If you smell mold, consider having a qualified mold inspection firm test for mold, locate the mold, determine the extent of the mold, determine the source of moisture and come up with a remediation plan.
How do you prevent mold?
Locate and fix water leaks immediately. Dry water from water leaks within 48 hours. Make sure clothes dryers are properly vented to the outside. Use exhaust fans when cooking, showering or using dishwasher. Insulate exterior walls to prevent condensation inside. Keep indoor humidity below 50 percent. Remember: Just cleaning up mold is not enough. You must find the water source and eliminate it.