Is this mold?
I just recently purchased my first home, and decided to embark on a renovation project to replace some the old carpet with engineered wood flooring. However, I seem to have hit a snag right away. As I pulled the carpet in the laundry room, I noticed this dark splotch on the osb underlayer. Specifically, I'm not sure if this is mold only, or if there is the beginning of some rot going on as well.. Can this area be treated, or do I actually need to remove and replace?
I'm unsure how to proceed and can use some experienced guidance from knowledgeable members of this board.