You all seem to agree on the same idea that I had except for the tiling. Not a problem as I like the thought of the vinyl flooring better. We had these cabinets made in 1977 by an old man who was locally renowned for his quality work. But, I learned that he used this JUNK (agree with cabinet maker here) in all his cabinets at that time. My wife's parents house has his cabinets that he put in about 2 years after he did ours. Both bottoms are off the floor, but over the years with a small leak here and a small leak there, (no car batteries, slug-gunner ) have caused buckling. So, it is just a matter of time before the crumbling begins. Actually, it has begun and I suppose I could put any amount of pressure downward and it would collapse.
Oldman, I appreciate all your details as you gave me the information that I was thinking that it needed framing underneath for support. One thing I'll do to fit the board underneath the sink is to drill the hole for the water supply, then cut out a small piece through those holes and put it in first. Then the remainder of the board will fit back to the first piece so that is is almost tight around the plumbing. The drain goes out the wall, so that is good. Will get started next week on tearing out the JUNK and investigating the support that is under it. If no support, will use pressure treated lumber to frame it, place the PT plywood and then the vinyl flooring over that sealing it all off with a vinyl caulk as I have some of that the needs to be used.
I appreciate all the reponses. I totally agree with cabinet maker. Quality is worthy of pursuit. Thanks, again, gentlemen. Good night.
the old swampgator in Florida