Plastic on floor layers must extend _______ inches up the wall as a minimum

• A. 12 inches
• B. 6 inches
• C. 8 inches
• D. 18 inches

Answer: (A)

In containment work, creating a solid boundary between the work area and the rest of the building is essential. Extending the floor plastic up the wall provides a continuous seal that helps keep dust and debris from escaping through gaps at the perimeter, especially where the plastic meets the wall and around doorways. The minimum height chosen here is twelve inches because this height gives enough overlap for secure taping and reduces the chance of leaks or drafts pulling the edges away. It also supports maintaining the containment under negative pressure. Heights lower than twelve inches can leave gaps that dust can migrate through, while heights much higher than necessary add material and setup effort without extra containment benefit.