Fire-Resistant Assemblies SA-100 - CGC

Screw Spacing and Location
Steel Stud Drywall Partitions
Hourly Test Face Layer Screw Base Layer Screw
Rating Number Length Type Spacing and Location Length Type Position Spacing and Location
1 hour U419 25 mm (1�) S 200 mm (8�) o.c. on panel edges;
300 mm (12�) o.c. in field of panel
U420 25 mm (1�) S 200 mm (8�) o.c. on panel edges;
300 mm (12�) o.c. in field of panel
U448 25 mm (1�) S 200 mm (8�) o.c. on panel edges;
300 mm (12�) o.c. in field of panel
U451 25 mm (1�) S 300 mm (12�) o.c.
2 hour U411 42 mm S 400 mm (16�) on edges and field; 25 mm (1�) S 400 mm (16�) o.c. on edges of panel;
(1-5/8�) 300 mm (12�) along runner 400 mm (16�) o.c. field of panel
U412 42 mm S 300 mm (12�) o.c. 25 mm (1�) S 610 mm (24�) o.c. on edges of panel;
(1-5/8�) 610 mm (24�) o.c. field of panel
U419 42 mm
(1-5/8�)
S 400 mm (16�) o.c. on edges and field 25 mm (1�) S 400 mm (16�) o.c. on edges and in field of panel
U420 42 mm S 200 mm (8�) o.c. on panel edges; 25 mm (1�) S 200 mm (8�) o.c. on panel edges;
(1-5/8�) 300 mm (12�) in field of panel 300 mm (12�) o.c. in field of panel
U453 42 mm
(1-5/8�)
S Channel side: 300 mm (12�) o.c. 25 mm (1�) S Channel side: 610 mm (24�) o.c.
25 mm (1�) S-12 Direct side: 300 mm (12�) o.c.
U454 42 mm
(1-5/8�)
S Channel side: 300 mm (12�) o.c. 25 mm (1�) S Channel side: 610 mm (24�) o.c.
42 mm
(1-5/8�)
S-12 Direct side: 300 mm (12�) o.c. 25 mm (1�) S-12 Direct side: 610 mm (24�) o.c.
U491 31 mm S 200 mm (8�) o.c. on panel edges;
(1-1/4�) 300 mm (12�) o.c. in field of panel
3 hour U419 56 mm
(2-1/4�)
S 300 mm (12�) o.c. on edge and field 25 mm (1�) S 1st layer 610 mm (24�) o.c.
38 mm G Between studs at horizontal joint 42 mm S 2nd layer 610 mm (24�) o.c.
(1-1/2�) (1-5/8�)
U435 56 mm S 300 mm (12�) o.c.; 50 mm (2�) from 25 mm (1�) S 1st layer 1200 mm (48�) o.c.; 100 mm (4�) from top
(2-1/4�) top and bottom of stud and bottom of stud
38 mm G Between studs at horizontal joint 42 mm S 2nd layer 1200 mm (48�) o.c.; 75 mm (3�) from top
(1-1/2�) (1-5/8�) and bottom of stud
U455 42 mm
(1-5/8�)
S Channel side: 300 mm (12�) o.c. 25 mm (1�) S Channel side: 610 mm (24�) o.c.
56 mm
(2-1/4�)
S-12 Direct side: 300 mm (12�) o.c. 25 mm (1�) S-12 1st layer Direct side: 610 mm (24�) o.c.
42 mm S-12 2nd layer Direct side: 610 mm (24�) o.c.
(1-5/8�)
4 hour U419 67 mm S 300 mm (12�) o.c. to studs 25 mm (1�) S 1st layer 610 mm (24�) o.c.
(2-5/8�)
38 mm G Between studs at horizontal joints 42 mm S 2nd layer 610 mm (24�) o.c.
(1-1/2�) (1-5/8�)
56 mm S 3rd layer 610 mm (24�) o.c.
(2-1/4�)
U435 67 mm S 300 mm (12�) o.c.; 50 mm (2�) from 25 mm (1�) S 1st layer 1200 mm (48�) o.c.; 125 mm (5�) from
(2-5/8�) top and bottom of stud top and bottom of stud
38 mm G Between studs at horizontal joints 42 mm S 2nd layer 1200 mm (48�) o.c.; 75 mm (3�) from
(1-1/2�) (1-5/8�) top and bottom of stud
56 mm 3rd layer 1200 mm (48�) o.c.; 75 mm (3�) from
(2-1/4�) top and bottom of stud
U490 56 mm S 300 mm (12�) o.c. to studs 31 mm S 610 mm (24�) o.c.
(2-1/4�) (1-1/4�)
38 mm G Between studs at horizontal joints
(1-1/2�)
60 CGC Fire-Resistant Assemblies