My first post as I am a new member and I hope someone can help me or steer me in the right direction. I noticed the stock wood flooring on my boat starting to deteriorate inside the cabin in what I would consider a fairly severe way and in a short period of time. it has started and is continuing to get substantially worse in the corner near the sliding glass door towards the stern. My first thought is that maybe it is coming from ocean salt mist while underway. I live in southern CA and often keep the sliding door to the stern open while cruising. Strange thing is, where it started was not near the opening of the door but rather in the corner under a stationary chair. Over a two month period, it has become larger (size of 2 bathroom throw rugs) and is turning black in color. First, it started out looking like someone had taken sandpaper and really gave it a good sanding turning lighter in color, now turning black in some places. One thought I had is maybe it was the generator which is located beneath the wood floor in the engine room. However, I have not used the generator for at least 4 weeks and it is continuing to grow in size. Has anyone ever heard of wood decaying like this in a fairly new boat while just sitting at the dock with he door closed almost all the time? Help?