Styrofoam can be used to build a floating dock that is both cost-effective as well as practical for those who need a platform in the water. The process can be surprisingly simple with the right materials. Here is a guide that will help you start.

1. Plan Your Dock Design

Decide on the size, shape and purpose of your dock before purchasing materials.

  • Size: Think about how many people will be using the dock or what kind of equipment they use.
  • Estimate how much weight the vehicle can support including people, gear and other items.
  • Location: Select a location with minimal waves and calm water to maximize stability and longevity.

Sketch your design on paper. You can use this to determine the amount of Styrofoam or lumber you need.

2. Gather Materials and Tools

You will require:

  • Styrofoam large blocks are the best option for durability.
  • For framing, use pressure-treated lumber or wood that is weather-resistant.
  • Galvanized screws (resistant to rusting in wet environments).
  • Plywood deck surface
  • Paint or sealant of marine grade (optional for additional protection)
  • Tools like a level, a tape measure, a drill and saber

3. Build the Frame

Build the frame to hold the Styrofoam.

  1. Cut the lumber to the desired dimensions.
  2. Use galvanized bolts or screws to assemble the pieces into rectangles.
  3. Add cross beams to the frame as additional support. This will help distribute the weight evenly on the dock.

Before proceeding, make sure that the frame is squared and level.

4. Place the Styrofoam blocks

Turn the frame upside-down so that you can place the Styrofoam beneath.

  • Arrange the blocks in a straight line along the bottom.
  • Keep a small gap between the pipes to allow for water flow and to prevent pressure from building up.

Styrofoam can be secured using heavy duty straps attached to the frame or treated wood slats. It is important to prevent the blocks from moving while the dock is being used.

5. Attach the Decking

Flip the frame upright once the Styrofoam has been secured.

  • Place plywood sheets or wooden planks over the frame.
  • Attach them using galvanized screws. Make sure the surface is flat and free of protruding fasteners.

You can later add rubber mats or textured paint to create a non-slip finish.

6. Seal and Protect

Styrofoam has a natural water resistance, but sealing the wood will increase the lifespan of the dock. Use a marine sealant to prevent rot, UV damage and moisture.

7. Launching and Securing the Dock

Move the dock carefully into the water. You should have several people to help you lift it and place it. Once the sandbag is in place, you can:

  • To prevent it from drifting, anchor it with ropes or chains.
  • The depth of the water and other conditions will determine how to adjust your anchoring technique.

8. Regular Maintenance

To keep your floating Styrofoam dock in good shape:

  • Regularly inspect it for damaged wood or loose fasteners.
  • If necessary, replace any Styrofoam that is cracked.
  • Sealant should be reapplied every two years or so for additional protection.

Final Thoughts

A floating Styrofoam Dock is an easy and effective way to create a stable platform in the water. You can build and design a dock to suit your needs at a reasonable cost by following these simple steps. Your dock will provide you with years of pleasure for swimming, fishing or simply relaxing on the water.

This post was written by a professional at Supreme Marine Floating Docks. Supreme Marine Floating Docks is dedicated to providing top-quality floating docks and marine accessories that combine durability, innovation, and superior performance. While we are a new brand, our team brings over 50 years of combined industry experience, making us trusted marina contractors Palm Beach. We are passionate about designing and delivering products that meet the highest standards, ensuring reliability and longevity in all marine environments. Whether for residential, commercial, or recreational use, our docks are crafted with precision and care, setting a new benchmark in the industry. At Supreme Marine, we don’t just build docks—we create lasting solutions.