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Cement is heavy and more likely to sink
Cement washes out over time
Cement is more prone to shrinking
As tidal flow rises and falls, water pushes its way in through cracks, joints, and defects in seawalls.
Semi-rigid hydrophobic polyurethane foam reacts with water or moisture in the soil and expands to fill voids while it permeates sandy soil to form a solid, strong, watertight mass.
Polyurethane foams are stronger than crystalline bedrock. Combined with proper drainage, this method can greatly extend the life of your seawall.