Johns Manville Formaldehyde-free™ FSK-25 thermal and acoustical fiberglass insulation is available in R-Values up to R-38 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.
R-Values: R-11, R-13, R-19, R-30, R-38
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FSK 25 TDS
FSK 25 SDS