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.
Note: Color of product may differ based on the manufacturing location.
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.
|ASTM Standards||ASTM C665||Type III, Class A, Category I|
|Flame Spread||ASTM E84||≤ 25|
|Smoke Development||ASTM E84||≤ 50|
|Water Vapor Permeance Facing||ASTM E96||0.05 Perms (3 ng/Pa-s-m2)|
|Water Vapor Sorption||ASTM C1104||5% or less by weight|
|Odor Emission||ASTM C1304||Pass|
|Fungi Resistance||ASTM C1388||Pass|
|VOC Emissions||ASTM ES Section 011350||Pass|