Florida Marine Seawalls
Seawalls, quite possibly are the single most expensive property repair that any water front home owner may encounter. Seawalls
cost more than swimming pools and roofs. The investment you make to perform routine or required maintenance may save you the
thousands of dollars in the long run. Most seawalls in Florida are built of concrete panels or limestone rock grouted together
typically called “coral rock walls”.
Erosion, tidal action by nature, or boat wakes poses a serious threat to any seawall
and separates the strong and healthy seawall from the weak ones. Summer storms in South Florida are notorious for dumping 3-6
inches of rain in just a few hours. This extreme load of water running off your roof, from your pool, or just a sloping back
yard will test your wall to its limits.
Some of the things to know about your seawall are:
● Does it leak?
● Are there depressions appearing in the yard adjacent to the wall?
● Is the soil disappearing?
● Are there cracks in the cap of the wall face itself?
● Is your wall dipping, sagging, or even worse, bowing outwards?
Any of these conditions could mean you have serious seawall issues that
should be addressed. Sealing and patching is a common maintenance practice. All walls have sections between panels,
loose rocks, cracks, holes, or loose joints. All of these minor issues can be corrected by installing high strength marine grout
to the affected areas. The grout will prevent sea water from flowing through the wall and eroding away fine sand and soil
from the yard and under the wall. Second most common repair is footers. Often times the depth or penetration of the seawall no
longer extends below the “berm” or base of the canal bed. This is called undermining caused by tidal erosion or upland pressure
pushing sand fill out under the bottom of the panel.
A typical repair is to drive aluminum or vinyl sheet piling in front of the existing wall to form a row. When the driven row is
in place pumped concrete will be installed to fill in the area created between the wall and new footer sheets. The driven
sheets extend the depth of the wall.
Another more costly repair is called batter pilings. Often times an old wall will
show signs of leaning outward by as much as a foot or more. Causes usually are due to upland pressure brought on by pool
construction or heavy loads like garden walls or big trees.
A batter piling is a 12” x 12” concrete piling driven in front of the wall at a 30 degree angle spaced every 10 feet. With the new
batter pilings installed a new concrete cap can be formed and poured over them to connect the old wall to the new supporting
The photo on the top of this page shows our barge and crane at work. Morrison Contractors is equipped to
handle any and all needs that may arise.
For any type of Florida seawall inspection, repair, replacement, or questions please contact us for a no cost estimate.