I am hoping someone will be able to give me advice on how to proceed with my project. I am installing vinyl flooring and noticed the particle subfloor was rotten in a spot. I decided that I wanted to remove it and replace it with plywood. When ripping it up it looks like it was screwed and glued onto risers (planks of wood - not sure what they're called).
Is it best for me to take these risers up and just place 3/4" plywood on top of the existing plywood? I assume I would have to glue as well right? Or should I get 1/4" plywood and lay that on top of the risers?
Any advice you could provide would be greatly appreciated as I clearly have no idea what I am doing. Here is a picture of what it looks like:
Wider view of what's being replaced (don't mind the mess :))
Thanks in advance!