One layer 1″x24″ ToughRock® Shaftliner or DensGlass® Shaftliner panels between 2-1/2″ floor and ceiling J runners with T section of 2-1/2″ steel C-T studs between panels.
Opposite side: Base layer 5/8″ (15.9 mm) ToughRock® Fireguard C® gypsum board or 5/8″ (15.9 mm) DensArmor Plus® Fireguard C® gypsum panels applied at right angles to studs with 1″ Type S screws 24″ o.c. Second layer 5/8″ (15.9 mm) ToughRock® Fireguard C® gypsum board or 5/8″ (15.9 mm) DensArmor Plus® Fireguard C® gypsum panels applied at right angles to studs with 1-5/8″ Type S screws 16″ o.c. at studs and 1-1/2″ Type G screws 16″ o.c. placed 2″ back on either side of vertical joints. Face layer 5/8″ (15.9 mm) ToughRock® Fireguard C® gypsum board or 5/8″ (15.9 mm) DensArmor Plus® Fireguard C® gypsum panels applied parallel to studs with 2-1/4″ Type S screws 12″ o.c. at studs and 1-1/2″ Type G screws 12″ o.c. placed 2″ back on either side of horizontal joints. (NLB) Sound tested with 1-1/2″ glass fiber insulation friction fit in stud space.
