Guide
Barnacles on seawalls and dock pilings: what they do and when to clean
Barnacles add weight and hide the surface of a wall or piling. Read what growth does and what a cleaning lets you see.
What growth does to a structure
- Weight and added drag on pilings; growth on the surface also speeds up corrosion of the metal and rebar inside.
- Growth makes a wall or piling hard to inspect; spalling, cracks or exposed rebar often stay hidden until it is cleaned off.
Timing
- Once a year is a common baseline for private seawalls and pilings; spots with heavier growth may need more.
- King tide season in South Florida generally runs September through November, in a few multi-day windows that shift a little each year.
What to ask for
- A surface review after cleaning, with photos of anything that needs a contractor.
Sources
- Frontiers in Marine Science (peer-reviewed): Managing biofouling on submerged static artificial structures — https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2021.759194/full
- Southern Boating & Yachting: Dock maintenance tips — https://southernboating.com/featured/effortless-dock-maintenance-expert-tips-for-a-well-maintained-waterfront/
- Miami-Dade County: King tides — https://www.miamidade.gov/initiative/weather-ready/flooding/king-tides.page
Related service
Seawall & Dock Piling Cleaning — Barnacles damage more than appearance. Over time, they compromise structural integrity through weight and corrosive secretions.