Industrial Flat Roofs
Exposed mechanically-fastened systems for factories, warehouses, and commercial buildings.
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PVC Waterproofing Membrane
Professional-grade PVC (Polyvinyl Chloride) waterproofing membranes for roofing, tunnels, and below-grade applications. Available with polyester reinforcement, UV-stabilized formulations, and hot-air weldable seams. Confirm the applicable grade and test documentation for your project.
Hot-Air WeldablePolyester ReinforcedRoot Penetration ResistantChemical & Oil Resistance
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Product Overview
Why Choose PVC for Critical Engineering?
PVC waterproofing membranes are the smart choice for modern infrastructure. Unlike traditional bitumen products, PVC remains flexible for decades and uses thermoplastic welding to create an inseparable bond. At Tianyuan Waterproof, we ensure our PVC meets global engineering standards for durability and environmental resistance.
1. Internal Reinforced Structure (The Secret of Strength)
The reliability of a PVC membrane starts from within. Our Type P (Reinforced) series is engineered with a high-tenacity polyester fabric core.
- Internal Polyester Scrim: Acts as the “skeleton” of the membrane, preventing stretching and providing exceptional tear resistance.
- UV-Resistant Top Layer: Specifically formulated to reflect solar heat (Cool Roof effect) and resist degradation from long-term UV exposure.
- Durable Bottom Layer: Optimizes adhesion to various substrates while maintaining overall sheet flexibility.
2. High-Precision Installation: Monolithic Seams
The weakest point of any waterproofing system is usually the joint. PVC solves this through Hot-Air Welding. By melting the top and bottom layers of adjacent sheets together at 450°C+, they fuse into one single, continuous piece.
- No Adhesives Needed: Unlike EPDM or bitumen, the joint itself becomes the strongest part of the system.
- Automatic Welding: Our membranes are designed for high-speed automatic welding machines (like Leister), ensuring consistent quality across large-scale projects.
- Continuous Welded Seams: Once cooled, a properly executed seam forms a continuous connection. Weld settings, substrate preparation, and seam testing must follow the project installation requirements.
3. Integrated System Solutions: Accessories & Parts
A professional project requires more than just a roll of membrane. Tianyuan offers a complete accessory matrix to handle complex architectural details. Using prefabricated parts reduces labor costs and eliminates human error at corners and drains.
- Prefabricated Corners: Pre-molded inside and outside corners for 90-degree transitions.
- Mechanical Fasteners: Specialized screws and stress plates for wind-resistant steel roof systems.
- Roof Drains & Vents: PVC-compatible outlets designed to weld to the main membrane. Detail design and seam testing should follow the project waterproofing system requirements.
These accessories are also fully compatible with our TPO roofing membrane systems, allowing contractors to standardize detailing across mixed thermoplastic roof projects.
4. Proven Performance: Global Project Showcases
From 50,000 sqm industrial plants to complex metro tunnel linings, our PVC membranes have been proven in the field.
- Industrial Cool Roofs: White PVC reflects up to 80% of sunlight (Solar Reflectance Index > 85), reducing summer air conditioning costs by up to 20%.
- Tunnel & Subway: Our H-type (homogeneous) membranes provide reliable anti-seepage for high-pressure underground environments. See our technical documentation for project-specific waterproofing system design.
- Green Roofs: Inherent root resistance makes PVC the primary choice for sustainable rooftop gardens.
5. Technical Comparison: Choosing Between H, P, L, and G Types
| Type | Name | Structure | Typical Application |
|---|---|---|---|
| Type H | Homogeneous | Pure PVC sheet | Tunnels, underground, and detail applications |
| Type P | Reinforced | Internal Polyester Scrim | Exposed roofing (Mechanically Fastened) |
| Type L | Fleece-backed | Fabric/Fleece Backing | Fully Adhered systems and renovations |
| Type G | Glass Fiber | Internal Glass Fiber | Systems requiring enhanced dimensional stability |
Applications
Tunnel & Metro
PVC-P geomembrane blind-side lining for bored and cut-and-cover tunnels.
Green Roof & Plaza Decks
Root-resistant membrane beneath vegetated layers and pedestrian pavers.
Basement & Foundation
Below-grade tanking for deep excavations and retaining walls.
Swimming Pools & Water Features
Welded PVC lining for concrete pools, fountains, and reflecting ponds.
