What should you look for when choosing a TPO roofing membrane for a commercial project?

For commercial roofing, choosing a TPO membrane is about more than comparing thickness, price or basic material specifications. A roofing membrane needs to perform consistently under different weather conditions, remain watertight over time, and meet the performance requirements of the project.

This is where EN standards become important.

European Norms provide a common framework for evaluating roofing and waterproofing materials. For designers, contractors and building owners, these standards offer clearer benchmarks when comparing different products and assessing whether a membrane is suitable for a specific roofing application.

For TPO roofing membranes, EN 13956 is one of the key standards to understand. It covers flexible sheets for waterproofing and specifies requirements related to properties such as tensile strength, elongation, tear resistance and dimensional stability.

These properties are not simply numbers on a technical datasheet. They can have a direct impact on how a membrane performs during installation and throughout its service life.

Resistance to weather and UV exposure

Commercial roofs are continuously exposed to sunlight, temperature changes, rain and other environmental factors. Over time, these conditions can affect the physical properties of roofing materials.

Testing related to UV exposure, heat aging and chemical resistance helps provide a better understanding of how a TPO membrane can maintain its performance under long-term environmental stress.

Fire performance matters too

For commercial buildings, fire safety is an important part of roofing system design. Relevant EN fire classification standards provide methods for evaluating how roof coverings perform when exposed to external fire conditions.

This is particularly important when roofing systems are used on large commercial, industrial or public buildings where safety requirements can be more demanding.

Watertightness depends on the complete system

The primary purpose of a waterproofing membrane is, of course, to keep water out. EN 1928 provides a test method for evaluating watertightness, but the performance of the finished roof also depends heavily on installation quality.

Substrate preparation, membrane positioning, heat welding and seam inspection all play an important role. Even a high-performance membrane needs properly executed joints and details to create a continuous waterproofing layer.

Energy efficiency and sustainability are also becoming more important

For many commercial buildings, roofing performance is increasingly connected with overall building energy performance. Solar reflectivity and thermal emissivity can influence how much heat a roof absorbs, which may affect cooling demand in certain climates.

For projects with green building or sustainability targets, these characteristics can therefore become part of the material selection process alongside mechanical and waterproofing performance.

And standards should not only be considered after a product has been selected.

Before installation, project teams can review technical documentation, product specifications and relevant test data to make sure the membrane matches the requirements of the roofing system. During construction, following appropriate installation procedures is equally important for achieving the expected performance.

In commercial roofing, material selection and installation quality go hand in hand.

Understanding the standards behind TPO roofing membranes gives project teams a more practical basis for comparing products, evaluating performance and making decisions that are better suited to the actual conditions of the roof.

At CANLON, we continue to develop roofing and waterproofing solutions with a focus on performance, durability and the requirements of real-world roofing projects.