XPS boards are sometimes produced with a laminated facing to enhance performance for specific applications:
- Polyethylene (PE) Film: A simple plastic film that provides a vapor retarder and protects the foam during handling. Often used for packaging.
- Aluminum Foil Laminate: A reflective foil facing serves two main purposes:
- Radiant Barrier: Reflects radiant heat, significantly boosting the effective R-value in applications like attic spaces or behind radiators.
- Vapor Barrier: Provides an exceptional vapor barrier.
- Non-Woven Fabric/Scrim: Adds surface toughness for improved handling and provides a “key” for plaster or stucco finishes (Exterior Insulation and Finish Systems – EIFS).
- Bituminous Coating: Used in below-grade or roofing applications for additional waterproofing and compatibility with bituminous adhesives or membranes.
