What We Offer
Product Introduction
Weidun®WD008 EVA sheet membranes are flexible thermoplastic sheets designed for tunnel and underground construction. They conform to uneven shotcrete surfaces and deliver long-term waterproofing performance under high groundwater pressure, making them an ideal solution for tunnels, metro systems, railway tunnels, and other underground structures.
Project-Based Insights
Hot year-round, 27–28°C. Wet season May–Nov with heavy rain (~2,000 mm). Dry season Dec–Apr. Abundant sunshine (~2,500 h). UV index very high, typically Aug to Sep.
Weidun has appointed the following regional distributors in Southeast Asia:
Matrix Chemical – Ho Chi Minh City, Vietnam
Tmassif Construction Chemical – Manila, Philippines
Weidun®WD008 is formulated to resist water-logging and biological degradation. It creates a permanent, non-degradable moisture seal that remains stable in humid air. This makes it the preferred standard choice for urban metro tunnels and large-scale hydraulic projects across the region.
Humidity Resistance
Service Life
Desert climate, scorching summers over 40°C, mild winters. Extremely arid (~60 mm rain). Year-round intense sunshine (~3,900 h). UV index very high, reaching 8–11.
Weidun has appointed the following regional distributors in the Middle East:
Procare Building Supplies – Dubai, UAE
Izomaks – Riyadh, Saudi Arabia
Our EVA membranes remain structurally sound even when subterranean temperatures fluctuate. In high-density urban developments and desert infrastructure, this specialized membrane provides a chemically stable barrier.
High Temperature Endurance
Water Pressure Ressistence
Mediterranean semi-arid climate, hot dry summers 26–27°C, mild wet winters (~317 mm rain). Abundant sunshine (~3,900 h). UV index high, 8–9 in summer.
Weidun has appointed the following regional distributors in North Africa:
Our membranes are favored across North Africa because of their ability to withstand constant expansion and contraction. Due to its chemical stability, the EVA compound remains flexible and effective over a long service life, whether it’s protecting a railway through the mountains or a culvert in a coastal city.
Protection Excellent
Waterproof Integrity
Quick Product Guide
Everything contractors, architects, and project owners need to know before selecting this waterproofing system.
Weidun®WD008 is not just a lining—it is a high-performance engineering asset. It is not like rigid HDPE membranes that struggle with the uneven surfaces of shotcrete. Our EVA membrane is characterized by its high flexibility and memory properties. This allows the sheet to conform to the contours of a tunnel’s primary lining.
Weidun®WD008 is used in advanced tunneling and civil engineering projects, such as NATM road tunnels, urban metros, and large-scale hydraulic infrastructure. It is specifically deployed in complex underground environments featuring irregular substrates, high hydrostatic pressure, and diverse regional climates across Southeast Asia, the Middle East, and North Africa.
Tunnel waterproofing involves a comprehensive installation system rather than a single product. It includes substrate preparation, geotextile installation, EVA membrane laying and hot-air welding, as well as the installation of drainage components before concrete lining. For complete installation procedures, technical drawings, and project-specific recommendations, please contact Weidun’s technical sales team.
Why Choose US?
This waterproofing sheet has been rigorously tested and approved by international transportation and construction authorities. Our products are available in over 35 countries and are the most trusted choice for infrastructure projects that cannot afford failure.
Compared to traditional HDPE or bitumen membranes, our EVA material can perform better even on irregular surfaces. Rigid materials require a perfectly smooth substrate to prevent bridging that often leads to punctures. Our EVA membrane has high elasticity, allowing it to relax into the surface profile. This waterproofing membrane ensures 100% contact and security.
Offers high recovery and elongation to maintain integrity across extreme temperature ranges.
The optimized design reduces the dead load on the structure and eases the manual handling required during overhead tunnel installation.
Backed by a 50-year warranty, providing peace of mind for high-stakes government and private infrastructure.
Delivers an adhesion strength of up to 0.8 MPa and retains a 68% immersion strength, ensuring a permanent bond to concrete even under constant water exposure.
Products Comparison
This ethylene-vinyl acetate sheet serves as a high-performance foundation for your subterranean waterproofing system. It possesses a flexible base that absorbs geological movement and provides a watertight seal. It ensures the structural envelope remains impervious to moisture ingress even under significant hydrostatic pressure.
If the project requires a high-density solution that integrates directly with the structural pour, then our HDPE membrane provides the ultimate bond. It is engineered for underground and basement projects where the membrane must be one with the concrete substrate.
Nowadays, HDPE is less popular in tunnel projects.
