If the mold cannot be cleaned (if growth is on gypsum board then removal and replacement is recommended), then the affected area should be removed and replaced. Also, the source of moisture must be identified and corrected or the potential for reoccurrence of mold growth is very high. Precautions should be taken during the removal and cleaning of the effected area to minimize the exposure to the mold and the spread of spores (HEPA filter respirator, gloves and HEPA filter vacuum). An appropriate resource should be consulted to ensure that proper steps are taken, CertainTeed personnel are not qualified to consult in this area.