Home Blog

What is FSK insulation facing?

Posted on 05/01/2023

FSK Insulation Facing

FSK: Foil-scrim-kraft, Scrim=Yarn

FSK insulation facing, also known as Foil-Scrim-Kraft facing, is a type of insulation facing material commonly used in commercial and residential construction. Its typical using is as insulation material in HVAC (Heating, Ventilation, and Air Conditioning) systems. FSK Insulation facing is an outer surface of insulation materials, it is additional layer made of reinforced Aluminum foil or PP film. Foil-scrim-kraft insulation facing is an insulation product that is both a vapor barrier and a flame retardant.

FSK Insulation facing is laminated 5 layers of structure, the outer layer is Aluminum foil and Kraft paper. The middle layer is the Glass fiber layer double side coated with Flame-retardant adhesive, it increased tensile strength of FSK, and the Aluminum foil and Kraft paper are firmly bonded. It consists of three main components:

Foil: The outer layer is typically made of aluminum foil, which provides a reflective surface. This foil layer helps to reduce radiant heat transfer, improving the overall insulation efficiency. The aluminum foil layer effectively blocks moisture vapor from entering or leaving the building through the insulated wall or ceiling cavity. This is crucial for preventing condensation buildup and the associated problems like mold growth and structural damage.

Scrim: The middle layer is a reinforcing mesh or fabric, usually made of fiberglass. The scrim adds strength and durability to the facing, making it more resistant to tearing or puncturing.

Kraft: The inner layer is made of kraft paper, which provides additional structural support and serves as a vapor retarder. The kraft paper helps prevent moisture transmission through the insulation, preventing condensation and potential damage to the underlying materials. It also has flame-retardant properties, contributing to the overall fire safety of the insulation.

FSK insulation facing has a vapor barrier or a vapor retarder (the facing) that helps prevent moisture from moving from one space to another. The facing also helps protect the surface, hold the insulation together and fasten the material to building components. FSK insulation as a laminated insulation facing protects insulation materials as like as a jacket.

FSK insulation facing is commonly used to cover and protect insulation materials such as fiberglass or mineral wool batts, duct wrap, or rigid foam boards. It is often used in commercial and industrial applications to improve thermal performance, control moisture, and enhance fire resistance in HVAC systems.

Disadvantages of FSK Insulation Facing:

Not breathable: Can trap moisture within the wall cavity if not properly installed with adequate ventilation.

Requires careful handling: The foil layer can be easily damaged during installation.

Less effective in high-humidity environments: May not be ideal for certain locations or applications with very high humidity levels.

Need Aluminum Foil Tape?