Back-attached Waterstop | Outer Adhered Waterstop
A water-facing concrete joint seal that installs two ways: hot-air welded with a matching EVA/PVC waterproof membrane to form a continuous barrier, or directly bonded & anchored onto the concrete substrate. Built for tunnels, underground and hydraulic structures.
7 Materials: EVA, PVC, NR, EPDM, CR, NBR, Steel-edge
400–550% Elongation
EN / ISO / ASTM / GB
Core Advantages
Dual Installation
Hot weld with matching waterproof sheet, or glue & mechanical anchor on concrete.
Full Material Range
EVA, PVC, NR, EPDM, CR, NBR and steel-edge reinforced types.
Deformation Adaptability
Elongation 400–550% absorbs settlement & expansion joint movement.
Global Compliance
EN, ISO, ASTM, GB test certificates. Custom manufacturing per drawing.
Material Selection Matrix
Selection Rule: If the project uses an EVA/PVC waterproof membrane, hot welding requires the same material (EVA with EVA, PVC with PVC), otherwise the weld fails. Rubber grades cannot be hot welded—use adhesive + anchoring instead.
| Material | Weld with EVA/PVC | Tensile | Elongation | Key Property |
|---|---|---|---|---|
| EVA | Yes | ≥16 MPa | ≥550% | Flexible, excellent weldability. Best for tunnels. |
| PVC | Yes | ≥10 MPa | ≥300% | Lowest cost. Best for buried joints. |
| NR Natural Rubber | No | 10–15 MPa | ≥400% | Balanced elasticity, cost-effective. |
| EPDM | No | ≥10 MPa | ≥300% | Excellent UV & weather resistance (-45°C). |
| CR Neoprene | No | ≥10 MPa | ≥350% | Flame retardant, acid & alkali resistant. |
Performance Reference
| Property | Plastic (EVA / PVC) | Rubber (NR / EPDM / CR) |
|---|---|---|
| Hardness (Shore A) | 60–75 | 60 ± 5 |
| Tensile Strength | ≥10–16 MPa | ≥10–15 MPa |
| Elongation at Break | ≥300–550% | ≥350–500% |
| Low Temp Brittleness | -25 to -35°C, no crack | -40 to -45°C, no crack |
Installation Key Points
EVA / PVC Welding
Double weld lines, effective width ≥ 15 mm each. Run a trial weld to set temperature & speed first.
Rubber Fixed Type
Level the concrete substrate with mortar; bond with special adhesive, or fix with galvanized clamping plate.
Alignment & Pouring
Align the waterstop centerline exactly with the joint. Prevent sharp aggregate or rebar from puncturing the strip.
Get a Free Custom Material Recommendation
Send your drawing & working condition for a no-obligation selection proposal, material sample strips, and the latest test reports.
📩 Email: pengfei_liu@feizhipan.com | 🌐 Website: feizhipan.com
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