Installing Kitchen Exhaust I Smell Mold Occasionally In One 2nd Fl Bedroom. Got New Roof, Will The Smell Eventually Go Away?

I smell mold occasionally in one 2nd fl bedroom. Got new roof, will the smell eventually go away? - installing kitchen exhaust

In my Father's house brick shit mixed 1960th They ripped all the carpets are cleaned and painted. When setting wallpaper (40yrs old) found patches of mold. Some areas of the collapse of the ceiling plaster. Festivals and painted. We have a new roof last month and installed two roof air / ceiling fans (one for heat and one) for moisture. There is an occasional smell of mold in the bedroom of my daughters, actually the opposite of the one, so that in fact inside the house. I can not really say where it comes from, but most often on one side of the room. The bedroom is located between the other two. Not near a bathroom, not the kitchen. The smell is not always available. If there is a problem, water, and the new fixed roof, the shape disappear by itself?