What material is often used to ensure effective sealing during fumigation?

Sealing films or tarps are specifically designed for fumigation purposes to effectively contain the fumigant within the area being treated. These materials have properties that not only provide a physical barrier but also minimize air exchange, which is crucial for maintaining the concentration of the fumigant at effective levels. The integrity of the seal is essential for ensuring that the fumigant penetrates and impacts pests as intended, while also preventing escapement into the surrounding environment.

Other materials, such as plastic sheets and cloth tarps, might offer some level of coverage; however, they may not provide the same level of impermeability and durability required for effective fumigation. Plywood boards may serve as structural barriers but do not provide the flexibility and tight sealing that comes from specialized sealing films or tarps. Therefore, using sealing films or tarps is the best practice for ensuring the effectiveness of fumigation operations.