How to Repair or Replace Vinyl Flooring on a Pontoon or Bowrider

Clean the floor before judging the damage. Avalon recommends scrubbing pontoon decking with a non-skid cleaning solution; for vinyl, use a mild boat soap and a soft brush unless your flooring maker says otherwise, and rinse well. Let it dry completely. Then mark every cut, puncture, lifted edge, bubble and stained spot with painter's tape.

This is the most important step. Walk the whole floor slowly, especially around seat bases, the helm, the ladder, cleats and any screw holes. Press with your heel and probe screw holes with an awl. Epoxyworks explains that pontoon and runabout floors are plywood fastened to cross-members or stringers, and that water gets into the wood through the end grain at screw holes and through an unsealed underside. Once the plywood starts to delaminate, the deck feels spongy underfoot.

What it means: firm deck everywhere: carry on with the repairs below. Spongy, soft, sagging or a screw that just spins: the wood is rotting and the vinyl repair should wait until the deck is fixed (step 9). Patching vinyl over rotten plywood only hides the problem.

Use the adhesive your flooring maker names, or one the adhesive maker says works on that flooring outdoors in a marine setting. As an example, the Sailrite listing for Infinity woven vinyl says it should be glued down with a solvent-free, latex resin adhesive that works with vinyl, and names a specific marine and exterior adhesive. General points:

• Indoor household floor glue is not made for sun, rain and standing water.
• Some solvent-based contact cements can attack certain vinyl backings or foams; check compatibility on a scrap first.
• Seam sealers are made to "weld" vinyl edges; use one rated for your flooring type.

For a clean cut or a small puncture in sheet vinyl:

1. Trim away loose, frayed fibers with a fresh blade without enlarging the cut.
2. Clean and dry the area.
3. If the edges have lifted, slip a little adhesive under them with a putty knife and press them flat.
4. Run a thin bead of compatible seam sealer along the cut and wipe off any excess as its label directs.

On woven vinyl, a tiny snag can often be pressed back and glued; a torn strand area is usually a patch job (step 7).

Edges and seams lift when water gets under them or the adhesive fails.

1. Lift the loose edge gently and scrape out old, loose adhesive and dirt.
2. Let the deck underneath dry fully; trapped moisture will lift it again.
3. Spread a thin, even coat of adhesive with the tool the label calls for.
4. Press the vinyl down, roll it firmly from the center toward the edge, and wipe off squeeze-out.
5. Cover with wax paper, a flat board and weights, and leave it for the full cure time.
6. Finish seams with seam sealer if your flooring maker recommends it.

Where an edge meets the deck rim, make sure the trim or edge seal is back in place so water can't wick under the floor.

A bubble means the vinyl has let go of the deck. Make a small slit in the bubble along the pattern or grain so it won't show. Press out trapped air or water, let it dry, work a small amount of adhesive under the flap, then roll it flat and weight it until cured. If bubbles keep appearing in one area, suspect moisture in the plywood below (step 2).

For a burn, a deep gouge or a torn section:

1. Find a matching remnant. Owners often save offcuts or take a piece from under a seat base or console where it won't be seen.
2. Lay the remnant over the damage, lining up the pattern exactly, and tape it in place.
3. Cut through both layers at once with a straightedge and a sharp blade (a "double cut"), making a square or a shape that follows the pattern.
4. Remove the damaged piece, clean and dry the deck, and check the plywood under it.
5. Glue in the new piece, roll it, and seal the edges with seam sealer as your flooring maker recommends.
6. Weight it and let it cure before walking on it.

Every screw through the floor is a path for water into the plywood. When you reinstall seats, pedestals or rails, seal each hole. Epoxyworks recommends coating fastener holes in a pontoon deck with epoxy before driving screws, and sealing them again whenever deck hardware goes back in. On an aluminum pontoon, keep stainless fasteners from touching the aluminum directly where your builder uses isolating washers. See our through-bolting guide.

Epoxyworks is clear that once moisture has damaged the plywood, the only real fix is to replace the affected wood. In outline, the way a pro (or an experienced DIYer) does it:

1. Remove the furniture and flooring over the soft area.
2. On a pontoon, remove the fasteners holding the plywood to the cross-members; keep the old panels as patterns if you can.
3. Cut out a partial section only back to solid wood, with joints landing on a cross-member or on added support cleats.
4. Cut new marine plywood matching the original. Mercury's article on re-decking advises using the same type and the same thickness the builder used: plywood treatments differ (some cause corrosion problems on aluminum boats), and a heavier or lighter deck changes the boat's weight and how it sits in the water.
5. Seal it with epoxy on the back, the edges and inside every fastener hole before installing; Epoxyworks stresses the edges and holes on pontoon decks.
6. Fasten it down, then lay the new flooring once the epoxy has cured.

On a bowrider, the floor is usually bonded to the hull and stringers with fiberglass, and Epoxyworks warns that the hull must be supported before the floor comes out or it can lose its shape. Soft floors in a bowrider can also mean wet stringers or foam. That is a pro job; see our transom and stringer rot guide.

A note on wood choice: ask your builder or dealer what plywood to use. Some pressure-treated lumber contains copper compounds that corrode aluminum, so it should not touch pontoon cross-members unless your builder approves it and it is properly isolated.

When the whole floor is worn out, the job usually goes like this:

1. Photograph and label every piece of furniture and its hardware, then remove it all.
2. Pull up the old flooring and scrape off old adhesive.
3. Inspect the entire deck, replacing soft plywood and sealing every hole.
4. Unroll the new flooring and let it relax in the sun or a warm space so it lies flat.
5. Position it, fold back half, spread adhesive, lay it in and roll it from the center out. Repeat with the other half.
6. Trim the edges carefully, refit edge trim, and let the adhesive cure fully before reinstalling furniture.
7. Reinstall the furniture, sealing every fastener.

This takes most owners a few weekends. Many dealers and upholstery shops offer floor replacement if you'd rather not.

Thinking about foam decking instead? Closed-cell EVA/PE foam (SeaDek-type) is a popular replacement on fiberglass decks and casting platforms. From BoatUS's hands-on reports:

• Templates first: clear Mylar taped tight over the area and traced with a permanent marker; simple rectangles are easy DIY, compound curves and round hatches are better templated and cut by a dealer.
• Prep decides how long it lasts: scrub, rinse and dry the deck, then wipe it with acetone or alcohol (some makers want an ammonia cleaner first) so no wax remains. Poor prep, or foam that doesn't sit on smooth surfaces, tends to start lifting after about three years.
• No second chances: the peel-and-stick adhesive grabs instantly, so tape one half in place, peel and press the other half, then repeat.
• Expect a warranty of about three years and a claimed life of five to seven, and watch for "sunburn": sun reflected off a fitting or white gelcoat can occasionally melt a patch of foam.
• Glued-down PVC "faux teak" is another option, but BoatUS notes it is meant to be permanent, while EVA foam can be peeled off later.

• Rinse sand and salt off after use and scrub occasionally with a mild boat soap.
• Avoid harsh solvents and strong bleach unless the flooring maker allows them.
• Keep rubber-backed mats, cheap rubber-soled sandals, wet leaves and dyed cushions off the vinyl for long periods. Flooring makers' care sheets warn that rubber, tannins from leaves, inks and dyes can leave stains that never come out.
• Go easy with a pressure washer: a narrow jet held close can lift seams and edges and force water under the vinyl. A soft brush and a hose do the job.
• Let the floor dry before covering the boat. Avalon warns that carpet and vinyl can breed mildew under a cover with little ventilation.
• Use a well-supported cover so rain can't pool on the deck; see our mold and mildew guide.