Bay Island Park

Seawalls must withstand some of the most brutal conditions of any marine structures built today. Cracking, bowing, or erosion of the ground behind the wall can be signs of trouble. Heavy loads due to high levels of ground water, violent storms, and marine borers are just a few of the hazards to consider when choosing which contractor and material to use to protect your waterfront property. Several of the most commonly used seawall materials that can protect your most valuable investment are available through Duncan Seawall and are described below:

Concrete Seawalls
Duncan Seawall is the area’s leader in installing the most durable concrete pre-cast seawalls. Our concrete sheet panels are manufactured off-site by a professional concrete fabricator with on-staff engineers to ensure that each panel is constructed using the highest level of quality concrete consistency. The panels are 8” thick, include 5,000 P.S.I. concrete and continuous steel rebar throughout, and are properly cured for approximately six weeks. These specifications provide the strength and stability needed in a superior concrete panel seawall.
After installing the concrete panels, Duncan Seawall supports the seawall with a steel reinforced, 5,000 P.S.I 20"x22" concrete cap and tieback system. Each tieback rod consists of a ¾” diameter hot dipped galvanized threaded rod with a 6” x 6” plate bolted to each end, securing the cap to an independent concrete base buried in the yard. Steel rods are not heated or bent in the field due to the reduction of structural integrity induced in the tieback rod.
This finished concrete cap is long lasting, aesthetically pleasing, and an added value to your waterfront property.
Corrugated Seawalls
In instances where a concrete seawall is not a viable option for the customer, Duncan Seawall offers a variety of corrugated panel alternatives that can be installed for both heavy and light duty applications.
Steel sheet panels are a long lasting, interlocking system that creates an extremely strong continuous wall (similar to concrete). Steel panels are primarily used when the exposed wall height is large or when other panels cannot be jetted or driven into the subsurface. In some areas, a rock or clay layer may exist below the sand table making steel panels the best solution. Steel sheet panel installation requires heavy equipment, which Duncan Seawall owns to make the installation the perfect solution when specified.
One of the most important design criteria to consider when choosing a sheet panel is the strength to weight ratio. This will dictate the strength of panel needed to support the load behind the wall. Aluminum is an excellent material for use when an alternative material, such as vinyl or composite, is not strong enough to be driven into the ground due to tree roots, rock, or clay strata being present under the sand table. Aluminum has the strength to be driven through most obstructions while remaining light enough to install without heavy equipment.
Whether you are installing a retaining wall on a lake or reinforcing your concrete seawall that has a swimming pool nearby, Duncan Seawall has the vinyl product that will work best for you. These panels can be installed using little or no heavy equipment, which is an excellent choice when there are tight conditions or limited access.
A composite seawall is manufactured using a pultrusion process, which creates fiber reinforced polymer profiles of extraordinary strength and resilience. These panels are designed and manufactured to provide an alternative solution to concrete, steel, aluminum, or vinyl and are available in a variety of colors, further enhancing the look of your waterfront. Composite seawalls often require little or no heavy equipment to install.

Wood Retaining Walls
Wood walls are commonly used on freshwater properties that do not require the strength or corrosive resistance that saltwater properties may require. Wood is also commonly used for retaining walls that are not constructed in water.

Due to the numerous materials available, Duncan Seawall will guide you through your options when making your seawall investment.

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