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Key Features of the Waterstop
Upon contact with water, the strip swells to 150%–600% of its original volume, generating sufficient sealing pressure to fill small voids and surface irregularities without over-stressing the surrounding concrete.
A water-activated waterstop joint filler bonds directly to the concrete substrate during swelling, creating an integrated seal that resists displacement under fluctuating water pressure.
The flexible, elastomeric body conforms to common surface imperfections such as honeycombing and minor misalignments at construction joints, helping achieve a reliable seal across varied site conditions.
The hydrophilic waterstop strip remains dimensionally stable when dry and activates only upon contact with water. Once the surrounding concrete cures and any future crack admits moisture, the strip responds-offering a long-term waterproofing defense with no ongoing maintenance.
Preformed profiles can be fixed using steel nails or compatible structural adhesives along the joint centerline. No field welding or special tooling is required, allowing straightforward placement during standard construction workflows.
Technical Parameters of the Waterstop
| Parameter | Typical Value |
| Product Form | Preformed strip |
| Base Material | Natural rubber / CR / EPDM compound |
Hardness (Shore A) | Commonly 42±10, 45±10, 48±10 |
| Expansion Ratio | Commonly 150%, 220%，250%, 400%, 600% |
| Tensile Strength | ≥3 MPa |
(Note: The above values are typical reference ranges. Actual specifications depend on the specific product model.)
Application Areas
Basement slabs and diaphragm walls
Cast-in-situ tunnel linings and inverts
Water treatment tanks and reservoirs
Pipe penetration seals and tie-rod hole waterproofing
Other water-retaining concrete structures
Installation Notes for the Waterstop
The concrete substrate surface should be clean, free of laitance, and free of loose debris prior to placement.
Fix the water-swellable waterstop strip at regular intervals along the joint centerline using nails or structural adhesive.
At splice points, overlap the strip ends sufficiently and bond with a suitable adhesive to maintain continuity of the seal.
Protect the installed strip from rainfall, standing water, or prolonged damp conditions until the secondary concrete pour is complete.
For vertical or overhead positions, additional adhesive fixing can help hold the strip securely during concrete placement.
FAQ
A water-swellable waterstop strip contains hydrophilic polymers dispersed within a rubber matrix. When the strip comes into contact with water, these polymers absorb moisture and cause the strip to expand volumetrically. This controlled expansion generates sealing pressure against the surrounding concrete surfaces, filling small voids, micro-cracks, and surface irregularities to block water ingress through the joint.
A hydrophilic waterstop strip is suitable for various concrete construction joints, including cold joints between successive pours, movement joints in basement slabs, wall-floor connection joints in water-retaining structures, pipe penetration seals, and tie-rod hole waterproofing. It adapts well to both horizontal and vertical joint configurations.
Yes. A high-performance hydrophilic waterstop strip is designed with sufficient flexibility and expansion capacity to conform to common surface irregularities such as honeycombing, minor misalignments, and surface roughness at construction joints. As the strip swells, it compresses into these irregularities, forming a continuous seal without requiring perfectly smooth substrates.
A water-swellable waterstop strip is commonly specified in underground construction such as basements and diaphragm walls, hydraulic structures including water treatment tanks and reservoirs, transportation infrastructure like cast-in-situ tunnels, and any concrete structure where construction joints require reliable long-term waterproofing against groundwater or retained water.
