Uneven plywood floor

[johnc3211]

I am in the process of repairing a rotted floor area in my Hideout. I will try hard to get the patch flush with the existing floor, and as narrow as possible joints. I know from remodel jobs at home that patched subflooring is hard to get smooth for sheet vinyl. I have used skim coat to make a bathroom floor smooth, but it was 2 layers of 3/4 plywood and doesn't really flex. Watching someone walk through the camper you can see the floor "give" a little bit with each stap. I fear traditional skim coat would break up from the flexing. Does anyone have excperience with some sort of flexible skim coat product. My floor is 3/4 plywood with the patch seams centered on floor joist 2x's.

 

[DutchmenSport]

What are you putting on the top floor? Vinyl squares, replacing the entire floor with Vinyl, planking, something else?

If using Vinyl, either squares, or self sticking tiles, then what you need to do is simply install the wood plywood and then use Vinyl flooring glue and spread it on top of the plywood. Let it dry over night. It might still be stick and tacky the next day, that's ok. Now, apply the new Vinyl flooring tiles.

I found this works very, very well on any wood floor. Self-sticking tiles do require a completely smooth surface to stick to. But, using a rubber floor tile glue, you spread it on, smooth it out and it will level, as smooth as you make it. It's a rubber texture, flexible, and the tiles will never, never, never come up, curl or tear. So, if you do this, make it a permanent fix.

That is exactly how I did this in my slide out: (As well as the 60 year old tongue-and-groove flooring planks in my house too. I did not bother smoothing them out, I just spread Vinyl floor tile glue on the planks and laid down the tiles.

 

[johnc3211]

I am reusing the original vinyl flooring. I cut it around the walls so I could lay it back to repair. I know from painful experience that if you glue down economy sheet vinyl that when the glue dries it sucks the flooring down to the plywood and shows any imperfections. The vinyl in my camper seems thin. I don't plan to glue it down at all, just staple it around the edges and put trim over the staples. My main worry is the new plywood is not exactly the same thickness as the old plywood. I have found a couple of ready to use products that claim to be flexible when dry and somewhat sandable.