The SPiRe®+ system consists of pultruded Glass Fiber Reinforced Polymer (GFRP) panels that are installed in front of an existing seawall and subsequently filled with grout to create a durable composite repair. The system offers several environmental advantages that make it particularly suitable for use in sensitive marine environments.

Material Stability and Durability

SPiRe®+ panels are manufactured from glass fibers encapsulated within a thermoset polymer matrix. Once cured, the material is chemically stable, inert, and highly resistant to corrosion in marine environments. Similar GFRP materials have been used worldwide for decades in marine structures, vessels, docks, and waterfront infrastructure because of their long service life and resistance to degradation in saltwater conditions.

Unlike steel systems, GFRP does not corrode and therefore does not release corrosion products into the surrounding environment. The material also does not require periodic protective coatings, reducing the need for future maintenance activities and associated environmental disturbance.

Minimal Encroachment into the Waterway

One of the principal environmental benefits of the SPiRe®+ system is its low profile. Typical installations project only approximately 75 mm from the face of the existing seawall, minimizing encroachment into the waterway and preserving the existing hydraulic conditions. This small footprint results in negligible loss of aquatic habitat and minimal impact on tidal flows or navigation.

Reduced Construction Impacts

The lightweight nature of the panels allows installation with relatively small equipment compared to conventional replacement or reconstruction methods. In many cases, the existing seawall remains in place and serves as the formwork for the repair, eliminating the need for extensive demolition, excavation, dredging, or removal of existing materials. This significantly reduces construction noise, vibration, turbidity, waste generation, and disruption to marine habitats.

Reduced Carbon Footprint

By extending the service life of the existing seawall rather than replacing it, the SPiRe®+ system conserves materials and avoids the environmental impacts associated with demolition, disposal, and reconstruction. The lightweight panels also reduce transportation and handling requirements, contributing to a lower overall carbon footprint.

Water Quality Protection

The cured GFRP panels are impermeable and non-corrosive, forming a protective barrier between the marine environment and the deteriorated structure behind them. The system can help prevent the release of concrete fragments, corroded steel products, and other deterioration by-products into the surrounding water. Once installed, the panels require no ongoing chemical treatments, preservatives, or protective coatings.

Long-Term Environmental Benefits

The anticipated service life of the SPiRe®+ system is measured in decades. Its resistance to corrosion, ultraviolet exposure, freeze-thaw cycling, and marine conditions minimizes future intervention requirements and associated environmental disturbance. By reducing maintenance frequency and extending the life of existing infrastructure, the system supports sustainable asset management practices in environmentally sensitive coastal areas.

Low-Impact Installation

Installation methods can be selected to avoid sensitive breeding, migration, or spawning periods, and the work can generally be performed with minimal underwater disturbance compared with conventional seawall replacement techniques.

Based on the above characteristics, the SPiRe®+ system is considered a low-impact repair solution for marine infrastructure and is particularly well suited for applications in environmentally sensitive coastal and estuarine environments.