turns out the room i was staying in for a year DID have mold under the floorboards

[kathisterima]

Maybe there is some waterproofing or insolation surface that blocks the movement and causes liquefaction of vapor water, which is the most common cause of mold growth. If the timber is moldy then the entire floor needs to be replaced. But you should look up the issue above because you are gonna have the same issue again.

Years ago I had mold in my ceiling above my bed for some inexplicable reason, and I found out around a year later that the guy above (crazy old man) had a flooded bathroom and the water was going through the floor into my apartment... and of course it grew mold..