How to Build a Safe Mold Containment


Photo by Restoration Professionals

What Time Saving Techniques Do You Have For Mold Containments?

To start, allow 4-8’ beyond where the marked out mold removal is to stop. This is just in case the mold in the wall has grown beyond the moisture or where the inspector thought removal was efficient.  Where the edge of the containment goes, put down two layers of painter’s tape. Then place the edge of the 6 mil plastic on top of the tape. Then using duct tape, tape the plastic to the painters tape.

Set up a decontamination chamber with two zippers — one zipper at the entrance and one into the containment. Post a sign outside of the containment that states: MICROBIAL REMEDIATION KEEP OUT! Once the chamber is in place nobody is allowed to enter the containment unless they are in full personal protective equipment and are trained on how to enter and exit the containment properly.

Keep zippers closed. Zippers are to be closed as soon as technicians pass through the threshold of the zipper door. No two zippers are to be open at the same time.

Make Up Air Photo by Swift Restoration
Install Make Up Air Filter on the outside of your containment. This is completed by taping a HEPA replacement filter to the containment that allows air to flow from the outside of the containment into inside. Once the equipment is turned on, the containment will be under negative air pressure. If the containment is built correctly and air tight, it is time to add the make up air filter.  As shown in the photo above, the make up air filter is taped to the containment over a small opening in the containment.  If a make up air filter is not installed, when the equipment is turned on with the containment under negative air pressure, the pressure will cause the containment to collapse.

Turn off and close up all mechanical air such as heating, cooling, and ventilation in the mold area by closing and containing all vents. Cover all vents with 6 mil plastic and tape off with duct tape. This will keep dust or debris with mold spores from getting into the ducting system. If ductwork is not contained, the mold spores can spread through the mechanical system.

Pro Tip: If your containment covers up the return air duct that provides air to the rest of the building, you may have to build ducting from inside of the containment to the return air so the HVAC system can be operational during your mold remediation project. Also, if you suspect any duct work is being contaminated, the ducting should be cleaned as part of the remediation process.

Now that the containment is built, it is important to Enter and Exit The Mold Containment With Proper Protective Equipment

New York City Department of Health and Mental Hygiene November 2008

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