EPDM vs PVC Waterproofing: What You Should Know?

Written By Adam Paul - Waterproofing Expert

EPDM waterproofing and PVC waterproofing are two types of most used waterproofing membranes, which are used to protect buildings from water and moisture penetration. In order to choose the right type of the waterproofing membrane, you should know the differences between them before you apply. 

So as waterproofing experts, Aqviz, we prepared a complete comparison guide by considering the EPDM vs PVC waterproofing.  We have included main differences in material composition, water resistance, breathability, flexibility, chemical resistance, and UV resistance. As minor differences, we included adhesion, tear resistance, seam integrity, root penetration resistance, eco-friendliness, fire resistance, anti-slip resistance, toxicity and self-expanding capability. 

Material Properties Comparisons Between EPDM and PVC Waterproofing

These are the material composition, performance, durability, and environmental resistance comparisons between EPDM and PVC waterproofing

1. EPDM waterproofing membranes are made from synthetic rubber membrane, while PVC (Polyvinyl Chloride) waterproofing is made from thermoplastic membrane.
2. EPDM and PVC waterproofing both have excellent water resistance
3. EPDM waterproofing is more flexible than PVC waterproofing
4. EPDM waterproofing has a lower chemical resistance than PVC waterproofing
5. EPDM waterproofing has a higher thermal stability than PVC waterproofing
6. EPDM has a higher UV resistance than PVC waterproofing 

Composition Difference Between EPDM and PVC Waterproofing

EPDM waterproofing membranes are made from synthetic rubber membrane, while PVC (Polyvinyl Chloride) waterproofing is made from thermoplastic membrane.

EPDM (Ethylene Propylene Diene Monomer) waterproofing is a synthetic rubber membrane that is made from ethylene and propylene. EPDM waterproofing membranes have an excellent elasticity and UV resistance. It is highly flexible and can stretch without cracking, making it ideal for various roofing and waterproofing applications.

PVC (Polyvinyl Chloride) waterproofing is a thermoplastic membrane made from polyvinyl chloride resin and plasticizers. These materials provide super durability and chemical resistance the PVC membranes. It remains rigid compared to EPDM but is heat-weldable, ensuring strong seams for watertight protection.

Read more: 10 Types of Waterproofing Membranes: Properties, Applications, Pros, and Cons

Water Resistance Difference Between EPDM and PVC Waterproofing

EPDM and PVC waterproofing both have excellent water resistance

EPDM waterproofing provides outstanding water resistance due to its seamless application and high elasticity. EPDM waterproofing prevents cracks that could lead to water infiltration to the substrate. It resists ponding water, making it a popular choice for low-slope roofs.

PVC waterproofing offers super resistance to standing water, oils, and chemicals. Due to PVC membrane heat welded joints, it eliminates the risk of leaking at the seams and can withstand in even harsh environmental conditions. 

Breathability Differences Between EPDM and PVC Waterproofing

EPDM waterproofing is more breathable than PVC waterproofing

EPDM is more breathable due to its microporous nature. EPDM allows to escape trapped moisture or vapor. Breathability properties of the EPDM reduce the risk of condensation buildup, preventing mold and structural damage over time.

While PVC is less breathable because it forms an impermeable layer, trapping moisture if not properly installed with ventilation systems. However, this non-permeability enhances its ability to prevent water ingress, making it more reliable in fully submerged conditions like tunnels and basements.

Flexibility Difference Between EPDM and PVC Waterproofing

EPDM waterproofing is more flexible than PVC waterproofing

EPDM waterproofing membrane is highly flexible due to its rubber composition, allowing it to stretch up to 300% without tearing. This elasticity makes it ideal for structures that experience movement, expansion, or contraction. EPDM waterproofing performs well in extreme weather conditions, adapting to substrate shifts without cracking it.

While PVC is more rigid because of its thermoplastic nature, but remains flexible with added plasticizers. However, it becomes brittle over time, especially in cold temperatures, reducing its adaptability compared to EPDM.

Chemical Resistance Difference Between EPDM and PVC Waterproofing

EPDM waterproofing has a lower chemical resistance than PVC waterproofing

EPDM is resistant to acids, alkalis, and ozone. Therefore EPDM can be used for outdoor usages such as roofs, and slabs. But when it is prone to petrolium based solvents it can be degraded over time. 

PVC has superior chemical resistance, particularly against oils, greases, and industrial chemicals. Its formulation makes it suitable for environments exposed to harsh substances, such as chemical plants and commercial roofing systems.

Temperature Stability Difference Between EPDM and PVC Waterproofing

EPDM waterproofing has a higher thermal stability than PVC waterproofing

EPDM membranes maintain superior stability in extreme temperatures, typically ranging from -45°C (-49°F) to 145°C (293°F), thanks to their robust synthetic rubber composition. Hence EPDM waterproofing membrane can expand and contract without losing integrity, making it suitable for varying climates.

PVC membranes have a narrower temperature stability range, roughly -20°C (-4°F) to 70°C (158°F). But it can be brittle or soften due to temperature differences. 

UV Resistance Difference Between EPDM and PVC Waterproofing

EPDM has a higher UV resistance than PVC waterproofing 

EPDM has excellent UV resistance due to its rubber-based composition and carbon black content, which helps absorb and dissipate UV radiation. This makes it highly durable in prolonged sun exposure, preventing cracking, fading, or degradation over time. EPDM membranes can last over 50 years with minimal UV-related damage.

While PVC also offers good UV resistance, but relies on added stabilizers and reflective coatings to maintain durability. Over time, UV exposure can degrade plasticizers, causing brittleness and reduced flexibility, especially in intense sunlight.

Read our similar expert guide related to EPDM and PVC waterproofing

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Functional and Environmental Impact Comparisons Between EPDM and PVC Waterproofing

These are the mechanical strength, safety, environmental impact and usability comparisons between EPDM and PVC waterproofing