Waterstop Tape | A Permanent Waterproofing Solution for Concrete Joints

24/07/2026

Waterstop Tape | A Permanent Waterproofing Solution for Concrete Joints

Waterstop Tape | A Permanent Waterproofing Solution for Concrete Joints

Waterstop Tape

Waterstop tape is a high-performance waterproofing product designed to prevent water penetration through concrete construction joints. Thanks to its elastic structure, it provides resistance against both positive (external-to-internal) and negative (internal-to-external) water pressure, ensuring long-lasting watertight performance.

What is Waterstop Tape?

Waterstop tape is used in reinforced concrete structures, especially at connection points such as cold joints, expansion joints and construction joints. It is placed in the middle of the joint during concrete pouring and adapts to the movement of concrete structures, preventing water infiltration.

Application Areas

Waterstop tape is widely used in:

  • Foundation and curtain wall concrete joints
  • Elevator pits
  • Underground parking structures
  • Tunnel and metro projects
  • Water tanks and treatment facilities
  • Swimming pools
  • Retaining walls
  • Basement floors and reinforced concrete walls

Its use is critical in all concrete joints where there is a risk of water exposure.

Types of Waterstop Tape

Internal Waterstop Tape

Installed between two concrete pours during construction. It is ideal for structures where the joint may be exposed to water pressure from both sides.

External Waterstop Tape

Applied to the outer surface of the joint and provides protection against external water pressure.

Swelling Waterstop Tape (Bentonite or Polymer Based)

Expands when it comes into contact with water, increasing its volume by approximately 2–3 times and sealing the joint. It provides a practical solution for narrow or difficult-to-access joints.

Advantages of Waterstop Tape

High Waterproofing Performance

Prevents water penetration through concrete cracks and construction joints.

Flexible and Elastic Structure

Adapts to concrete movements and prevents tearing, cracking or deformation.

Easy Installation

Provides fast and practical installation in construction environments.

Extends Structural Service Life

Helps prevent problems caused by freezing, corrosion and moisture.

Various Material Options

Available in different material alternatives such as:

  • PVC
  • TPE
  • EPDM
  • Bentonite-based solutions

Technical Specifications

PropertyDescription
MaterialPVC, TPE, EPDM or bentonite
Width150 – 300 mm
Thickness4 – 12 mm
Elongation CapacityUp to 300%
Expansion Capacity200% – 300% (for swelling tapes)
Application AreaInternal and external joints
DurabilityThroughout the concrete service life (with correct installation)

Waterstop Tape Installation Steps

  1. The formwork is prepared.
  2. The waterstop tape is positioned correctly in the center of the joint.
  3. Connection points are joined using special welding or adhesive methods.
  4. The first concrete pour is completed.
  5. Before the second pour, the tape is inspected and the concrete work is completed.
  6. Swelling waterstop tapes are applied to the surface with a special adhesive and concrete is poured after curing.

Frequently Asked Questions (FAQ)

What is waterstop tape used for?

Waterstop tape prevents water from entering structures through concrete joints and provides long-lasting passive waterproofing protection.

Should swelling waterstop tape or traditional waterstop tape be preferred?

The choice depends on the application details. Swelling tapes are practical for repair works, while traditional waterstop tapes are more effective for new construction projects.

Can waterstop tape be applied after concrete pouring?

Traditional waterstop tapes cannot usually be applied after concrete pouring. However, swelling waterstop tapes may be used afterward in certain special applications.

How long does waterstop tape last?

With a quality product and proper installation, waterstop tape can remain effective throughout the service life of the concrete structure.

Waterstop tape provides a reliable, durable and effective waterproofing solution for concrete structures in both new construction projects and repair applications.