Boat decking...cedar vs plywood

[RJMOEN]

I have a 16' modified V flat-bottom boat. I currently have a piece of treated 3/4" plywood in the bottom..but it is a a foot or so short of covering the floor. Debating on cutting a 1/4' piece to cover the gap....OR saw a boat recently on a 4sale site with cedar planking the whole length of the floor. This looks awesome. Anyone know how long cedar might last or how much the weight difference is? Thanks

[Gordie]

The weight difference is alot from ceader to plywood speacilly when it gets wet. Personally I would go with aluminum. I did my whole boat floor in aluminum and will never go back to wood.

[RJMOEN]

which would be heavier plywood or cedar? I would love aluminum but I dont have the cash

[suncruiser234]

3/4 Plywood weighs more. Cedar for the framing also? Never use treated wood on aluminum. I have seen a john boat with planks for decking and it does look sweet!

[RJMOEN]

Just plan on going directly on top of supports? that go from left to right. Why shouldNT I use treated on aluminum? Chemical reaction? Thats what we've used for years. Thanks

[eyebjim]

The new green treated lumber is different than the old stuff. You cant even use non galvanized nails or they corrode.

[chris63]

Around 2004 the Us and Canadian lumber industries discontinued pressure treated lumber containing arsenic as a preservative.The new method uses a chemical called alkaline copper quat.(ACQ)When ACQ treated lumber gets wet the fasteners can corrode quickly.ALUMINUM is especially susceptible to corrosion by ACQ.Use fasteners labeled for use with ACQ.Happy building!c63

[Ufatz]

Cedar strips laid over cedar ribs and all fastened with copper nails or Torx screws.

Last forever. Look good. You be the envy of all your buddies.