Curtain Wall Injection Systems

Curtain wall injection systems are a specialized form of waterproofing technique used to create a waterproof barrier behind and around structures by injecting waterproofing materials into the soil or substrate adjacent to the structure. This method is particularly effective for stopping water ingress in situations where direct access to the leaking surface is difficult or impossible, such as behind retaining walls, basement walls, tunnels, and dams.

Why They Are Used

Waterproofing Hard-to-Reach Areas: Ideal for scenarios where direct surface treatment is impractical, such as behind walls or underneath foundations.

Sealing Extensive Leaks: Provides a comprehensive solution for extensive water ingress issues that cannot be addressed through surface treatments alone.

Preventing Groundwater Infiltration: Forms a continuous waterproof barrier that prevents groundwater from reaching the structure.

Structural Integrity: Helps to stabilize and strengthen the structure by filling voids and consolidating loose soils.

Types of Curtain Wall Injection Systems

Polyurethane (PU) Curtain Injection

Hydrophilic PU: Expands in the presence of water to form a flexible, watertight seal. It can penetrate fine cracks and soil pores, making it effective for waterproofing.

Hydrophobic PU: Repels water and forms a rigid barrier. It is suitable for areas where flexibility is not required.

Acrylic Gel Curtain Injection

Acrylic gels are low-viscosity materials that can penetrate very fine cracks and pores in the soil and substrate. They form a highly flexible and durable waterproof barrier.

Silicate-Based Injection

Silicate-based materials, such as sodium silicate, react with calcium hydroxide present in concrete or soil to form a gel. This type of injection is often used for damp-proofing and stabilizing loose soils.

Cementitious Grout Injection

Cement-based grouts are used to fill large voids and stabilize soil. While effective for structural reinforcement, they are less flexible compared to other materials and are typically used in less dynamic environments.

Application Process

Site Assessment: Evaluate the area to determine the extent of water ingress and the best injection material to use.

Drilling Injection Ports: Drill holes through the structure into the surrounding soil or substrate at regular intervals.

Installing Injection Packers: Place injection packers or ports into the drilled holes to control the flow of the injection material.

Injection: Inject the selected waterproofing material through the packers under pressure, allowing it to spread and create a barrier around the structure.

Curing: Allow the injected material to cure and form a solid, waterproof barrier.

Inspection and Finishing: Inspect the site to ensure the barrier is effective and perform any necessary surface finishing.

Advantages and Benefits

Non-Invasive: Can be applied without extensive excavation or disruption to the structure.

Comprehensive Coverage: Provides a thorough waterproof barrier around and behind structures.

Versatility: Suitable for various types of structures and soil conditions.

Long-Term Solution: Offers durable and long-lasting protection against water ingress.

Conclusion

Curtain wall injection systems are a powerful solution for addressing water ingress issues in challenging conditions where direct access is limited. By selecting the appropriate type of injection material, these systems can provide effective and long-lasting waterproofing, ensuring the structural integrity and longevity of the treated structures.