — especially in regions like Montreal and the South Shore — torch-on membranes are ideal for buildings that need protection from harsh winters, heavy rain, and freeze-thaw cycles.

In this complete guide, we’ll answer common questions like what is torch on roofing, how long does torch on roofing last, and how much does torch on roofing cost, while breaking down the pros, cons, and structure of this high-performance flat roofing system.

What Is Torch On Roofing?

Torch on roofing, also called elastomeric membrane, is a multi-layer roofing system made from modified bitumen. The name comes from the installation method: a propane torch is used to heat and bond the material to the roof surface, ensuring a watertight seal.

The system typically includes:

• A base sheet mechanically fastened or adhered to the substrate
• A cap sheet with a granular surface, torched directly onto the base sheet

This torch on roofing material is engineered to withstand extreme temperature fluctuations, UV radiation, and standing water, making it an excellent choice for flat roofs in Quebec.

Why Choose Torch On Roofing?

Torch-on systems have earned their reputation for reliability and performance, particularly on commercial and industrial buildings. Here’s why:

Advantages:

• Long-lasting protection (20–30 years with proper maintenance)
• Waterproof seal that resists ponding water
• Highly resistant to tears, punctures, and UV exposure
• Fire-resistant top layer with granules
• Performs well in cold climates

Drawbacks:

• Installation requires skilled professionals due to open-flame torches
• Slightly higher cost than basic single-ply systems
• Not suitable for DIY projects

At Les Couvreurs Duro-Toit, all our installers are certified and trained to follow safety standards during torch-on membrane installations.

How Long Does Torch On Roofing Last?

One of the top reasons building owners choose this system is its longevity. On average, torch on roofing lasts between 20 to 30 years, depending on factors like:

• Quality of materials used
• Installation technique
• Roof maintenance and drainage
• Exposure to extreme weather

Some higher-end systems, when properly installed and maintained, can even exceed 30 years. Routine inspections, debris removal, and minor repairs help extend the lifespan significantly.

How Much Does Torch On Roofing Cost?

The cost of a torch on roof can vary depending on the size of your building, material type, insulation needs, and local labor rates. On average in Quebec, torch on roofing costs between $10 and $15 per square foot (installation included).

A breakdown of cost factors:

• Size and complexity of the roof surface
• Number of layers (base + cap sheet, insulation, vapour barrier)
• Roof access and safety requirements
• Removal of old roofing (if needed)

For a typical 1,500 sq. ft. commercial roof, the cost might range from $15,000 to $22,500. At Duro-Toit, we provide free quotes and detailed estimates to help you plan your investment with full transparency.

Torch On Roofing vs. Other Flat Roofing Materials

How does torch on roofing material compare with other common flat roof options like EPDM, TPO, or PVC?

Torch-on is often preferred when durability, waterproofing, and cold-weather performance are top priorities.

Maintenance Tips for Torch On Roofs

Although torch-on membranes are low maintenance, annual inspections are essential to keep your roof in optimal condition.

Recommended maintenance:

• Clear debris and leaves that can trap moisture
• Check for standing water after heavy rain
• Inspect seams and flashings for wear or cracks
• Re-seal penetrations (vents, HVAC units) as needed

Is Torch On Roofing Right for You?

Torch-on roofing is ideal for:

• Commercial and industrial flat roofs
• Condo and apartment buildings
• Residential flat or low-slope roofs that require durability

Whether you’re replacing an old roof or starting a new project, torch-on membranes offer reliable protection, long-term value, and excellent performance in harsh climates.

Work with Montreal’s Torch On Roofing Specialists

At Duro-Toit, we’ve been installing and maintaining torch on roofs across Montreal and the surrounding regions for decades. Our certified team ensures each project is installed to the highest standards — safely, efficiently, and with lasting results.

Need a new flat roof or considering switching to torch on roofing? Contact us today for a free quote and expert advice. We’ll help you choose the right system, plan your project, and make sure your building is protected for years to come.