Senior Marine Service Advisor & NMEA Electronics Specialist // 35,000 Miles
“USCG Licensed Captain and NMEA-certified technician with 22 years of experience in powerboat diagnostics and offshore communication systems.”
Continue your journey with these curated navigation guides.
Is your pontoon sluggish? We break down the technical upgrades to increase your top speed, from underskinning and lifting strakes to prop pitch optimization and engine height adjustment.
Stripping a pontoon to the bare logs? Our 3,500+ word masterclass covers everything from pressure testing aluminum tubes to electrical overhauls and deck material science.
Is the third log worth the $10,000 upgrade? We break down the physics of hydrodynamic lift, the 'V-hull' banking illusion, and the structural engineering of performance pontoon hulls.
If you are reading this, you’ve likely felt the "spongy" flex of a rotten floor beneath your feet. Or perhaps you are looking at a 20-year-old pontoon and wondering if you should stick with the traditional wood deck or upgrade to something "immortal."
Replacing the deck of a pontoon is the most labor-intensive project you can undertake. It requires stripping the boat to its bare aluminum cross-members, which means removing the engine, the console, every seat, and every inch of the aluminum fencing. Since you are going to spend 40 to 60 hours of your life on this restoration, the decision of which material to put back down is the difference between a 10-year repair and a lifetime solution.
As a marine service advisor, I have seen every decking failure imaginable. I’ve seen aluminum decks that resonate like a drum, plywood decks that dissolved because of the wrong chemical treatment, and PVC panels that cost more than the boat's engine.
In this authority guide, we are going to dive into the technical physics of weight, thermal conductivity, structural resonance, and the actual chemical bonding requirements of Marine Plywood, Aluminum panels, and PVC composites.
For 50 years, plywood has been the dominant choice for pontoon decking. It is relatively inexpensive, easy to work with, and provides excellent vibration damping. However, not all "treated" wood is created equal.
The CCA Requirement: You must use Chromated Copper Arsenate (CCA) treated marine plywood. Do not, under any circumstances, use the "Pressure Treated" plywood found at a local hardware store (which is usually ACQ or Copper Azole).
Pros of Plywood:
Cons of Plywood:
Want the exact weight and cost-per-square-foot data for all three materials? Download our 2026 Decking Buyer's Guide to see the side-by-side technical specs for your specific boat length.
Expert material analysis from the BoatGuider team. 100% Free.
In the last decade, high-end manufacturers like Barletta and Bennington have begun offering all-aluminum decking systems. For a DIY restoration, this is the ultimate "once and done" solution.
The Physics of Rigidity: Aluminum decking usually consists of hollow-core, interlocking extruded panels. These panels are significantly more rigid than plywood. When you step on an aluminum deck, there is zero "give." This stiffness translates to a more stable feeling at high speeds and in rough water.
The Weight Paradox: While aluminum is light, the heavy extrusions required for a deck are often heavier than plywood. A 3/4" aluminum panel system can weigh up to 15% more than a marine plywood deck. On a tritoon with a high-horsepower motor, this doesn't matter. On a 20-foot twin-log boat with a 50hp motor, that extra 100 pounds can noticeably decrease your top speed and buoyancy.
Pros of Aluminum:
Cons of Aluminum:
If money is no object and you want the absolute best of both worlds, you look at Coosa Board or similar high-density PVC composite panels.
The Chemistry of No-Rot: Coosa board is a high-density, closed-cell polyurethane foam reinforced with layers of woven roving and continuous strand fiberglass. It is not "plastic" in the traditional sense; it is a structural composite panel.
The Weight Advantage: This is where Coosa board wins. It is 40% to 60% lighter than marine plywood while maintaining the same structural stiffness. Replacing a 600-pound plywood deck with a 300-pound Coosa deck will significantly increase your boat's buoyancy, draft, and speed. It is like gaining an extra 3-4 horsepower just through weight reduction.
Pros of PVC Composites:
Cons of PVC Composites:
Before you can install your new material, you must face the "Mechanical Strip." This is the part of the project that leads most DIYers to quit.
The Console Disconnect: The helm console is the nerve center of the boat. To remove it, you must carefully label and disconnect the steering cable (or hydraulic lines), the throttle/shift binnacle, and the entire electrical wiring harness.
The Motor Pod Challenge: If your pontoon uses an integrated motor pod (the "transom" for the outboard), the plywood often runs under the motor mounting brackets.
How you glue your new flooring (woven vinyl or carpet) depends entirely on which material you choose.
Bonding to Plywood: This is the easiest. Most high-temp marine adhesives are designed to "bite" into the porous grain of the wood. You apply the glue with a notched trowel, let it tack up, and roll the vinyl down. The bond is permanent.
Bonding to Aluminum: This is the most difficult. Aluminum is non-porous and smooth. Standard wood adhesives will not stick. You must use a specialized, high-solids solvent-based adhesive. Furthermore, you must "scuff" the entire surface of the aluminum with a grinder or heavy-duty sandpaper to create a mechanical "profile" for the glue to grab onto. If you don't, the vinyl will bubble and peel off the first time it hits 100 degrees.
