Same for all interior doors but especially bathroom & laundry doors. Most modern doors around here are crap so easily damaged by a bit of moisture.Detail. On exterior doors, if I trim them, I like to add a couple of coats of outdoor paint to the bottom edge so it's less likely to soak up water when it rains. I had to repair a church door that was in a low spot so water soaked the bottom and made it swell. Hard to close properly, a chore to fix.