Which type of plywood should I use?

[Zq8 Blazer]

I have a Monark 1660 Jon boat and I don't use it a lot(maybe 3-4 times a year), but the deck on it is very small and I would like to extend it so that I can mount a seat up front. Should I use marine plywood or pressure treated plywood with a lifetime warranty? I know marine is probably the best, but with it seeing as little use as it does I didn't know if it would be worth the extra money.

 

[Scott Danforth]

Exterior grade ACX.

Dont use pressure treated on aluminum. The chemicals thet use to treat the wood will corrode the aluminum

 

[Zq8 Blazer]

Like this? Does it need to be coated in anything? https://www.menards.com/main/buildi...4-x-8-premium-acx-plywood/p-1444424214850.htm

 

[Scott Danforth]

You only need the 1/2 thick, however yes. Menards premium is araucoply which has more thinner layers resulting in more strength

 

[Zq8 Blazer]

Ok thanks. I appreciate the help.