EPDM roofing is renowned amongst DIYers and commercial installers alike for its incredible waterproofing ability and long-term durability, making it one of the most trusted materials for flat and low-slope roofs in commercial and residential projects.
In this article, we will explore why EPDM rubber is waterproof, what an EPDM waterproofing membrane is, and answer the common question: how strong is EPDM?
What is EPDM Waterproofing Membrane?
EPDM is a synthetic rubber with a wide range of applications; its durability, weather resistance and ease-of-installation have established it as the go-to roofing system for those looking for reliability and longevity.
When people ask, "What is EPDM waterproofing membrane?", they are referring to sheets of EPDM that are used to cover and protect roofs from weather damage.
An EPDM waterproofing membrane is flexible, UV-resistant, and highly effective at preventing water ingress. It can come in various thicknesses, most commonly 1.2mm (045) to 1.52mm (060), with the thickness adding additional resistance and durability. We always recommend that for commercial properties, or properties that may encounter more hazards (e.g. debris) that the thicker membrane is used.
EPDM is widely available in large rolls to create as few seams as possible during installation, further reducing margins for error. Fewer seams mean fewer weak points, contributing massively to its waterproofing characteristics.
Is EPDM Rubber Waterproof?
The short answer to "Is EPDM rubber waterproof?" is yes, extremely so. EPDM’s chemical composition allows it to repel water naturally, without needing additional waterproof coatings. Unlike some roofing materials that can crack or degrade over time under constant exposure to moisture, EPDM maintains its integrity even after years of rain, snow, and freeze-thaw cycles.
Its resistance to water isn’t just surface-level either: EPDM remains impermeable throughout its thickness. That means that even if the top layer experiences minor wear, the membrane beneath continues to provide protection. This deep, built-in waterproofing is one of the reasons EPDM roofs can often last upwards of 50 years when properly installed.
How Strong is EPDM?
Durability is just as important as waterproofing, and many wonder, "how strong is EPDM?" EPDM is impressively strong due to its elastic yet tough nature. It can stretch up to 300% of its original size without tearing, which makes it particularly good at handling building movements, thermal expansion, and even minor structural shifts without cracking.
In addition to its elasticity, EPDM resists punctures, UV radiation, extreme temperatures, and chemical exposure far better than many alternative roofing materials. This combination of flexibility and resilience ensures that EPDM roofs not only stay waterproof but also remain structurally sound in challenging conditions over long periods.
Conclusion
EPDM roofing owes its waterproof and durable reputation to its unique material properties, and our TRC Techno EPDM Membrane is no different. If you’re asking, "Is EPDM rubber waterproof?" the answer is a resounding yes, thanks to its natural water resistance and robust membrane structure. Its long life span, low maintenance needs, and proven reliability make EPDM an investment that stands the test of time.
Our TRC Techno EPDM Membrane comes with a 20-year downloadable product warranty. We also provide a variety of training resources, including:
If you're looking for a long-lasting, cost-effective, and eco-friendly flat roofing system, EPDM is the ultimate choice.
