Bulkhead Replacement

Replacement is the right call when the structural elements of the wall are beyond saving. Not when the wall looks bad — looking bad is frequently repairable — but when the things carrying the load have stopped carrying it.

The threshold

A bulkhead has four load-bearing components: the sheet piles, their embedment below the mudline, the tiebacks and anchors, and the cap that ties the piles together. Repair makes sense when enough of those are sound to build on. Replacement makes sense when they are not.

In practice we are looking at:

• Significant rotation. A wall that has leaned materially has normally also compromised its own embedment. Re-anchoring a wall that has moved that far is treating a symptom.
• Tieback system failure along the length. Isolated failed tiebacks get replaced. A system that has corroded through generally means the wall’s remaining life is short regardless of what you do at the top.
• Loss of embedment from toe scour. If the piles no longer have the depth the design depended on, the wall is working on borrowed time.
• Pile deterioration below the waterline. Common on older timber walls. Jacketing restores piles that still have a sound core; it does not restore piles that do not.
• Repair history. When a wall has been patched repeatedly and the problems keep returning in new places, the pattern is telling you the structure has reached the end rather than that the last repair was bad.

If none of those apply, you are probably reading the wrong page — bulkhead repair covers what can be fixed and for how much less.

Two ways to replace a wall

Build in front. The new wall is installed waterward of the existing structure, which stays where it is or is cut down. This avoids demolition entirely, and demolition on a tight residential waterfront lot is a significant part of the cost. The trade-offs are regulatory — moving a structure waterward changes how agencies look at it — and physical, in that you need the depth and the room to do it. Where it is viable it is usually the better project, so we evaluate it first.

Replace on the same alignment. The old wall comes out and the new one goes in on the existing line. More disruptive and more expensive, and sometimes the only option the site or the permit allows.

Which one applies to your property is something we work out during the estimate, not something you can determine from a photograph.

What a replacement project involves

The build is the same work described in new bulkhead construction — survey, soils, driving piles to design embedment, tiebacks to anchors set outside the active wedge, a structural cap, and backfill with a drainage detail that lets water out without taking soil with it. What makes replacement its own project is everything around that:

• Demolition and disposal, where the old wall is coming out.
• Protecting what stays. Mature landscaping, irrigation, lighting, pool decks and docks in the work corridor.
• Working around an existing dock. Frequently the dock ties into the wall, which means sequencing and sometimes temporary removal. If the dock is also tired, replacing both at once is normally cheaper than doing them two years apart — see dock repair.
• Re-establishing grade and drainage behind the new wall.

Permitting

Replacement generally requires permits, and a replacement on a new alignment is reviewed differently from a repair in place. Depending on the site this can involve FDEP, the U.S. Army Corps of Engineers, the St. Johns River Water Management District, and your county or city building department. These requirements change — confirm current requirements with each reviewing agency, and note that permit review is usually the longest item in the schedule. We handle permitting for the projects we build.

Getting a straight answer

We will tell you when your wall does not need replacing. That is not a sales position, it is the only way the recommendation is worth anything. A marine inspection gives you the condition of the elements that decide it, in writing.

Call (904) 327-3931 or request a free estimate.