Key Benefits
Cool Roof Reflective Surface
The high Solar Reflectance Index (SRI) of our white PVC surface reflects up to 85% of solar radiation, significantly reducing building cooling costs and mitigating the urban heat island effect.
Root-Proof for Green Systems
Naturally resistant to root penetration without the need for additional biocides, making it the premier choice for vegetated roof gardens and landscaped podium decks in modern urban architecture.
Adaptive Low-Temp Workability
Maintains its flexibility and detailing capability in temperatures down to -25°C, ensuring that installation can proceed safely and reliably during winter months without the risk of membrane cracking.
Total Accessory Ecosystem
Supported by a full range of prefabricated corners, pipe boots, and drain flashings. These factory-molded components eliminate the variables of field fabrication and ensure uniform security across the entire project.
Technical Specifications
| Test Item | Unit | Test Method | Requirement | Result / Notes |
|---|---|---|---|---|
| Tensile Strength | MPa | GB12952 | >= 10 | 12-14 MPa |
| Elongation at Break | % | GB12952 | >= 200 (Type H) | 250%+ |
| Low Temp Flexibility | °C | GB12952 | No crack at -25 | Typical value; confirm with the product TDS |
| Puncture Resistance | N | FTM 101C | High Load | Typical value; confirm with the product TDS |
| Tear Resistance | N/mm | GB12952 | >= 50 | 55-65 |
| Dimensional Stability | % | GB12952 | ≤ 2.0 (80°C) | ≤ 1.5 |
| Watertightness | MPa | GB12952 | 0.3 MPa, 2h | No Leakage |
| Heat Aging (Tensile Retention) | % | GB12952 | ≥ 90 (80°C, 168h) | ≥ 92 |
| Joint Peel Strength | N/50mm | GB12952 | >= 40 | 45-55 |
| Solar Reflectance (White) | % | ASTM E1980 | >= 80 | 85-87 |
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Technical Downloads
PVC Technical Data Sheet (TDS)
Ready for PDF Request
Roofing System Manual
Ready for PDF Request
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Frequently Asked Questions
What is PVC waterproofing membrane and how is it different from TPO?
PVC (polyvinyl chloride) waterproofing membrane is a single-ply thermoplastic sheet that can be supplied with internal polyester reinforcement. Compared with TPO, PVC formulations and project suitability differ in flexibility, chemical resistance, welding behavior, environmental profile, and fire performance. Compare the product-specific TDS with the project requirements before selection.
Is PVC membrane good for flat roofs, and how thick should it be?
Yes, PVC membrane is widely used on flat and low-slope commercial roofs. For exposed mechanically-fastened systems, 1.5 mm (60 mil) is the standard thickness; for high-traffic or fully adhered applications, 1.8-2.0 mm (72-80 mil) is recommended. The membrane's hot-air welded seams create a monolithic barrier that performs reliably even under ponding water conditions.
How do you install and weld PVC waterproofing membrane?
PVC membrane is installed by mechanically fastening or fully adhering the sheets to the substrate, then hot-air welding the overlapping seams at approximately 450-550°C using an automatic welding machine (such as Leister). The heat fuses the top and bottom sheets into a single, inseparable joint that is stronger than the membrane itself. Proper welding requires clean, dry surfaces and ambient temperatures above -5°C.
Can PVC membrane be installed over existing bitumen roofing?
Yes, PVC membrane can be installed as a retrofit over existing bitumen roofing, but a separation layer (geotextile fleece or gypsum board) must be placed between the bitumen and the PVC. This prevents plasticizer migration from the PVC into the bitumen, which can cause embrittlement, and protects the new membrane from bitumen-related chemical attack.
How long does PVC roofing membrane last, and is it UV resistant?
PVC service life depends on the formulation, thickness, exposure, system design, installation quality, and maintenance. UV performance and solar reflectance also vary by formulation and surface color. Request the product-specific TDS and confirm the expected operating conditions before specification.
How do you repair a leaking PVC membrane seam?
PVC membrane seams can be repaired by cleaning the affected area, applying a PVC-compatible solvent cleaner, and hot-air welding a patch of the same material over the damaged seam. The patch must be round-cut at the corners to prevent peeling and should extend at least 75 mm beyond the damaged area in all directions. For extensive seam leakage, a new strip of membrane should be welded over the entire seam line rather than patching individual points.
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