EVA Waterstop Manufacturer and Supplier in Tianjin City – Specifications, Installation and Selection Guide

发布于 2026-10-13

Hengshui Zhanhe Engineering Rubber Co., Ltd. supplies eva waterstop and related engineering rubber products to contractors, distributors and infrastructure projects worldwide. An EVA waterstop that can be hot-air welded directly to an EVA waterproofing membrane, forming one continuous sealed system in tunnels.

This article explains the working principle, main types, typical applications, installation points, selection criteria, standards and frequently asked questions about eva waterstop, and is intended for engineers, purchasers and project managers.

1. What Is EVA Waterstop?

An EVA waterstop that can be hot-air welded directly to an EVA waterproofing membrane, forming one continuous sealed system in tunnels.

Working principle: The product works through elastic deformation and mechanical interlock to provide reliable sealing or load transfer.

2. Main Types

• Centrally embedded EVA waterstop: cast into the lining at construction and deformation joints, weldable to EVA membrane.
• Externally applied EVA waterstop: fixed on the water-facing side for additional waterproofing or detail reinforcement.
• Composite EVA waterstop: combined with a water-swelling layer for extra margin where water pressure is present.

3. Typical Applications

• Construction and deformation joints in railway and road tunnel secondary linings, welded to EVA membranes.
• Detail treatment and additional waterproofing in metro stations and running tunnels.
• Deformation joints in utility tunnels, underground car parks and basements.
• Underground works in cold regions, where EVA's lower brittle temperature compared with PVC helps winter working.

4. Installation and Construction Points

1. Lay and inspect the membrane first, checking the substrate is smooth and free of sharp protrusions.
2. Position the waterstop centrally on the joint and fix it with dedicated clamps at even spacing.
3. Weld to the EVA membrane with matching welding strip using hot air; the weld width should be not less than 20 mm.
4. Join the waterstop itself by butt or lap welding, with a lap length of not less than 100 mm.
5. Inspect welds visually; for critical areas use double welds with an air channel and inflate to check that pressure holds.
6. Keep vibrators away from the waterstop and membrane during concreting and cap reinforcement ends.

5. Selection Guide

• Confirm the design displacement, load grade and service environment before ordering.
• Select material grade according to temperature range, medium and durability requirements.
• Provide drawings or a specification list so that the manufacturer can verify sizes.

6. Standards and Quality Control

EVA Waterstop is manufactured and inspected according to applicable national and industry standards. Hengshui Zhanhe Engineering Rubber Co., Ltd. carries out batch inspection before delivery, and inspection certificates together with third-party test reports (where required by the project) can be provided.

Typical standards applied to this product family include Chinese national and transportation industry standards; equivalent international standards can be referenced upon request.

7. FAQ

Q: Can an EVA waterstop be welded to a PVC membrane?

A: Not recommended. The two materials have different melting behaviour and compatibility, so welds tend to be defective and hard to verify. Match the waterstop to the membrane material, and if a transition is unavoidable, qualify the procedure and obtain the designer's approval.

Q: How is weld quality checked?

A: Visual inspection first, looking for continuous weld tracks without scorching or missed sections. For critical areas a double weld with an intermediate air channel is inflated, typically to 0.1-0.15 MPa, and held for several minutes without noticeable pressure loss, following the approved method statement.

Q: Can the waterstop be inspected after it is buried?

A: No, it is concealed work. Weld quality and alignment must therefore be controlled during construction. Once the lining is complete, condition is judged only from leakage, and treating a leaking joint by injection or chasing out costs far more than the original inspection.

8. Price Factors

Quoted per metre, with a common 300 x 6 mm profile at around 25-45 RMB per metre. The price varies with VA content, thickness and whether a water-swelling layer is laminated. When supplied together with EVA membrane and welding strip, the package is usually priced as a complete waterproofing system.

Packing: standard export packing (woven bags, pallets or wooden cases). Delivery terms: EXW, FOB, CFR, CIF or DAP as agreed. Payment terms: T/T, L/C or other terms subject to negotiation.

9. Why Work With Hengshui Zhanhe Engineering Rubber Co., Ltd.

• Manufacturer based in Hengshui, Hebei — the engineering rubber industry cluster in North China, with in-house production and inspection.
• OEM and ODM supported: sizes, hardness, profiles and packaging can be customized to project or market requirements.
• Batch inspection before shipment; certificates of conformity and third-party test reports available when required.
• Technical support for selection, shop drawings and installation guidance, with export packing and worldwide logistics arrangement.

10. Contact and Quotation

For specification sheets, samples, pricing or project support, please contact Hengshui Zhanhe Engineering Rubber Co., Ltd.. Email: 150051331@qq.com · Tel/WhatsApp: +86-13833886677 · Factory: No.168, Zhangtuantuo Village, Dengzhuang Town, Taocheng District, Hengshui, Hebei, China. We reply to export enquiries within 24 hours on working days.