Marine grade plywood?

[Okie Bob]

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

[OK Toon]

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.

[DrNip]

Fox Lumber here in OKC.

[IkenI]

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.

[Crappie Reaper]

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.

They say that a wise man learns from his mistakes. When I rebuilt the USSPOS, my research let me know that treated plywood would corrode the aluminum. Instead of using Marine plywood, I chose to use a cheaper B/C grade and treated it with Thompsons water sealer. When I lived in Oologah, I could keep the boat garaged and never had a problem. When I moved to Talala Creek, the shop filled up fast and I didn't have the space to keep the boat inside. In less than 6 months, the carpet glue started giving up it's bond. I blame it on the Thomsons.

I'm fairly certain Floyd that if you use regular plywood and coat it with a good exterior primer that you'll have enough protection since you keep it garaged. Sealers like Thomsons just don't allow an exterior carpet glue to properly bond to the plywood.

I came across a Ranger 373v recently that may need extensive work to restore. I might try to do some horsetrading with the guy that has it. He doesn't know he's getting rid of it yet.

[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.

[Redge]

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

[IkenI]

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

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.

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

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!

[DrNip]

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.

[BuckeyeKdog]

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