Sika Sika Greenstreak Hydrotite

Sika Hydrotite is a high-performance, adhesive-backed, co-extruded hydrophilic waterstop designed to deliver a permanent, watertight seal at concrete construction joints. Supplied in a convenient 32.8-foot roll, this compact 7mm x 25mm profile expands up to eight times its original volume upon water exposure — creating a powerful compression seal that stops water ingress in cast-in-place concrete joints. Manufactured from non-bentonite, modified chloroprene rubber, the co-extruded design provides controlled, directional expansion for precise, predictable joint sealing performance. A built-in expansion delay coating prevents premature swelling, allowing concrete to fully cure before the hydrophilic rubber activates. The factory-applied peel-and-stick adhesive backing makes installation fast and straightforward — simply remove the release paper and press firmly to a clean, prepared concrete surface. NSF/ANSI 61 certified for use in potable water structures, Sika Hydrotite is a trusted waterproofing solution for water and wastewater treatment plants, tunnels, foundations, retaining walls, and below-grade concrete construction.

Key Features

Hydrotite is engineered to outperform traditional waterstop solutions from the material up. Unlike bentonite-based alternatives, its modified chloroprene rubber construction delivers superior resilience and long-term durability in continuously wet or intermittently wet environments. Upon water contact, the hydrophilic rubber expands up to eight times its original volume, generating a powerful compression seal that effectively stops water migration through concrete construction joints.

The co-extruded profile is designed to direct expansion inward rather than outward, significantly reducing lateral stress on surrounding concrete and minimizing the risk of cracking. A built-in delayed swell coating ensures the profile remains stable during concrete placement, only activating once the concrete has fully cured — giving contractors confidence in both timing and performance.

Installation is straightforward on both new construction and retrofit applications. The peel-and-stick adhesive backing bonds directly to a clean concrete surface without the need for additional adhesives or special tools, making it one of the most installer-friendly hydrophilic waterstop solutions available. Once in place, Hydrotite is capable of withstanding hydrostatic head pressures up to 150 feet, and carries NSF/ANSI 61 certification, making it a code-compliant choice for potable water structures, wastewater treatment facilities, and other water-contact applications.

Technical Specifications

Frequently Asked Questions

Can Sika Hydrotite be installed before the second concrete pour? Yes. Hydrotite profiles are designed for installation after the first form is stripped and before the second concrete pour is made, meaning splitting of forms is not required. However, installation should be timed as close as possible to the second pour to reduce the risk of premature expansion from rainwater or groundwater exposure.

Does this product come with adhesive backing? Select profiles are available with a factory-applied peel-and-stick adhesive backing for faster, easier installation. Simply remove the release paper and press firmly to a clean, prepared concrete surface. Other profiles can be secured using Sika Hydrotite Adhesive or Sika Greenstreak Epoxy 7300 on rough or wet concrete surfaces.

Is Sika Hydrotite suitable for potable water structures? Yes. All profiles are NSF/ANSI 61 certified, making Sika Hydrotite a code-compliant choice for potable water treatment facilities, reservoirs, and other water-contact applications.

What happens if the profile gets wet before the concrete is poured? If the profile expands prematurely due to exposure to rainwater or groundwater, the swelled material should be removed and replaced with a new length before the concrete pour proceeds. Storing and protecting exposed lengths from moisture is strongly recommended until the pour is ready.

Can Sika Hydrotite be used in retrofit applications? Yes. Hydrotite is suitable for both new construction and retrofit applications, making it a versatile solution for sealing joints in existing structures that require waterproofing upgrades.

How are splices and corners handled? Straight splices should be cut square and joined with a cyanoacrylate adhesive such as super glue. For flat 90° corners, miter cut each end at 45° before bonding. All splices can be further reinforced with a bead of compatible swellable sealant for added security.

What is the maximum hydrostatic pressure Hydrotite can withstand? Most Sika Hydrotite profiles are rated to withstand hydrostatic head pressures up to 150 feet, making them well-suited for demanding below-grade and water-containment applications.

What is the minimum concrete coverage required? A minimum of 2 inches of concrete coverage over the profile is required to prevent cracking from expansion pressure. Greater coverage is recommended when using lightweight or low-strength concrete with a compressive strength below 3,000 PSI.