foilfaced

Foilfaced describes insulation products that have aluminum foil as a facing on one or both sides of a core material. The foil provides reflective and barrier properties, making foilfaced assemblies common as radiant barriers and moisture/vapor barriers in buildings.

Common cores include polystyrene foam, polyiso or polyurethane foam, and mineral wool. The foil is bonded to the core by adhesive or lamination, creating panels, boards, or flexible sheets used in roofs, walls, and ductwork.

Properties and performance: The aluminum foil has a very low emissivity, typically around 0.03–0.05, giving a reflective radiant barrier that reduces heat transfer from roof surfaces to attic spaces. It also serves as a vapor barrier in many assemblies. Joint sealing with foil tape is essential to maintain barrier integrity; punctured foil or torn seams can reduce performance and may promote moisture accumulation.

Applications and installation: Foilfaced insulation is used in attic radiant barriers, wall insulation assemblies, and insulated panels. Installation considerations include keeping the foil facing clean and undamaged, taping joints and edges, avoiding excessive compression of the core, and ensuring compatibility with building codes and manufacturer instructions.

Standards and considerations: Foilfaced insulation must comply with relevant codes and standards for fire ratings, vapor barrier requirements, and labeling. Emissivity values and reflected heat performance depend on product design, installation, and climate; consult product datasheets for specific guidance.