Cement is heavy and more likely to sink
Cement washes out over time
Cement is more prone to shrinking
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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.