I'm planning on removing the old sheet vinyl flooring in my small kitchen and installing a new floating vinyl floor (looking at using Allure from HomeDepot). I just started to rip up the old vinyl and have three questions: 1. Can I leave the old underlayment and reuse it for the new floating vinyl? 2. If yes, I know I will have to remove any adhesive residue, can I use the scraping method that's recommended for concrete floors? Or is there another residue-removing method for underlayment since it's wood? 3. Being that floating vinyl adheres to each other instead of the floor, are minor imperfections in the old underlayment ok? I think after scraping, a very thin layer of old adhesive may still remain (and also tiny dents/holes resulting from previous use), but can these issues be overlooked for floating vinyl as long as the old underlayment is level and in decent condition? I am really hoping that I won't have to install new underlayment as I'm not sure if I have the skills/tools required. So any advice or wisdom would be greatly appreciated! Thank you :)

I am heading towards the end of a two bedroom addition to my home. Where the new hallway is, the flooring that I am butting up against consists of a 1/4" luan, linoleum and then peel and stick tiles. I have found the same peel and stick vinyl tiles that are on the original flooring and 1/4" luan, but I am not sure what to do to make up the difference in height that is caused by the linleum. My first thought was to proceed with a .075" plastic underlayment, however, when I ordered this, it turned out to be a foam underlayment that is normally used for laminate flooring. Would this be an acceptable surface for my Peel and stick tiles? If so, how should I attach the foam underlayment to the luan, or just have it be somewhat floating while using the self adhesive strip on the outsides? If not, what are some other options that I could use in order to make a smooth transition from the old to new or elevate the height of the new tiles? One more note, I have already put down my luan and would rather not have to take it back up. Any thoughts?