Sika Sika Greenstreak 667 PVC Retrofit System

The Sika Greenstreak 667 PVC Retrofit Waterstop System is purpose-built for the most demanding concrete joint sealing challenges — specifically where new concrete construction must interface with an existing structure. Forming a continuous, watertight barrier across critical joints, this heavy-duty retrofit waterstop is engineered to perform in high-pressure, high-moisture environments where long-term waterproofing integrity is non-negotiable.

At the core of the 667 system is a robust mechanical anchoring assembly featuring stainless steel batten bars and anchor bolts, ensuring precise, stable positioning against the existing concrete face prior to the new pour. Combined with a compatible structural epoxy gel — such as Sika 7300 — the system achieves a fully bonded, watertight seal that resists both water infiltration and joint movement over time. This combination of mechanical fastening and epoxy bonding makes the 667 one of the most secure retrofit waterstop solutions available for below-grade and water containment applications.

The 667 profile’s large 9-inch cross-section is specifically designed to handle significant hydrostatic head pressure, rated up to 150 feet — making it well-suited for deep foundations, large containment structures, water treatment facilities, tunnels, and other infrastructure where hydrostatic loads are a primary design concern. Whether the application involves vertical or horizontal joints, the Sika Greenstreak 667 PVC Retrofit Waterstop System provides the performance, durability, and installation confidence that critical waterproofing projects demand.

Key Features

The Sika Greenstreak 667 is specifically designed for retrofit joint applications, addressing one of the most common and challenging waterproofing scenarios in concrete construction — sealing the joint between newly poured concrete and an existing structure. Every component of this system is selected to ensure a secure, permanent, watertight connection at that critical interface.

The 667 system’s mechanical anchoring hardware sets it apart from surface-applied alternatives. Stainless steel batten bars and anchor bolts lock the waterstop firmly to the existing concrete face, eliminating movement or displacement during the new concrete pour. This is paired with a structural epoxy gel — Sika 7300 is the recommended product — which bonds the PVC profile directly to the substrate, creating a dual-mechanical-and-adhesive seal that stands up to sustained hydrostatic pressure and joint stress.

With a large 9-inch profile, the 667 is built to handle serious hydrostatic head pressure in ways that smaller retrofit profiles simply cannot. This makes it the right choice when project specs call for deep below-grade installations, large-volume containment structures, or any application where water pressure is a significant engineering concern.

The waterstop itself is manufactured from flexible, prime virgin PVC, formulated to resist chemical exposure, environmental degradation, and the long-term wear that comes with continuous water contact. All materials meet ASTM standards and Army Corps of Engineers specifications, giving engineers and specifiers confidence that the 667 will perform to documented, industry-recognized benchmarks for the life of the structure.

Technical Specifications

Frequently Asked Questions

What makes the Sika Greenstreak 667 suitable for retrofit waterstop applications? The 667 system is engineered specifically for retrofit scenarios where new concrete must be joined to an existing structure. Unlike embedded waterstops that are placed during the original pour, the 667 anchors directly to the face of the existing concrete using stainless steel batten bars, anchor bolts, and a structural epoxy gel. This combination of mechanical fastening and adhesive bonding creates a stable, watertight joint that accommodates the unique stresses and tolerances of retrofit construction — making it one of the most reliable solutions available for this type of application.

Can the 667 PVC Retrofit Waterstop handle high hydrostatic pressure? Yes. The 667 profile is specifically rated for high-pressure environments, capable of resisting up to 150 feet of hydrostatic head pressure. Its large 9-inch cross-section provides the physical mass and geometry needed to maintain a watertight seal under sustained water pressure loads. This makes it well-suited for deep below-grade structures, large water containment basins, tunnels, and other applications where hydrostatic pressure is a primary design consideration.

Is field welding acceptable, or are factory fabrications required? Heat welding is the only approved method for splicing PVC waterstop systems, including the 667. While field welding is possible with the proper equipment and training, factory-fabricated intersections and transitions are strongly recommended wherever joints change direction or intersect. Factory fabrications are produced under controlled conditions, resulting in more consistent, higher-quality welds that significantly reduce the risk of field installation errors and long-term waterstop failure. For critical applications, specifying factory fabrications is considered best practice.

What epoxy is recommended for installing the 667 Retrofit Waterstop System? Sika 7300 structural epoxy gel is the recommended adhesive for anchoring the 667 retrofit waterstop to existing concrete. Sika 7300 is a two-component epoxy system formulated for structural bonding applications, providing the high-strength, moisture-resistant bond needed to secure the PVC profile to the concrete substrate. An equivalent two-component structural epoxy gel may be substituted, but it should be verified as compatible with PVC waterstop systems and suitable for wet or below-grade environments prior to use.

Where is the Sika Greenstreak 667 Retrofit Waterstop typically used? The 667 is commonly specified for water and wastewater treatment plants, underground vaults, tunnels, below-grade foundation walls, large containment structures, and dam or reservoir rehabilitation projects. Any application that involves joining new concrete to existing concrete — particularly where high hydrostatic pressure or long-term water exposure is expected — is a strong candidate for the 667 system.

What length does the 667 Retrofit Waterstop come in? The Sika Greenstreak 667 PVC Retrofit Waterstop System is supplied in standard 10-foot pieces, making it easy to handle and stage on the job site. For longer joint runs, pieces are heat welded together in the field or factory-fabricated into continuous assemblies prior to installation.

Does the 667 system require any special maintenance after installation? Once properly installed and encapsulated in concrete, the 667 PVC Retrofit Waterstop System requires no ongoing maintenance. The flexible virgin PVC material is inherently resistant to chemical exposure, corrosion, and environmental degradation, ensuring long-term performance without intervention. The key to a maintenance-free service life is proper installation — correct anchoring, full epoxy bonding, and quality heat-welded splices are essential to achieving the system’s rated performance.