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The M store has marine grade plywood and it is labeled as such. This stuff is not treated, so corrosion is not a problem. It does need to be sealed to slow down rot and damage. I am using spar varnish. From what I have read, you need to cut the wood to the shape(s) you need and then seal it. Pay particular attention to the cut edges.
Does anyone know where i can find some marine grade plywood in NE GA? i need to replace a couple on the pontoon boat. thanks, pic of the boat that i'm talking about.
This is a very simple project-don't waste your time and effort trying to buy a factory piece. As Cliff says, get some marine grade plywood and seal the hell out of it. Surely somewhere in MN you should be able to get marine ply. Three-quarter is perfect buy if you can only get 1/2 just use two pieces glued together with a good glue.
where to buy marine plywood??? Thread starter goob; Start date Mar 21, 2005; Mar 21, 2005 #1 goob Senior ...
Lund didn't use marine grade in their older boats at least. CDX in everyone I have been involved in replacing. 5/8 or 1/2" thickness. Yes to seams. I polyurethane coated mine, including edges when I replaced mine and I used marine grade. Google boat vinyl flooring and you'll find lots of options. I went with carpet from an eBay seller.
The boards will cup while the plywood will not. Plywood will de-laminate however. I would go with 3/4" treated plywood. Pick through the pile till you find a sheet thats dry. Let it bleach out and dry a season then put on a few coats of Man o War Marine Spar Varnish, get the edges too.
I used 3/4 inch marine grade, guaranteed for 100 years, plywood. man was that stuff spendy. $88 per 4x8 sheet. it took three sheets by the time I did everything. new bench tops up front, rear access doors for the battery, plug/bilge pump area/fuel tank area, and the side holding areas on either side of the boat.
But the treated plywood available at most lumber yards is not engineered for horizontal applications, it is designed for verticle applications. Feedback I have gotten from customers: 1) BC exterior grade plywood works well. 2) Fill any imperfections in the top surface of the plywood with floor levelor rated for exterior use.
Another really cool thing that I remember is that the floor is honeycomb aluminum rather than plywood. So no rot as the boat gets to be twenty years old. Double check the warranty transfer though, as Crestliner does not transfer their lifetime hull warranty to subsequent owners. Monark may or may not.
The boat is a 2008 Lowe 1436L, the trailer is a 2009 continental, and the motor is a 2007 Mercury 9.9 four stroke. Everything was bought 5 weeks before the finished pics were posted. Boat and trailer bought new, motor slightly used. deck frame - 1/8 x 1-1/4 x 1-1/4 aluminum angle.