At Fi-Foil, we get a lot of questions about advanced reflective insulation technology and how our products work to improve air space for better building performance. One product that gets a particularly large number of questions is our FSK Shield™, a Class A insulation facing and vapor retarder with low-emittance properties.

FSK Shield™ is an affordable facing made of aluminum foil bonded to natural kraft paper. The product includes a flame-retardant adhesive and is reinforced with a tri-directional fiberglass scrim. FSK Shield™ is available in 1000 sq ft rolls, each 54 inches wide.

Here are the top three questions and their answers

Q. Why Should I Use FSK Shield™ vs- a Foil-Faced Batt?

A. Cost savings and more flexibility for the contractor. FSK Shield™ can be used with unfaced batts, eliminating the need to special order for jobs requiring foil-faced batts. This reduces the number of seams that need to be taped on ceiling or wall applications.

Q. What are the Functions of FSK Shield™?

A. FSK Shield™ is an effective vapor retarder, especially when seams are properly sealed with Fi-Foil FSK tape. The low-emittance (low-e) foil facing reduces radiant heat transfer and can also be used to improve flame spread.

Q. How does FSK Shield™ Block Heat Transfer?

A. The aluminum low-e surface reduces radiant heat transfer by 97% for plenums and other open spaces in the building envelope. So, no matter where your building is located across the country, the result means a warmer space during the winter and a cooler space during the summer. When properly installed, FSK Shield™ can have a dramatically positive impact on overall building comfort and energy efficiency.

To learn more about FSK Shield and other advanced insulation products and systems, visit or contact us today at 800.448.3401.

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