R11 3-1/2 x 23 x 70' KF INSUL 135.13 SQ. FT. ROLL, was #910085 & 980085 | R-11 Fiberglass Kraft Faced Roll
3-1/2" x 23" x 70'-6"
135.13-Sq. Ft. per bundle
"R'' stands for resistance to heat flow. The higher the R-value the greater the insulating power.