Johns Manville Formaldehyde-free™ FSK-25 thermal and acoustical fiberglass insulation is available in R-Values up to R-30, and is offered in precut batts to fit standard wall cavities. FSK-25 faced batts combine fire resistance with excellent vapor resistance, and can be used in a wide variety of wood frame, engineered wood and steel frame construction applications, including new construction and retrofit. FSK-25 batts are designed with a foil facer that can be left exposed where codes permit.

Features

• Thermally Efficient: Effective resistance to heat transfer, with R-values up to R-30.
• Formaldehyde-free: Will not off-gas formaldehyde in the indoor environment.
• Sound Control: Reduces sound transmission through exterior and interior walls, floor and ceiling assemblies.
• Fire-Resistant: Flame Spread of 25 or less and Smoke Developed of 50 or less. Can be left exposed where building codes permit.
• Resilient Inorganic Glass: No rotting, mildew or deterioration. Also noncorrosive to pipes, wiring and metal studs.
• Superior Performance: Stable bonded glass fibers will not slump, settle or break down during normal applications.

144 sq ft