One layer 1″ x 24″ (25.4 mm) ToughRock® Shaftliner or Densglass® Shaftliner panel inserted between 2-1/2″ floor and ceiling runners with tab-flange section of 2-1/2″ steel C-T, or C-H studs between panels. One layer of 5/8″ (15.9 mm) ToughRock® Fireguard X® Products or 2/8″ (15.9 mm) DensArmor Plus® Fireguard® gypsum panels installed vertically on each side with 1″ Type S screws 12″ o.c. (NLB). Sound tested with 1-1/2″ glass fiber insulation friction fit in stud space.
Hourly Rating: 2-hour
STC Rating: 50-54 STC
Fire Test Reference: UL V473, ULC W481, cUL V473, GA WP 70592