Choosing the right flat roof materials is crucial for the longevity and performance of your commercial property.
Selecting the appropriate materials not only protects your investment but also enhances energy efficiency and reduces maintenance costs. In this article, you will learn:
- Key factors to consider when choosing flat roof materials.
- The best flat roof materials for commercial properties.
- Case studies of successful flat roof projects.
Why Quality Roofing Materials Matter for Flat Roofs
Flat roofs are a popular choice for commercial properties due to their sleek design and efficient use of space. Unlike pitched roofs, flat roofs provide additional usable space for HVAC units, solar panels, and even rooftop gardens.
However, their unique structure brings specific challenges that necessitate high-quality roofing materials to ensure durability and performance.
One of the primary challenges flat roofs face is water drainage. Unlike pitched roofs, flat roofs do not naturally facilitate water runoff, which can lead to pooling and potential water damage if not properly managed. This makes the selection of waterproof and durable materials crucial.
Another significant challenge is thermal expansion and contraction. Flat roofs are more exposed to temperature fluctuations, which can cause materials to expand and contract, leading to cracks and leaks over time.
That’s why quality roofing materials matter as they are designed to withstand these fluctuations and maintain their integrity.


Key Considerations for Choosing Flat Roof Materials
When selecting materials for your flat roof, several factors should guide your decision. Here are the key considerations to keep in mind:
- Energy Efficiency: Opt for materials that reflect sunlight and reduce heat absorption, such as Built-Up Roofing (BUR) with reflective coatings, to lower energy costs.
- Durability and Longevity: Your roof needs to withstand the elements and heavy foot traffic. Materials like 2-ply modified bitumen and 4-ply BUR offer excellent durability (see chart below).
- Maintenance Requirements: Consider the ease of maintenance. Some materials may require more frequent inspections and repairs than others.
- Installation Costs: Budget is always a concern. While some materials might be cheaper upfront, they could incur higher maintenance costs over time.
- Environmental Impact: Sustainable materials, like those offered by companies committed to eco-friendly practices, can reduce your property’s carbon footprint.
Top Flat Roof Materials for Commercial Properties
Material | Pros | Cons | Ideal Use Cases |
---|---|---|---|
EPDM (Ethylene Propylene Diene Monomer) | • Long lifespan (20-30 years) • Excellent resistance to UV rays and weathering • Easy installation and repair | • Limited color options (mostly black) • Can be prone to punctures | • Large commercial buildings • Warehouses • Facilities in regions with moderate weather conditions |
TPO (Thermoplastic Olefin) | • High energy efficiency due to reflective surface • Resistant to UV rays, ozone, and chemical exposure • Available in various colors | • Can be more expensive than EPDM • Requires skilled installation | • Buildings seeking LEED certification • Properties in hot climates (i.e., not recommended for Canadian roof tops) • Industrial facilities needing chemical resistance |
PVC (Polyvinyl Chloride) | • Highly durable and long-lasting • Excellent fire resistance • Great for roofs with exposure to chemicals and oils | • Can be more expensive than TPO and EPDM • Environmental concerns due to plastic content | • Restaurants and food processing plants • Buildings with extensive rooftop equipment • Facilities in areas with high fire risk |
Modified Bitumen | • Proven durability and reliability • Excellent waterproofing properties • Multiple layers for enhanced protection | • Heavier than single-ply systems • Can be more labor-intensive to install | • Older buildings needing retrofits • Properties in regions with heavy rainfall • Industrial buildings (e.g., Food Processing Facilities) |
Built-Up Roofing (BUR) | • Excellent protection against water and weather • Long lifespan when maintained properly • Multiple layers for superior durability | • Heavy and requires robust structural support • Longer installation time | • Large commercial buildings • Properties in harsh weather climates (i.e., great against Canada’s weather) • Facilities needing extra insulation |
Case Studies of Successful Flat Roof Installations
Case Study 1: Flat Roof Replacement in Vaughan
Project Overview:
In Vaughan, Ontario, a commercial building owner needed a solution for a leaky, 30-year-old flat roof. We replaced the aging roof with a modern, durable, and energy-efficient roofing system.
Results: The new 4-ply BUR system provided enhanced durability, improved energy efficiency, and water damage prevention. The project included a 10-year warranty, ensuring long-term protection for the building owner.
Case Study 2: Flat Roof Replacement in St. Catharines
Project Overview: A commercial building in St. Catharines had a 50-60 year old flat roof with water ponding issues. We replaced it with a Built-Up Roofing (BUR) system and improved drainage.
Results: The new BUR system ensured enhanced durability and effective water drainage, preventing future damage and increasing the property’s value.
Case Study 3: Re-Roofing in Brampton
Project Overview: A business in Brampton faced escalating repair costs and leaks from an aging roof. We installed a 5 Ply Built-Up Roof (BUR) system to provide a durable solution.
Results: The new 5 Ply BUR system eliminated ongoing repair costs and included additional skylights for improved lighting. The project was backed by a 20-year warranty, ensuring long-term reliability.
Behind the scenes of a flat roof replacement:
Does your flat roof use the right materials?
Choosing the right flat roof materials for your commercial property is essential for ensuring durability, energy efficiency, and long-term performance.
By considering factors like durability, energy efficiency, and maintenance requirements, you can make an informed decision that protects your investment.
For more information on maintaining and optimizing your commercial roof, check out our preventative roof maintenance plans.
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