Technical Performance
Comparison: EVA vs HDPE
Feature | EVA (Weidun® WD008) | HDPE (Weidun® WD006) |
Primary Goal | Tunneling/Civil Engineering. | Basements/Foundation Walls. |
Bonding Logic | Loose-laid with welded seams. | Fully bonded/closed to concrete. |
Substrate Fit | Excellent for irregular shotcrete. | Best for smooth/prepared concrete. |
Flexibility | Excellent; soft and conformable. | Stiff; high structural mass. |
Structural Use | NATM / Drill-and-Blast Tunnels. | Shield Tunnels / Slab-on-grade. |
Weidun®WD008 provides a flexible, high-performance EVA waterproofing solution engineered specifically for complex tunneling and civil engineering environments. Its superior elasticity, cold resistance, and seamless weldability ensure permanent moisture protection on irregular substrates like shotcrete. Backed by a 50-year warranty, it delivers long-term, zero-maintenance reliability for high-stakes global infrastructure.
Expert-Insight
Before installing the waterproofing membrane, inspect the primary lining to ensure sufficient clearance and remove any rock overbreak. Completing this work before the formwork jumbo is installed helps avoid construction delays and reduces the risk of damaging the membrane.
The shotcrete surface should be smooth and even to provide a continuous substrate. Irregular areas should be trimmed and repaired with mortar where necessary. Exposed rock bolts, wire mesh, and rebar ends must be cut back or hammered flat to eliminate sharp edges that could puncture the membrane.
The geotextile should be installed circumferentially along the tunnel profile and securely fastened to the primary shotcrete lining using powder-actuated fasteners. It must be firmly fixed without sagging, loosening, or leaving any unsupported areas. Waterproofing membrane joints should be staggered at least 1 m.
The EVA waterproofing membrane should be installed using the concealed fastening method to prevent damage to the waterproofing layer. The membrane must be laid flat while maintaining adequate slack to accommodate tunnel deformation and prevent excessive tension during secondary concrete lining.
Adjacent membrane sheets should overlap by 150 mm (6 in.). Both insufficient and excessive overlap can compromise the quality of hot-air welded seams. Each installed membrane sheet should extend at least 1 m (3.3 ft.) beyond the secondary lining to provide sufficient overlap with the next section.
Testimonials
During our initial communication, I was concerned that too many customization requests might be difficult to fulfill. However, WEIDUN Company has satisfied almost all of them.
Minh Nguyen - Vietnam
As a subcontractor, every time after the construction inspection, the main contractor is extremely satisfied with our product quality. This has been our sixth year of cooperation with WEIDUN.
Admad Arif - Dubai
The temperature difference between day and night in our region is quite significant. However, the products of WEIDUN have withstood the test. Although the prices of these products are relatively high, they have indeed been flawless.
Saleh Abbas - Libya
During our initial communication, I was concerned that too many customization requests might be difficult to fulfill. However, WEIDUN Company has satisfied almost all of them.
Minh Nguyen - Vietnam
As a subcontractor, every time after the construction inspection, the main contractor is extremely satisfied with our product quality. This has been our sixth year of cooperation with WEIDUN.
Admad Arif - Dubai
The temperature difference between day and night in our region is quite significant. However, the products of WEIDUN have withstood the test. Although the prices of these products are relatively high, they have indeed been flawless.
Saleh Abbas - Libya
Production To Shipment
Choose the Right Products
Our product line is manufactured to match the specific technical demands of underground civil engineering and industrial roofing.
FAQ’s
Road tunnels often have irregular rock surfaces. HDPE is too stiff to follow these contours, creating tents or gaps that easily puncture. EVA is soft and flexible, hugging the surface to prevent damage.
EVA waterproofing membranes are primarily used in underground structures, including road tunnels, railway tunnels, metro systems, hydraulic tunnels, and underground caverns. They provide a continuous waterproofing barrier between the primary shotcrete lining and the secondary concrete lining, helping prevent groundwater infiltration and extending the service life of the structure.
EVA membranes are typically installed over a geotextile layer using a concealed fastening system. Adjacent sheets are overlapped and joined by hot-air welding to create continuous watertight seams. Before installation, the shotcrete surface should be smooth and free of sharp protrusions that could damage the membrane.
Get in Touch
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Choose your time-proven waterproofing materials and solutions, backed by our experienced technical team.
Weidun is committed to transparency and sustainability. Please fill out the form below, and our experts will get in touch with you.
Weidun is committed to transparency and sustainability. Please fill out the form below, and our experts will get in touch with you.
