CT-Stud Horizontal Spans

for interior corridor ceilings and stairway soffits

PDF of ClarkDietrich Shaftwall Horizontal Spans
(18ga only available in select markets)

2 Hour Wall with (2) layers 1/2" Type C + (1) 1" Shaft Liner

Member Gauge L/120 L/180 L/240 L/360
2-1/2" 25ga 8'-8" 8'-8" 8'-6" 7'-5"
20ga 10'-6" 10'-6" 9'-10" 8'-7"
 
4" 25ga 11'-8" 11'-8" 11'-8" 10'-8"
20ga 14'-3" 14'-3" 14'-1" 12'-4"
18ga 19'-1" 16'-8" 15'-2" 13'-3"
 
6" 20ga 18'-9" 18'-9" 18'-9" 16'-10"
18ga 22'-9" 22'-9" 20'-9" 18'-2"
 

2 Hour Wall with (2) layers 5/8" Type X + (1) 1" Shaft Liner

Member Gauge L/120 L/180 L/240 L/360
2-1/2" 25ga 8'-2" 8'-2" 8'-2" 7'-2"
20ga 9'-11" 9'-11" 9'-6" 8'-3"
 
4" 25ga 11'-0" 11'-0" 11'-0" 10'-3"
20ga 13'-6" 13'-6" 13'-6" 11'-10"
18ga 18'-5" 16'-1" 14'-7" 12'-9"
 
6" 20ga 17'-9" 17'-9" 17'-9" 16'-3"
18ga 20'-5" 20'-5" 20'-0" 17'-6"