Bonding to PVC (Coosa): Because Coosa board is fiberglass-reinforced, it bonds incredibly well with polyester resins and marine adhesives. It is the gold standard for "no-peel" longevity.
Regardless of which decking material you choose, the hardware that holds it to the frame is the #1 point of failure.
The "Elevator Bolt" Lore: You must use 316-grade Stainless Steel Elevator Bolts. These have a large, 1-inch flat head that pulls flush into the decking material.
The "Zinc" Warning: Never use zinc-plated or galvanized bolts. The chemicals in CCA-treated wood and the moisture in the marine environment will eat the zinc coating in a single season. Once the bare steel starts to rust, it will bleed through your new vinyl and eventually rot the core of your deck from the hardware out.
One of the biggest complaints with aluminum or composite decking is the increase in noise. Plywood is naturally quiet, but the other materials can act like a resonator.
The Rubber Isolation Strategy: Before you lay your new decking (of any material) onto the aluminum cross-members, apply a 1/8" thick strip of EPDM Rubber or heavy-duty marine foam tape to the top of every cross-member.
| Material | Cost per Sheet (3/4") | Full Deck Cost (22') | Lifespan | Difficulty |
|---|---|---|---|---|
| Marine Plywood (CCA) | $120 - $150 | $1,200 | 15-20 Years | Easy (Standard Tools) |
| Aluminum Panels | $500 - $750 | $4,500 - $6,000 | Lifetime | Hard (Special Glue/Fitting) |
| Coosa Board (PVC) | $450 - $550 | $4,000 - $5,000 | Lifetime | Easy (Standard Tools) |
If you choose the plywood route, don't just trust the guy at the lumber yard. You need to verify the stamp on the wood.
The APA Stamp: Look for the APA (Engineered Wood Association) stamp. It should specify PS 1-09 (the structural standard for plywood). The "Marine" Designation: True marine plywood must have a grade of A-A or A-B, meaning the face and back plies are of high quality with no open knots. If the stamp says "C-D Plugged," it is not marine plywood; it is standard exterior plywood that will fail prematurely on a boat.
If you are going through the effort of a deck restoration, you should almost certainly "underskin" the boat.
The Aluminum Shield: Underskinning involves riveting thin sheets of aluminum (usually .063 gauge) to the bottom of your cross-members.
Choose CCA Marine Plywood if: You are on a budget, you want the quietest possible ride, and you plan on keeping the boat for another 10-15 years. It is the most logical choice for 90% of DIY restorations.
Choose Aluminum Interlocking Panels if: You have a high-horsepower tritoon, you want a "stiff" performance feel, and you never want to think about the floor again for the rest of your life.
Choose Coosa Board if: You have a small pontoon where every pound of weight matters, or you are building a custom "forever boat" and want the absolute best performance-to-weight ratio available in the marine industry.
The biggest mistake I see in my shop is people who spend $5,000 on the deck and then mess up the vinyl installation.
Once your new deck is installed, you need a different maintenance mindset.
For Aluminum Decks: You must rinse the deck with fresh water after every use if you are in a saltwater or brackish environment. Even though aluminum doesn't "rot," it can develop "pitting" or surface oxidation if salt is trapped between the vinyl and the metal.
For Plywood Decks: The enemy is standing water. Never store your boat perfectly level. Always tilt the trailer tongue as high as possible so that any water that gets under the seats can drain out the back. If water pools on the vinyl, it will eventually find a way through a bolt hole and start the rot process all over again.
A pontoon deck restoration is a rite of passage for many boat owners. It is a grueling, messy, and expensive project, but it is also the most rewarding. By moving away from water-trapping marine carpet and choosing the right combination of decking material and stainless hardware, you are transforming an old boat into a modern, high-performance vessel.
Take your time, weigh the costs vs. the weights, and don't skimp on the adhesive. Whether you choose the reliable value of CCA plywood, the immortal strength of aluminum, or the high-tech lightness of Coosa board, your "floating patio" will be solid for decades to come.
Stay safe, measure twice, and I'll see you on the water!
As the price of lumber has fluctuated, I have seen a rise in "Counterfeit" marine plywood. A salesman might tell you that "Exterior Grade" is the same thing—it is not.
Standard ACQ exterior plywood allows for internal voids (hollow spots) in the center plies.
The only time you will ever see your boat's "Skeleton" is when the deck is removed. Do not waste this opportunity to inspect the aluminum cross-members.
Pontoons flex. Over 20 years, the welds where the Z-bars (cross-members) meet the logs can develop stress cracks.
You will likely find a layer of white, chalky powder on top of the aluminum bars. This is aluminum oxide (corrosion).
A squeaky pontoon deck is usually caused by the wood "sawing" against the bolts as the boat flexes in waves.
Replacing your pontoon decking is a monumental task, but it is also the only way to ensure your boat is safe for the next generation. By choosing CCA Marine Plywood, utilizing 316 Stainless hardware, and adding Underskinning, you are building a boat that is technically superior to the day it left the factory.
Don't rush the strip-down, don't skimp on the adhesive, and for heaven's sake, inspect those cross-member welds.
I'll see you at the ramp.