Styrofoam floating docks are a great DIY for homeowners who want to be able to access the water easily without paying high construction costs. Styrofoam, a lightweight material that is buoyant and can be built easily with the right tools and materials, is an excellent DIY project.
This tutorial will show you how to build your floating Styrofoam Dock.
Step 1: Design Your Dock
Decide the size of your dock. The size of DIY docks can be changed to suit your needs. Larger docks need more flotation to stay stable and level in the water. Plan the dimensions of your dock as well as framing, float placement and other details.
Gather materials and tools
You’ll need the following to get started:
- Styrofoam blocks (marine-grade or dense construction foam)
- The frame is typically made from pressure-treated wood (2×6 or 2×8 boards).
- Bolts and brackets made of stainless steel or galvanized Steel
- Marine-grade plywood (optional for decking)
- Other tools include a drill, a saw, sanding tape and more.
- Paint or sealant exterior wood for weather protection.
Seal or encase the Styrofoam if it is not already coated. This will prevent damage and water absorption over time.
Step 3: Build the wooden frame
Build a rectangular framework with pressure-treated wood. You will need to cut and join four 2×6 boards into a square if you’re building an 8×8 dock. Use galvanized screws and corner brackets for stability. Insert cross beams into the frame to add strength and support foam blocks.
Measure diagonally from corner to corner after the frame is secured. Both measurements must match.
Step 4: Attach the Styrofoam Blocks
Place the Styrofoam Block inside the frame, between the cross beams. To achieve balance, make sure they are evenly spaced. You can use straps or brackets to fix each block, so it won’t float or move. Some builders use marine glue to add extra grip. Mechanical fasteners are better.
Make sure you have enough foam to support the weight of the dock and the people using it. Styrofoam can support 60 pounds per cubic feet. Foam is required for a dock to support 600 pounds.
Step 5: Install Decking
Once the flotation is in place, install the decking on top of the frame. The choice is between marine grade plywood or treated deck boards. Lay the boards parallel to the beams for added support. To allow water to drain, leave small gaps between boards.
To fasten decking, use galvanized screws. Ensure that all surfaces are even and flush. Sand any rough edges if necessary.
Step 6: Finishing and Waterproof
Protect wood from moisture, sun and mildew with a marine-grade exterior paint. It will extend the lifespan of your dock and make it look great for a long time. Pay attention to any holes or cuts that could allow water to enter.
Step 7: Launching the Anchor
The dock should be moved gently into the water. Once it has settled evenly, anchor it with ropes or chains. It won’t drift because of the wind or current.
Dock sections can be moved independently by using hinge brackets or flexible connectors.
Final Thoughts
A floating Styrofoam dock is a great project for any DIYer who enjoys the water. It’s also a cost-effective one. With basic carpentry skills and a weekend of work, you can create your own floating platform. To get the best results, use durable materials and double check all of your calculations.
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 a trusted name in the marine world. 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 aren’t just floating dock builders Ft Lauderdale—we create lasting solutions.
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