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Old 29 June 2009, 23:30   #1
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Thickness of marine-grade plywood

Hi,

I'm going to be building my two-piece floor (Futura Mk2) tomorrow. I have the choice of 3/4" (19mm) or 1/2" (12.5mm) marine-grade plywood. Can someone tell me which thickness I should choose. I would prefer to keep the weight down, but am willing to sacrifice if necessary.

Thanks,

Vince
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Old 30 June 2009, 02:47   #2
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How thick was the original floor, was it wood or alloy?
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Old 30 June 2009, 08:47   #3
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Hi,

I don't know. My current floor is an H2P air deck.

Vince
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Old 30 June 2009, 09:17   #4
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Half inch marine plywood might be OK, 5/8" should be plenty, 3/4" is very heavy duty. The highjackers will give additional longitudinal support compared to a conventional inflatable keel. My boat model uses 5/8" marine mahogany plywood as the standard thickness, but I opted for 3/4" marine for the extra strength and rigidity. For me the extra bit of weight was well worth it. My 3 main aft floorboards (~ 48" x 36" per board) weigh close to 50 lbs each.

Can you also get 5/8 marine plywood? Is your supplier able to tell you the weight/meter2 of these different thicknesses. From there, if you roughly calcuated the surface area of your floorboards, you can determine whether the incremental weight increases are acceptable to you.
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Old 30 June 2009, 09:53   #5
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I'd go for the thicker stuff!
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Old 30 June 2009, 10:31   #6
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Keep in mind that I have only a 25hp motor. I would like to keep it light but not if it means using thinner than recommended. I don't want to overkill it for the sake of it, either.
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Old 30 June 2009, 10:43   #7
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If weights an issue can't you get some fibreglass ones made?
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Old 30 June 2009, 10:59   #8
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Quote:
Originally Posted by chewy View Post
If weights an issue can't you get some fibreglass ones made?
That's a pretty sweet idea actually. I'll look into it. For the time being (and I mean for my fishing trip 2 days from now), I'd like to use wood.
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Old 01 July 2009, 09:13   #9
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After having had both aluminum and marine mahogany plywood floorboards, I much prefer wood for the following reasons:

- Marine plywood is considerably less expensive.

- If using a suffficient thickness, marine plywood it is much more rigid.

- Marine plywood is very easy to modify and customize in terms of anchor points for your particular needs & deck layout.

- You can easily & quickly make additional/spare floorboards. This way, depending on what tasks you may using your boat for, you can install specific floorboards that are set up for that particular task. This is why a good sized SIB can be considerably more versatile than a RIB of similar size.
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Old 02 July 2009, 10:05   #10
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If you painted the floor, would you get away with exterior ply, as the floor is not submerged? And if so, what paint do you use on them?
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