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Mold under vinyl floor

Posted: Sat Sep 28, 2019 11:46 pm
by Tropicalcats
I purchase a double wide that sat empty for about 4 years. All and all is was in pretty good shape considering. I know that I need under pinning done and with that said let me ask this.
I had a couple soft spots which I went over with 3/4 plywood as suggested by the contractor who did the work. Since we had not decided on a floor for that area I took a piece of vinyl flooring I had left from another room and just put it over the new subfloor. When I went to move it, it had mold underneath on the piece of vinyl and on the floor. What could cause that? Should I be concerned about the floor I already put down ?
I live in central floor so needless to say it was hot this summer but it’s cool in the house and not humid.