I've installed diamond plate floors on several boats. Its much lighter and more durable than (what are usually stock) wood floors, but there are a few considerations to be made when making the switch.
Noise is an issue. Wood floors dampen both noise and vibration. I've made a habit of putting down a layer of silicone (with a caulking gun) prior to laying down diamond plate floors and this helps a lot, but noise from water displacement and waves will be more noticeable.
Weight & bracing. 1/8" thick diamond plate is easy to work, light, and reasonably strong on its own, but if the gaps between bracing under the diamond plate floors are too great then you may have to add some bracing or use thicker (3/16" thick) diamond plate to prevent sagging (when you step between a gap in the bracing and the floor sinks down a bit). You'll notice in one of the pictures that I added extra side to side bracing under the floors to better support the 1/8" diamond plate that I used.
Grade makes a difference. There is 3003 tred-brite, and then there is 5052 diamond plate as well. If you're just going to be screwing or riveting the floor down then 3003 is a fine choice, but if there is any welding or forming involved, then you'll want to opt for the more expensive 5052 grade.
All of the diamond plate that I can find locally (West Coast Metals, Pacific Metals, Alaskan Copper & Brass) Is mirror finish (#8, super shiny). The shininess fades quickly with use, and you can hit it with a coarse scotch-brite pad on a random orbital sander to dull it faster, or of course you can have it sand blasted (at extra cost and butt-pain... sand-blasting is nasty without the right setup). I dont think that paint would adhere well to the factory #8 finish without a lot of prior prep. If anyone knows where to buy 4x16 or 5x16 sheets of matte dimaond plate, I'd love to know. One of the pictures that I've attached (the one taken in the dark boat shed) has ~two year old diamond plate floors in it. As you can see, they've dulled up nicely after two years of use and turned more matte in finish. They started bright and shiny like the flatbottom with the yamaha main.
If you're looking to source some sheets or need someone to talk to on this topic, please PM me. Happy to quote the work too, but I'm more of a stainless guy, and I'm sure there are some sponsors on this site who are more specialized for this (not trying to steal their workload).
Cheers!
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