Quick AnswerAttic mold is remediated by containing the space, removing or treating affected sheathing and insulation, HEPA filtering the air, and fixing the cause - usually a roof leak or blocked ventilation trapping warm, moist air. Improving attic ventilation and sealing air leaks from the living space below is what keeps it from returning.
Attic mold almost always points to a moisture problem overhead: a roof leak, missing or blocked soffit and ridge vents, or a bathroom fan venting into the attic instead of outside. Remediation that skips the cause is temporary.
On roof sheathing, light surface mold can sometimes be treated and encapsulated, but heavily affected wood may need replacement. The bigger fix is airflow - proper intake and exhaust ventilation keeps the attic dry through Kansas City winters and humid summers alike.
Related answers & services
Water damage in the Kansas City metro? Call (913) 213-3686 for a live 24/7 responder, or learn more about Kansas City mold remediation.