How Do You Prevent Cross-Contamination During Multi-Unit Mold?

The first step is to create a physical seal between the mold-affected unit and the rest of the building. Use heavy plastic sheeting and tape to cover doorways, windows, and HVAC vents. This stops mold spores from drifting into hallways or neighboring apartments.

Seal all gaps, including under doors and around electrical outlets. If the mold is in a shared wall, you may need to seal both sides. Check the seal daily for tears or gaps. A tight barrier is the foundation of any containment plan.

• Use 6-mil polyethylene sheeting for walls and doorways
• Tape all seams with duct tape or zip-wall tape
• Cover vents and return air grilles completely
• Seal gaps around pipes and conduits
• Inspect barriers before and after work each day

Always start work in the cleanest areas and move toward the mold source. This prevents dragging spores from a heavily contaminated spot to a cleaner one. For example, clean the hallway side of a wall before the moldy side.

Use separate tools, buckets, and rags for each unit if possible. If you must reuse equipment, clean it with a HEPA vacuum and a damp cloth before moving to the next unit. Change your shoes or use boot covers between units to avoid tracking spores.

After work in one unit, clean all tools and equipment before moving to the next. Wipe down hard surfaces with a damp cloth and a mild detergent. Use a HEPA vacuum on soft items like brushes and cloths. Never use a regular vacuum, as it can blow spores around.

Also clean the containment area itself, including the plastic sheeting and the floor. Dispose of the sheeting as contaminated waste. If you live in Tulsa, where humidity is high, keep windows closed during cleanup to avoid drawing in moist air that can feed mold.