In an upstairs bathroom, I found these water trail stains on a wall.
There's no plumbing behind the wall so I imagine these are from humidity.
What I'm curious about is whether there's any way to prevent such stains from occurring. Is there a special type of paint, or a water-resistant drywall, that can prevent this?
Best Answer
As Kris said in a comment, the solution is to not let that much moisture accumulate. Run a well-performing bath fan every time you use the shower, even in the dead of winter. Vary run duration accordingly. In my part of the world this means 2-4 hours in summer and at least a quarter of an hour (after the shower ends) in winter.
As I often say, your bathroom isn't a bathtub. It shouldn't be expected to hold water, whether on the floor or the walls.