FSK-25 is a flame-retardant vapor barrier facing made of lightweight aluminum foil, fiberglass reinforcing yarn, and natural kraft paper, adhered with a flame-retardant adhesive. It is designed to face fiberglass insulation in applications that require faced insulation to comply with ASTM E-84.

Johns Manville FSK-25 is a flame-retardant vapor barrier facing manufactured using 0.0003 lightweight aluminum foil, fiberglass reinforcing yarn and natural kraft paper laminated together with a flame-retardant adhesive. FSK-25 facing is designed for use over unfaced fiberglass insulation in applications that require faced insulation to comply with ASTM E-84 and is attached to the wall or ceiling with staples or mechanical fasteners.

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