The most common early warning sign
A soft spot or hole in the lawn a few feet behind the cap is the most common early warning sign of seawall trouble. It means soil is escaping into the canal, usually through a seam, crack, or failed weep hole filter.
Why it matters
Every tide cycle can carry more soil out. Over time, voids grow under the cap, tie rods lose support, and the wall becomes more likely to lean. Sinkholes near a pool deck or lanai can damage those structures too.
What not to do
Simply filling the hole with dirt treats the symptom. The soil will wash out again unless the leak point is sealed.
How it's fixed
- Find the leak point from the canal side (often visible at low tide as a gap or soil plume)
- Seal the seam or crack and restore filter fabric or weep hole filters
- Fill the void behind the wall with grout, flowable fill, or foam
- Re-check after a few weeks of tides
Related Seawall Repair Topics
Frequently Asked Questions
Is a sinkhole behind my seawall an emergency?
Not usually an emergency, but it should be addressed soon. Rapidly growing holes or ones near structures deserve prompt attention.
Can I fill it myself temporarily?
Filling for safety is fine, but schedule a repair to seal the leak point.
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