Horrible smell in stairwells after rain...
We bought a house about seven months ago, and have noticed an awful smell that seems to increase after a rainfall. The smell is concentrated in the basement, but in the finished area, not the unfinished laundry room or crawl space. We finished the basement when we moved in.
It's also detectable in the three stairways (it's a split). The smell is somewhere between dead animal, rotten fish and just plain gross. At first I was sure it was some sort of dead critter, but since it has persisted for at least six months and is worst after rain, I figure it might have to do with moisture/mold something like that. Any suggestions or ideas would be much appreciated.