PVC vs TPU Waterproofing: What You Should Know?

Written By Adam Paul - Waterproofing Expert

PVC waterproofing and TPU 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 PVC vs TPU 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 Comparison Between PVC and TPU Waterproofing

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

1. PVC (Polyvinyl Chloride) waterproofing is a synthetic membrane made from plasticized PVC compounds while TPU waterproofing membranes are thermoplastic polyurethane-based material.
2. PVC and TPU waterproofing are both highly water resistant
3. PVC is less breathable than TPU waterproofing
4. PVC waterproofing is less flexible than TPU waterproofing
5. PVC waterproofing and TPU waterproofing are both highly chemical resistant
6. PVC waterproofing has a narrow thermal stability, while TPU waterproofing has a wide range of thermal stability
7. PVC waterproofing has a lower UV resistance than TPU waterproofing

Composition Difference Between PVC and TPU Waterproofing

PVC (Polyvinyl Chloride) waterproofing is a synthetic membrane made from plasticized PVC compounds while TPU waterproofing membranes are thermoplastic polyurethane-based material.

PVC (Polyvinyl Chloride) waterproofing is a thermoplastic membrane made from polyvinyl chloride resin and plasticizers. These materials provide super durability and chemical resistance to the PVC membranes. Hence PVC waterproofing can be applied on roofs, slabs, decks and balconies. 

TPU waterproofing membranes are thermoplastic polyurethane-based material. TPU waterproofing membranes consist of hard and soft segments chemically bonded together. It helps to increase tensile strength, better abrasion resistance, and enhanced toughness. Due to their thermoplastic nature, TPU waterproofing membranes can be welded

Water Resistance Difference Between PVC and TPU Waterproofing

PVC and TPU waterproofing are both highly water resistant

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. 

TPU waterproofing offers superior water resistance due to its hydrophobic nature and high elasticity. It maintains its integrity under hydrostatic pressure, making it ideal for waterproofing areas prone to water immersion, such as reservoirs, tanks, and foundations.

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

Breathability Differences Between PVC and TPU Waterproofing

PVC is less breathable than TPU waterproofing

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.

While TPU waterproofing offers better breathability due to its semi-permeable structure, allowing controlled vapor transmission. This helps prevent moisture buildup, reducing the risk of blistering and material degradation in humid conditions.

Flexibility Difference Between PVC and TPU Waterproofing

PVC waterproofing is less flexible than TPU waterproofing

PVC is more rigid because of its thermoplastic nature, but remains flexible with added plasticizers. However,  it becomes less flexible in colder temperatures, increasing the risk of cracking or seam failure compared to TPU waterproofing.

While TPU waterproofing provides superior flexibility due to its elastomeric nature. It stretches and recovers easily. TPU waterproofing adapts to surface movements without cracking it. This makes TPU ideal for applications requiring high elongation and durability, such as dynamic structures and high-traffic areas.

Chemical Resistance Difference Between PVC and TPU Waterproofing

PVC waterproofing and TPU waterproofing are both highly chemical resistant.

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.

TPU waterproofing exhibits excellent chemical resistance, especially against oils, fuels, and harsh industrial chemicals. Its non-porous molecular structure makes it highly durable in chemically aggressive environments, making it a preferred choice for industrial and wastewater applications.

Temperature Stability Difference Between PVC and TPU Waterproofing

PVC waterproofing has a narrow thermal stability while TPU waterproofing has a wide range of thermal stability.

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. 

While TPU waterproofing has outstanding temperature stability, maintaining flexibility in both hot and cold conditions. It resists thermal expansion and contraction, making it suitable for extreme climates and applications exposed to significant temperature variations.

UV Resistance Difference Between PVC and TPU Waterproofing

PVC waterproofing has a lower UV resistance than TPU waterproofing

PVC waterproofing 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.

TPU waterproofing offers superior UV resistance because of its advanced polymer structure. It resists photodegradation more effectively than PVC, maintaining flexibility and durability even under intense sunlight. This makes TPU a better choice for long-term outdoor applications with high UV exposure.

Read our similar expert guide related to PVC and TPU waterproofing

• EPDM vs PVC waterproofing
• EPDM vs TPU waterproofing

Functional and Environmental Impact Comparisons Between PVC and TPU Waterproofing

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