What other materials can serve as vapor retarders besides Kraft paper?

Study for the NHIE Insulation and Ventilation Exam. Review content with flashcards and multiple-choice questions, each offering hints and explanations. Ensure you are prepared for the test!

Kraft paper is commonly used as a vapor retarder due to its ability to restrict the movement of moisture through walls and ceilings. However, other materials can also effectively serve this function. Aluminum foil is an excellent vapor retarder because it is impermeable to moisture, providing a significant barrier when installed properly. Plastic sheeting, often made from polyethylene, is another popular choice as it offers a high resistance to water vapor diffusion and is typically more flexible and easier to install than rigid materials.

Cardboard, glass, metal, rubber, wood, and cement do not generally function as effective vapor retarders as they either allow moisture to pass through or do not provide a continuous barrier. Thus, aluminum foil and plastic are widely recognized and used in insulation systems to manage moisture and prevent condensation-related issues within building assemblies. This characteristic makes them suitable alternatives to Kraft paper.

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