We have an odor in our linen closet that smells like moisture, musty, etc.
Four months ago we replaced our tub with a new Kohler Villager cast iron bathtub. The installation is in a three-sided alcove with tile surround walls above the tub. Tub, tile and plumbing are new, but in same configuration as before. On the other side of the wall where the plumbing and drain are is a linen closet, with an access panel you can open and see the underside of the tub, the drain, and the valve. The closet has started smelling really musty in the last few weeks. There are no visible drips, moisture on the floor, leaks from drain or supply pipes. The only evident moisture is that when you touch the outside of the tub, (the cast iron part behind the access panel - not the finished part in the bathroom) it feels moist like there is condensate on it. It's all over the tub, not just near the drain and overflow. The house is a 45 year old one-story, central heat/air, unfinished attic. Is it normal to have condensate or moisture on the outside of the tub like that? Is it a problem? Any ideas what could be causing the musty smell in the linen closet? Bathroom is used by two teenagers who take really long showers, but there is an exhaust fan to remove moisture. Weather has gotten cooler in last few weeks, so we are not running AC as much as before, and don't need heat yet, so inside humidity is higher in general.