The old sheet vinyl is so old and brittle it's coming off the floor on its own (old house I bought). Underneath is plywood with dried stuff over most of it and I don't know what it is. I'm thinking of pulling up each piece of plywood (there are 5 pieces) and replacing them with new plywood of the same size. I could then use cut pieces as templates for pieces that need to be cut. I thought of this because I don't want to raise the level of the floor since it has already been raised almost 1 1/2 inches above the doorsill. Can anyone think why this wouldn't be a good idea?
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the "dried stuff" may be the old adhesive (lino paste) what you suggested should work, but thats a lot of work.if the old lino comes up easy . take a close look at the floor,is it possible the dried stuff is the felt (asbestos) backing.or is it adhesive,look for trowel marks.if you can scrape the old underlayment back to smooth, then use it again. you also say the floor has been raised 1 1/2 " there may be more than one layer of underlayment.now might be the time to pull up the old floors down to the sub-floor and start with new underlayment
p.s. be careful of sanding any floor that might have asbestos good luck
