Aluminum Floor Thickness Issues

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Shoedawg

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I am having some issues about the thickness of the aluminum floor I want to install. I have four support beams that run parallel on the bottom of the boat, which supported the old rotted wood floor. The spans between each beam is as follows in the picture below:

IMG_0058a.jpg

As you can see from the measurements above, the spans between the beams are small, with the exception of the middle one being about 11". My question is, how thick of a aluminum floor should I get? I think 1/8" (.125) seems a little thick and will add a lot of weight. Plus with the spans and beams offering support, I am assuming I can get by with 1/16" (.063), 5/64" (.080) or 3/32" (.090).

Will 1/16" cause to much flex, even though I have small spans?

Or should I move up to 5/64? Just worried about flex and weight.

The floor in length will run about 8.5ft. See pic below.
image001.jpg
 
Weights for 5052 sheet aluminum:

Weight/Square Foot: 1.2571 for 0.090" x 34 sq-ft = 42.75 pounds

Weight/Square Foot: 1.1174 for 0.080" x 34 sq-ft = 38 pounds

Weight/Square Foot: 0.88 pounds for 0.063" x 34 sq-ft = 29.92 pounds

I don't see much difference between the 0.080" and 0.090" in weight (~5-pounds) but would not use the 1/16" myself. That said, with no coring, I'd be inclined to use the 0.090" and whereas that is a more common mill size ... it may actually be cheaper.
 
Thanks for the reply Dale and adding up the weights. I didn't think .090 would be a common mil size and cheaper (potentially). Most of the Tinners on here use various sized thicknesses from .090 to .125, I just think .125 would be over kill for the set-up I have. The going thickness seems to be about .090. I assume there is little flex to .090 and should be more than enough support for my floor.

I have seen others that have recommended .125 for front casting decks. Do you think .090 will be enough (with proper structural support/design) to support one?
 

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