Floating Dock Railing and Gangway
Step-by-step guide made from Indy Farm Life's YouTube video.
This project demonstrates how to add a custom wooden railing to an existing floating dock and construct a floating gangway to connect it to the shore. The process involves installing notched 4x4 and 6x6 posts, attaching pre-fabricated railing panels, and building a separate floating gangway using 2x10 lumber and plastic barrels for buoyancy.
- Difficulty: intermediate
Safety
- Always exercise caution when working with power tools, especially near water.
- Ensure the dock and gangway are stable before walking on them.
Must know before you build
- Purchase pre-built railing panels; often cheaper than DIY assembly.
- Precisely notch 6x6 corner posts and deck boards for a flush, stable fit.
- Apply water sealer to all cut ends of treated posts for maximum longevity.
- Use a post level and ratchet straps to ensure railing posts are plumb before final securing.
- A portable generator is essential for powering tools at remote dock locations.
Tools
- Circular saw
- Oscillating multi-tool (optional)
- Sander (orbital sander) (optional)
- Generator (portable generator, WEN) (optional)
- Cordless drill (DeWalt)
- Jigsaw (Porter-Cable)
- Post level
- Ratchet straps (optional)
Materials
- Pre-built railing panels (Treated wood, 6 ft)
- 4x4 posts (4, Treated wood)
- 6x6 posts (4, Treated wood)
- 2x10 lumber (Treated wood)
- 2x6 lumber (Treated wood)
- Lag screws (3/8 inch)
- Washers (3/8 inch)
- Wood screws (#9, 3 inch)
- Water sealer (Thompson's WaterSeal)
- Plastic barrels (2+, 55 gallon)
- Railing brackets (Steel)
- Gate hinges
- Dock ladder (1, Aluminum, flip-up)
Step by step
Step 1: Prepare the Posts
Notch the 4x4 and 6x6 posts to fit snugly against the dock frame, then clean up the cuts and apply a water sealer.
- Notch the Posts. Use a circular saw to make multiple cuts to the required depth for the notch on each post. Clean up the cuts with an oscillating multi-tool or chisel.
- Tip: A multi-tool is great for cleaning up the corners of your notches after using a circular saw.
- Seal the Cut Ends. Apply a water sealer to all the fresh cuts on the posts to protect them from moisture.
Step 2: Install the Dock Posts
At the dock, cut notches in the composite decking to accommodate the posts, then secure the corner and intermediate posts to the dock's frame using lag screws.
- Cut Decking for Post Clearance. Using a jigsaw, carefully cut notches out of the deck boards at each post location so the posts can sit flush against the dock's main frame.
- Secure Corner Posts. Position the notched 6x6 corner posts. Pre-drill holes through the post and into the dock frame, then secure each post with two 3/8" lag screws and washers on each side. Drive a couple of 3-inch #9 wood screws into each post for additional reinforcement.
- Tip: Always pre-drill holes for lag screws to prevent the wood from splitting.
- Tip: Use a post level to ensure each post is perfectly plumb before fully tightening the bolts.
- Common mistake: Forgetting to pre-drill for lag screws, which can easily split the posts or the dock frame.
Step 3: Install Railing Panels
With all the posts installed, attach the pre-fabricated railing panels between the posts using specialized railing brackets and screws.
- Attach Railing Panels. Position a railing panel between two posts. Use railing brackets to secure the top and bottom rails of the panel to the posts, driving screws through the brackets.
- Tip: Use ratchet straps across the top of the posts to pull them into plumb and hold them steady while you attach the railing panels.
Step 4: Build the Gangway
Construct the frame for the floating gangway on shore, using 2x10s for the sides and 2x6s for the internal joists, creating specific slots for the flotation barrels.
- Assemble the Gangway Frame. Build a rectangular frame using 2x10 lumber for the long sides and ends. Use 6x6 blocks in the corners for strength.
- Install Joists and Barrel Supports. Install 2x6 cross-members (joists) inside the frame. Add supports specifically spaced to cradle the 55-gallon barrels that will provide flotation.
- Tip: The frame is designed with specific slots to hold barrels for flotation, but you can add more slots if you need extra buoyancy.
Step 5: Install Gates and Ladder
With the dock fully railed, fabricate and install several gates using cut-down railing panels and hinges. Finally, mount a flip-up aluminum ladder.
- Fabricate Gates. Cut a pre-fabricated railing panel down to the desired width for a gate. Reinforce the cut sides by screwing a 2x6 to each end.
- Install Gates. Attach the custom-made gates to the dock posts using gate hinges.
- Mount the Ladder. Secure the mounting brackets for the flip-up ladder to the dock deck, then attach the ladder.
- Tip: When the ladder is not in use, pull the set pin and flip it up to keep it out of the water and prevent it from getting mucky.
Step 6: Position and Connect the Gangway
The gangway is floated into the water using barrels, positioned between the shore and the dock, and then connected to the dock's entrance gate.
- Float the Gangway. Place two or more 55-gallon barrels under the gangway frame and slide it into the water.
- Connect Gangway to Dock. Position the floating gangway so it meets the entrance gate on the dock. The shore side rests on a concrete slab, and the dock side is temporarily secured with ropes.
- Tip: A simple concrete slab or paver on the shore can provide a stable landing point for the gangway.