If you're thinking about redecking a pontoon, you've probably noticed that while your boat's aluminum logs might be in great shape, the floor under your feet feels a little too much like a trampoline. It's a common reality for pontoon owners. Most of these boats are built with high-quality aluminum hulls that can last thirty or forty years, but the marine plywood and carpet they're topped with usually give out after ten or fifteen.
Taking on a redecking project might seem like a massive headache, but honestly, it's one of the most rewarding DIY projects you can do for your boat. Not only does it save you thousands of dollars compared to buying a new vessel or paying a shop to do it, but you also get to customize the layout exactly how you want it. Let's walk through what this process actually looks like from the perspective of someone who's been elbow-deep in old carpet glue and rusted bolts.
Knowing When It's Time to Bite the Bullet
How do you really know if you need to start redecking a pontoon? Sometimes it's obvious—like when your foot literally goes through the floor near the gate. Other times, it's more subtle. If you notice a musty smell that never goes away, or if the floor feels "spongy" when you walk near the edges, that's the wood delaminating.
The biggest enemy of your deck is trapped moisture. Old-school marine carpet is notorious for this. It holds water against the wood for days after a rainstorm, eventually leading to rot. If you peel back a corner of the carpet and the wood underneath looks like wet cardboard or has dark, black spots, it's time to stop patching it and start planning a full replacement.
The Part Everyone Hates: The Teardown
I won't sugarcoat it—the hardest part of redecking a pontoon is getting the old stuff off. You have to strip the boat down to the bare aluminum cross-members. This means removing the furniture, the console, the railings, and eventually the old wood itself.
Most pontoon furniture is held down by simple bolts, but since they've likely been sitting in moisture for a decade, they're going to be stubborn. Get yourself a good impact driver and a lot of penetrating oil. You'll also want to label every wire you disconnect from the helm. There's nothing worse than finishing a beautiful new deck only to realize you have no idea which wire goes to the horn and which one goes to the navigation lights.
Once the furniture and railings are off, you're left with the old plywood. It's usually attached with elevator bolts or self-tapping screws. If they're rusted shut, don't waste your time trying to unscrew them perfectly. A grinder with a cut-off wheel or a big pry bar will become your best friend here. Just be careful not to damage the aluminum cross-members underneath.
Choosing the Right Materials
When you get to the stage of buying materials for redecking a pontoon, do not try to save money by heading to a big-box hardware store for standard pressure-treated lumber. Standard treated wood contains copper, which reacts horribly with aluminum. If you put that on your boat, your aluminum frame will start to corrode through a process called galvanic corrosion.
You want marine-grade plywood. It's usually CCA-treated (Chromated Copper Arsenate), which is safe for aluminum. It's also built with waterproof glue and has fewer internal voids, so it won't rot out in three years. Most pontoons use 3/4-inch sheets.
For the flooring itself, most people are ditching carpet entirely. Woven vinyl is the new gold standard. It's easy to clean, it doesn't hold water, and it feels great on bare feet. Plus, it looks much more modern. If you're on a budget, you can still find decent marine carpet, but just know you'll probably be doing this whole project again sooner than if you went with vinyl.
Getting the New Deck Down
Once you have your bare aluminum frame cleaned up, it's time to lay the new wood. This is where the project starts to feel like you're actually making progress.
A pro tip for redecking a pontoon is to use the old wood as a template if it's still in one piece. If not, you'll be doing a lot of measuring. You want the seams of the plywood to land directly in the center of the aluminum cross-members so they have plenty of support.
When you're ready to fasten the wood down, you have a few options. Some guys swear by stainless steel bolts and nuts, while others prefer deck screws designed for pontoons. Whatever you choose, make sure you use a marine-grade sealant on the edges of the plywood. Even though it's "marine grade," sealing the edges helps prevent "wicking" where water gets into the ends of the grain and starts the rotting process.
The "Make or Break" Step: The Glue
If you're using vinyl flooring, the glue-down process is the most stressful part of redecking a pontoon. You usually have one shot to get it straight. You'll want to spread the marine adhesive evenly across the wood using a notched trowel.
Don't try to do the whole boat at once. Do it in sections. Lay the vinyl down, use a heavy floor roller (you can rent these) to push out any air bubbles, and make sure you have a sharp utility knife for trimming the edges. If you leave air bubbles under the vinyl, they'll expand in the sun and look like giant blisters. Take your time here.
Putting the Puzzle Back Together
Now comes the fun part: reassembling the boat. Since you've already labeled your wires (right?), hooking the console back up shouldn't be a nightmare.
When you're putting the railings and furniture back on, you might find that you want to change the layout. This is the perfect time to do it. Maybe you want more floor space for fishing, or perhaps you want to move the L-shaped couch to the other side. Just keep in mind the weight distribution of the boat.
One thing people often forget when redecking a pontoon is to check the condition of the wiring while everything is exposed. If your boat is old enough to need a new deck, it probably has some questionable wiring. While the floor is off, it's incredibly easy to run new wires for underwater lights, better speakers, or a new depth finder.
Is the Effort Worth It?
By the time you finish redecking a pontoon, you'll probably have sore knees and a few scratches on your hands, but the transformation is insane. You take a boat that looked like a "project" and turn it into something that looks like it just rolled off the showroom floor.
Financially, it makes a ton of sense. You can usually redeck a standard 20-foot pontoon for somewhere between $1,500 and $2,500 in materials, depending on how fancy you get with the flooring and hardware. A brand-new boat of the same size could easily run you $35,000 or more.
At the end of the day, a pontoon is basically just a floating patio. If the "patio" part is solid, clean, and comfortable, nobody cares if the aluminum logs underneath are twenty years old. You get the same sunset, the same cold drinks, and the same memories with your family, just without the $500 monthly boat payment. So, if your floor is feeling a little soft this season, don't trade the boat in—just get to work.