I recently bought this 20 year old home that had a newer floor laid sometime later, maybe 5 to 15 years ago. From above It looks like peel and stick vinyl but it is not. One photo was taken by the water heater looking at the edge of the current floor. It looks like about a half inch thick composite wood with a tongue and groove type edge with the vinyl tile attached to the top. I am assuming this was a product sold a few ago to go over old floors and raise the level to match other floors like engineered wood floors. There also looks to be some sort of cushion type layer directly beneath. It appears to be a styrofoam bead sandwiched between clear plastic sheeting. So this leads me to believe this top floor is floating. Does anyone recognize this product? What is it? You can see from the one photo that the floor got wet and has raised the edges of this floor slightly. I want to lay another floor over this, preferably vinyl floor planks. If I have to remove this composite wood and vinyl floor first then I will have to add another layer of underlay to raise the height to match the other floors in the house. Is it possible to instead somehow sand this current level down to flat on these few raised edges? There are only a few that are raised in front of the refrigerator. The leak was minor and only affected a few seams. The remainder of the floor is in good shape.

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