Containment
Definition
Containment is the plastic-sheeting barrier remediators build around a moldy area to keep spores and dust from spreading. EPA recommends limited containment for about 10 to 100 sq ft of mold and full containment above 100 sq ft.
What it means
Containment means sealing off the work area so mold and debris stay inside it. Crews use polyethylene sheeting, tape, zipper doors, and sealed vents and openings.
EPA’s guide for mold remediation describes two levels. Limited containment is generally recommended for areas of about 10 to 100 square feet, using a single layer of 6-mil fire-retardant plastic sheeting. Full containment is recommended for contaminated areas over 100 square feet, with double layers of sheeting and a decontamination chamber or airlock for entry and exit. Full containment must be kept under negative pressure with a negative air machine. The ANSI/IICRC S520 mold standard also covers containment design.
Why it matters to your home and your bill
Containment protects the rest of your home, so it should match the size of the job. A remediator who tears out moldy drywall with no barrier can spread spores into clean rooms and create a bigger cleanup. On the other hand, full containment for a tiny patch adds cost you may not need. Ask the company to explain which level it chose and why, and make sure it appears as a line item on the quote. Our mold remediation cost page shows what else belongs on an itemized estimate.
Sources
- Mold Remediation in Schools and Commercial Buildings Guide, Chapter 3, U.S. Environmental Protection Agency (April 29, 2026)
- ANSI/IICRC S520 Standard for Professional Mold Remediation, Institute of Inspection, Cleaning and Restoration Certification (accessed 2026-10-19)
- Mold Remediation Specialist (MRS), Institute of Inspection, Cleaning and Restoration Certification (accessed 2026-10-19)
Updated October 19, 2026. Drafted with AI assistance and edited by Vincent Wallace. All glossary terms