What the cap does
The cap is the reinforced concrete beam along the top of the wall. It ties the panels or sheet piles together, carries the tieback connections and is the part you walk on and tie boats to. Because it lives in sun, salt spray and splash, it is often the first part of a wall to crack or spall.
Three options, and when each fits
| Option | Usually fits when | Watch out for |
|---|---|---|
| Patch or partial cap repair | Damage is limited to a few spots, the steel is still sound, and the panels and tiebacks below are in good shape. | Patches over rusting steel without treating it tend to fail quickly. |
| New cap | The cap's steel is badly corroded along much of its length, or you want more height and the wall below can carry it. | A new cap along most of your shoreline may count as a substantial repair and trigger the elevation standard. |
| New wall | Panels are failing in several places, tiebacks have failed, soil keeps escaping, or the wall is too low and too weak to raise. | Permitting can take longer than construction. Plan for it. |
Where the 50 percent rule comes in
In Fort Lauderdale, work along more than 50 percent of your shoreline, or work costing more than 50 percent of the wall's fair market replacement cost, is a substantial repair (ordinance text). Substantial repairs must meet the tidal flood barrier elevation of 5 feet NAVD88, or 4 feet NAVD88 for applications before January 1, 2035 when designed to reach 5 feet by 2050, along the entire shoreline. A full-length new cap can easily cross that line. That is not necessarily bad: pouring a taller cap is one of the most common ways to add elevation, as long as the panels, piles and tiebacks below can support it. Fort Lauderdale also requires a cap added to an existing seawall to be at least as wide as the existing cap (Ordinance C-23-05).
Other cities have their own twists. Lighthouse Point requires a cap elevation of at least 4.0 feet NAVD88, allows raising to 5.0 feet, and requires new or substantially rehabilitated walls to be designed to accommodate a 5.0 foot cap (Ordinance 2023-0998). Pompano Beach sets a minimum of 5 feet and a maximum of 5 feet 10 inches NAVD88 and limits how far a cap can extend toward the water (Sec. 151.05). See rules by city.
Typical published costs
One South Florida contractor publishes partial cap repair at $1,500 to $4,500 per job and full cap replacement at $3,000 to $10,000 per job, with new vinyl walls at $175 to $275 and concrete panel walls at $250 to $400 per linear foot installed (JKT Marine). Other Fort Lauderdale sources publish much higher per-foot figures for cap replacement and full replacement (Waterfront Repair FL). Scope drives the difference. More detail is in our cost guide.
Questions to ask before you choose
- What is causing the cap damage, and is the steel inside still sound?
- What condition are the panels, joints and tiebacks in below the cap?
- Would this scope count as a substantial repair? What would the finished elevation be in NAVD88?
- Can the wall carry a taller cap, or would raising it need new piles or anchors?
- How will the new cap meet my neighbors' walls?
We connect Fort Lauderdale and South Broward owners with licensed, insured local seawall contractors who can answer these on site and give you a written quote. See seawall cap repair or request a free quote.