desperate for bsmt condensation advice!!
I have a one bedroom basement apartment with humidity problems and can't figure out what is causing it. It was vacant last summer (I've only had house under 2 years) and don't recall ever seeing moisture down there. Having said that I did build a patio and flower beds last spring.
The entire area has tiled flooring, but only the bedroom seems to get condensation, especially after a heavy rainfall. The bedroom and living room each have two exterior walls, the bathroom has one.
The house has central ac and I have tried running its fan 24/7 to dehumidify the air, but its not solving the problem. I also checked the sump pump which is working fine as well as the easetroughs, so I don't think its a leak. You can feel the humidity when you're in the room.
The adjoining washroom does not have an exhaust fan, so tenants open the windows for a few minutes to let the humidity out... they say showers are less than 10 minutes, door is closed during shower and window is immediately closed. The bath window has a plastic window well cover over it (its too hard to take off in summer because window wells not constructed properly) but there is some ventilation at the bottom of it.
I thought about installing a bathroom fan, but not sure it would solve the problem since the condensation is in the bedroom not the bathroom. I don't want to go through all that work and find out its still happening.
Is it possible that shower humidity would be problematic in an adjoining bedroom, but not the bathroom itself?
Why would the condensation problem be worse after a rainfall?
I'm really confused and unsure what to do next. Any advise would be greatly appreciated!