DH and I are in the process of trying to prep the kitchen for 5/16" hardwood floor installation. Floor guy recommended taking up both layers of peel and stick tile to the subfloor. We are able to get the first layer up fairly easily, but the second is really glued down to the plywood subfloor and is not coming up cleanly at all-and we have tried everything–iron/hot water soak, etc. (peeling up pieces of plywood with it and just a general sticky gluey mess. Also, original plywood subfloor is solidly screwed down, so removing that in addition is pretty much out of the question)
Are we committing a cardinal sin by laying a 1/4" plywood layer on top of one layer of vinyl + plywood subfloor? Our house is over 100 years old, so creaky floors are somewhat a way of life. I just don't want the new floors to be damaged from the start.