Indoor Air sciences CSMI Practice Exam

The minimum ply for polyethylene sheeting used for isolation barriers, as specified in IICRC S520, is 4-mil. This standard emphasizes the importance of using materials that are durable enough to effectively contain contaminants and prevent the spread of water damage during restoration processes. A 4-mil thickness provides a balance between practicality and performance, ensuring that the material is robust enough to withstand handling while effectively serving its purpose as a barrier.

Using a thicker material than 4-mil may be suitable for certain applications where additional strength is required, but anything thinner, such as 2-mil, wouldn't provide adequate protection. The choice of 4-mil aligns with the industry standards, ensuring that restoration professionals can maintain a safe environment while effectively managing moisture and contamination challenges.