Sinkhole & Soil Loss
If you need erosion or void repair in Cape Coral behind a seawall, you almost certainly have soil washing through panel joints or a cap-panel gap. We stop the loss, fill the void, and seal the openings, in a single day with no excavation.
The repair scope is determined by where the soil is going and how much has already been lost.
Probe rods, visual inspection of cap-panel joints, and underwater diver survey of the panel waterline locate voids. We map the void volume in cubic feet so the polyurethane volume estimate is accurate.
Cap-panel separation is the most common entry point. We seal it with marine-grade polyurethane sealant or, for larger gaps, with concrete patching. Panel joints below the waterline are sealed with hydro-active polyurethane resin injected through small ports.
The bulk of the lost soil volume is replaced with closed-cell polyurethane foam injected through dime-sized ports in the cap. See polyurethane foam injection for full method detail.
Sinkholes at the surface (lawn, paver, pool deck) are filled flush. For larger surface failures, pavers may need re-set after foam fill.
Why Cape Coral Owners Choose Us
A polyurethane fill without sealing the joints is a temporary fix. We always include joint sealing because new soil will start leaving through the same openings within 1 to 2 tide cycles otherwise.
Joint sealing standard, not optionalWe measure void volume before injection. Density-monitored pumps then deliver the calculated foam volume. This prevents both under-filling (which leaves voids that reappear) and over-filling (which can lift slabs).
Pre-measured void volume, logged outputPolyurethane void fill comes with a 30-year transferable warranty against settlement or void return.
Transferable on sale of propertyTypical Cape Coral erosion and void repair runs 35 to 120 dollars per linear foot of wall treated, all-in.
Cape Coral sits on sandy dredge-fill soils, which means subsoil water moves more freely than in tighter inland soils. EPA records 8 inches of sea level rise in South Florida since 1950. The combination means panel-joint flushing is a steady, ongoing process on Cape Coral canals, not a once-in-a-while event. Polyurethane void fill is a high-leverage maintenance step that addresses this specific local condition.
"Managed a 480-foot condo seawall project for our HOA. Their team handled board reporting, phased the work to keep all slips occupied, and delivered final inspection records in a clean project binder. Reference projects we visited matched what we got."Rebecca N.SE Cape Coral · Commercial marine construction
"Routine inspection ahead of hurricane season. Diver went underwater, found two voids forming behind the wall that we did not know about. They quoted polyurethane injection at a fair price and the work was done in a day."Eric N.Tarpon Point · Pre-season inspection
"Wave action at the toe of our seawall was undermining the footing. They installed engineered riprap with proper bedding stone and geotextile. Three years in and the wall has not moved an inch. Solved a problem two other contractors missed."Helen K.Yacht Club · Riprap toe protection
Behind-seawall sinkholes in Cape Coral are almost always the result of soil washing out through gaps at panel joints or where the cap has separated from panels. Each tide cycle pumps water in and out, gradually carrying fine soil with it. Cape Coral's sandy dredge-fill soils substrate accelerates the problem because water moves freely once a void starts.
The standard repair is polyurethane foam injection through small ports drilled in the cap. The foam expands to fill voids, encapsulates loose soil, and bonds to the seawall panels and surrounding substrate. Joint sealing prevents new soil loss. The combination typically restores the area to near-original load capacity in one day.
Service Areas
We provide erosion and void repair across the 400-plus miles of canals in Cape Coral and the surrounding Lee County waterfront. Click any community below for local code notes, common failure modes, and what to expect from a free inspection.
One day on site. 30-year transferable warranty.
Schedule Free Inspectionor call (555) 000-0000