Our (parents) house is over 100 years, part with dirt floor, stone foundation and the like. It has a strong damp/musty smell. They are trying to run (portable) dehumidifiers but it's still close to 70% Does it look like (could be) mold issues in these pictures? https://www.flickr.com/photos/126695439@N04/ And what can be done practically (haven't been able to convince a new house ). Talking about spray foaming the foundation walls..would that be effective or worse?