You are currently viewing Why are there voids behind my seawall ?

Why are there voids behind my seawall ?

How Serious Are Voids?

Crashing waves and even the rise and fall of the daily tide cause erosion over time that washes away soil, and can expose the supportive structures of boardwalks, landscapes, and buildings. In addition to the slow wear-and-tear of the tides, a strong storm can erode large amounts of soil within the short space of a few hours! Statistics show that coastal erosion causes around 500 million dollars worth of damage each year in the United States; this includes the destruction/compromise of structures and loss of land. 

How Can Voids Be Stopped?

Five Dredge & Marine said that seawalls are one of the best known ways to stop voids from getting out of control and eating away your property. They are built at the most basic level with wood, block, steel, concrete, and even specialized plastics. Over the years, concrete has proven to be a more reliable choice due to the higher corrosion rate of the other materials. Plastic (PVC), though it doesn’t rust, is a fairly new option that hasn’t been through the test of time, and many engineers have doubts concerning the long-term integrity of the material.  


Traditional Five Dredge & Marine weep holes are an inexpensive drainage solution. Often, they are installed to relieve the hydro static water pressure from behind the wall. Traditional weep holes and other drainage systems clog, block drainage and eventually fail. This causes soil loss which leads to sinkholes. Ultimately, expensive excavation is the only way to fix traditional drainage systems when they fail.