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Somewhat historically subflooring was a slightly better grade of true plywood. Either 3\4" or 1 1\8". Waterproof glue, fewer voids
It's still available, but has mostly been replaced by OSB.
Marine ply is great, but big $$. MDO is where it's at. Slap a coat or two of penetrating epoxy, maybe some spar varnish.
My rower's compartment floor is 5\8" MDO with a marine vinyl\linoleum over top for no slip, and wear. 20 years old and still (mostly) good as new.
Marine ply if you're actually building boats:
  • Marine ply doesn't have voids in the core
  • no other plywood bends as consistently as marine ply
  • no voids means no trapped water
  • marine ply for boats below the waterline
  • And the best news is that it's really, really expensive!
But how often are we taking our rafts out? 30 days is a pretty busy year. And maybe they sit in the water overnight for half of those days if we're lucky? 14 days/year is not exactly a boat that spends 24/7/365 with the hull submerged in the water.

MDO is totally where it's at. Sign plywood. made to be out in the weather 24/7/365.

Construction plywood and underlayment use waterproof glues, but aren't intended to be out in the weather more than 2-3 months while you're framing your house and before you get the roofing on.
 
They’re pretty smooth when you cut them. I didn’t find the need but no harm in trying. I’ve been running It in the bottom of my everything and drop bags for probably 1k miles and haven’t seen any issues.
They’re pretty smooth when you cut them. I didn’t find the need but no harm in trying. I’ve been running It in the bottom of my everything and drop bags for probably 1k miles and haven’t seen any issues.
When you say “at the bottom of my everything bag” do you mean as a beaver tail suspending the bag or inside the bag as a flat surface? Tuff River Stuff claims there is no need to suspend gear in modern floors but I find that hard to believe. If you are not using it as suspension, what do you use, if anything? I always liked the idea of an everything bag that has the external d-rings to suspend the bag but I question the durability without support straps seen across the bottom of the bag. Thoughts?
 
Inside the bag as a flat surface. That way when i put propane or metal boxes back there they cant dig into my floor. I have a pacific river bag I use and that keeps most of the weight suspended on the tubes depending on how anal I am with it but honestly it never seems to hurt the floor of the boat with that poultry deck sitting on the bottom.
 
Yeah, where do you get that stuff?
Poultry/kennel flooring. There was a lot of discussion here several years ago. Several people noted that it didn't work well over time as a suspended floor because it would sag.

 
I’m using plywood and going cheap because I don’t spend mush time in my raft. I’m on whitewater when I do. So, what distance are yall keeping between the floors and tubes? I’m not concerned about foot entrapment. I’m concerned about the boat not being able to flex and rubbing
 
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