If you ever detect soft spots in your floor, it pays to investigate and find what is causing the problem…
In this case, we found a lot of mold and just plain grossness under the top layer of flooring! It was a very good thing that the house was vacant at the time, because the repairs were extensive.
The entire floor ended up being replaced, new decking was installed and new industrial tile was added
The finished product was not too bad, some of the glue oozed up as it was walked on because the very cold conditions did not allow it to dry for a while, but a little cleaning remedied that problem and it cured after a couple days.
Always check when there may be a problem!!