My house smells like a barn. Not the poopy cow kind of smell, but the damp wood kind of smell. A month or so ago I had a main line clog that backed up the bathtubs and luckily seemed to only spill fresh(er) water. The really weird thing is that none of the bathroom tile floors got wet. Whatever happened flowed underneath the tile and to the perimeter floors. It wasn't a lot, so the carpet only got wet for about the first foot, but I'm wondering if something happened under the Pergo just outside the guest bath. When the water dispenser leaked in the kitchen, it swelled and curled the edges of the flooring, but nothing is happening in this spot. I hesitate trying to peek under it in case I can't lay it back down and it's not the problem. I don't even know what kind of sub floor is under ther, if any. I also wondered if it's a creature in the walls because there are two air return vents in the same area, but I recently replaced all of those and it doesn't look like anything has ever tried to live in there (although I found a very old, un-nibbled mouse bait). Suggestions are very welcome.