Large commercial buildings that have a mold issue sometimes need large containment built.When a large building area (more than 30 sq.ft. of contiguous moldy material) is to be cleaned, use of negative air and dust containment are appropriate. Our SERVPRO of Ocala Crew photo shows use of strong 2x4 wood construction frames to support a 6-mil poly dust barrier giving a passage through a building into the mold cleanup area. It is important that the mold contractor protect workers performing remediation using appropriate masks, clothing, etc. Do not take down the mold demolition dust containment barrier before the building has successfully passed a mold remediation clearance inspection and test. If the cleanup was not complete, properly performed, and successful, early dust barrier removal risks cross-contamination into other building areas.