Sika Sika Greenstreak 655 PVC Retrofit System

The Sika Greenstreak 655 PVC Retrofit Waterstop System is a heavy-duty, flexible PVC waterstop solution engineered specifically for sealing construction joints between new concrete pours and existing concrete structures. Designed for demanding retrofit applications, this system is mechanically anchored to the existing concrete face using a stainless steel batten bar and anchor bolt assembly, combined with a high-strength structural epoxy gel to create a secure, long-lasting bond. Once properly installed, the 655 profile forms a continuous, watertight diaphragm across the construction joint, effectively preventing fluid migration, water infiltration, and hydrostatic pressure-driven leakage.

The 655 retrofit waterstop profile is an ideal solution for waterproofing and rehabilitating aging or compromised concrete joints in a wide range of critical infrastructure applications. Whether retrofitting water containment systems, underground vaults, below-grade foundations, or structural concrete walls, the 655 system delivers proven performance in environments where joint movement, groundwater intrusion, and long-term leakage prevention are primary concerns. Its flexible PVC construction allows the profile to accommodate minor joint movement while maintaining a reliable watertight seal — making it one of the most versatile PVC retrofit waterstop solutions available for both new construction tie-ins and existing structure rehabilitation projects.

Key Features

The Sika Greenstreak 655 PVC Retrofit Waterstop System is purpose-built for retrofit construction joints, specifically engineered to create a durable, watertight connection where new concrete meets an existing structure. The system ships complete with stainless steel anchor hardware and is installed using a compatible structural epoxy gel, ensuring a mechanically sound and chemically bonded attachment to the existing concrete face — eliminating the risk of slippage or joint failure over time.

Constructed from high-quality flexible PVC, the 655 profile is designed to adapt to real-world joint conditions, accommodating minor movement without compromising the integrity of the watertight seal. Once installed, it forms a continuous watertight diaphragm across the construction joint, creating a reliable barrier against fluid migration and hydrostatic pressure. The 655 system is suitable for both vertical and horizontal joint applications, making it a versatile choice across a broad range of project types and structural configurations.

From a compliance standpoint, the 655 retrofit waterstop meets the performance specifications set forth by the U.S. Army Corps of Engineers as well as ASTM standards — giving engineers, specifiers, and contractors confidence that the product will perform to the highest industry benchmarks in even the most demanding waterproofing environments.

Technical Specifications

Frequently Asked Questions

Where is the Sika Greenstreak 655 Retrofit Waterstop System typically used? The 655 retrofit waterstop system is commonly used in applications where new concrete is poured directly against an existing concrete structure. Typical installations include water and wastewater treatment tanks, underground vaults, tunnels, retaining walls, below-grade foundation walls, and industrial containment structures. Any project requiring a reliable, long-term watertight seal at a retrofit construction joint is a strong candidate for the 655 system.

Is the structural epoxy gel included with the 655 system? No, the required Sika 7300 structural epoxy gel is sold separately and must be purchased alongside the waterstop. The epoxy gel is a critical component of the installation — it provides the chemical bond between the stainless steel batten bar assembly and the existing concrete face, and should not be substituted with an incompatible product. Always confirm you have the correct epoxy on hand before beginning installation.

Can the 655 retrofit waterstop system handle joint movement? Yes. The 655 profile is manufactured from flexible PVC specifically chosen for its ability to accommodate minor joint movement without breaking the watertight seal. Combined with the secure mechanical anchoring provided by the stainless steel batten bar and anchor bolt system, the 655 is well-suited for joints where some degree of movement, settlement, or thermal expansion and contraction is anticipated.

What length does each piece of the 655 retrofit waterstop come in? Each piece of the Sika Greenstreak 655 PVC Retrofit Waterstop System is supplied in a standard 10-foot length, making it straightforward to plan material quantities for your project. For longer joint runs, multiple pieces can be field spliced using heat welding to maintain a continuous, uninterrupted watertight barrier.

What is the difference between a retrofit waterstop and a standard embedded waterstop? A standard embedded PVC waterstop is installed prior to the initial concrete pour and becomes fully encapsulated within the concrete on both sides of the joint. A retrofit waterstop, like the 655 system, is designed for situations where one side of the joint already exists as a hardened concrete structure. Rather than being embedded, the retrofit waterstop is mechanically anchored to the face of the existing concrete using stainless steel hardware and structural epoxy, then tied into the new concrete pour — making it the correct solution for repair, rehabilitation, and new addition projects.

Does the 655 system require factory fabrication for corners and intersections? While field welding is possible, factory-fabricated fittings are strongly recommended for corners, transitions, and intersections. Factory fabrications ensure a higher degree of precision and consistency compared to field welds, reducing the risk of waterstop system failure at the most vulnerable points of the joint layout. Consult with your Sika representative about available prefabricated fitting options for your specific project configuration.