Marine grade plywood?

Anyone know where I can get marine grade plywood?
Need one piece 3/4" 4X8 sheet.
Thanks in advance.

I got mine at TH Rogers in McAlester when I redid part of our boat dock. I think I paid about $90 per sheet and that was maybe 2 years ago. I had to have them order it -- not a normally stocked item. But they had it there in about 2 days.

Fox Lumber here in OKC.

My ladder for the boat came today. I have been trying to decide if I need (or want) marine grade plywood or good high quality treated plywood for the carpeted platform. The boat is garaged so never out in the elements long. I'm also think of using gray Starboard and leaving it uncarpeted. Maybe Reaper can chip in with his thoughts on what would be best. Here's a photo of a similar platform with ladder mounted.

Attachment 182215

IkenI
you don't want to use regular treated plywood if there is any chance of contact with aluminum as it corrodes the aluminum.

OB & Ikeni. One note, I have access to a cnc router if you need it. Think perfectly flowing curves or high precision accuracy.

Quote:

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Originally Posted by dinobot

IkenI
you don't want to use regular treated plywood if there is any chance of contact with aluminum as it corrodes the aluminum.

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Thanks for the info, dinobot! I probably should know that, but didn't. That makes me lean, more and more, towards Starboard. It costs more but by the time I buy marine grade plywood and carpet, it's probably a wash.

Quote:

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Originally Posted by Redge

OB & Ikeni. One note, I have access to a cnc router if you need it. Think perfectly flowing curves or high precision accuracy.

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Redge, I think that's over my head. I'm just an old infantry recon guy and know squat about that stuff. Luckily, I have a friend who has a huge workshop and could most likely build the platform and mount it on the boat in a couple hours. There is a small wedge needed so I'll talk to him.

Thanks, guys!

You'd be fine with an exterior grade plywood treated with some type of spar urethane. Then the plywood can touch aluminum. Whatever you do, don't use interior plywood. The price difference between a good exterior and marine is minimal. I want to say $10 or so. Whatever way you go be sure to coat it up good with spar urethane.

Sintra is a PVC Foam board that is lighter than plywood, is waterproof, is UV stable. I've used it for seats, seat backs and various covers, to date none have failed so it may be something worth investigating

Thanks everyone for your inputs, great stuff!
I found a store in Ardmore that ordered me a sheet of marine grade plywood yesterday and should have it tomorrow latest Cost was
$88 total so I'm a happy camper!
Turns out its not as bad a job as I had expected!
Floyd, did you build the platform the ladder attaches to? Looks like a factory install!