§ 150.047 HEADERS FOR USUAL LOADING CONSTRUCTION.
 
Maximum Span
Two 2 x 4s on edge
3 ft. - 6 in.
Two 2 x 6s on edge
4 ft. - 6 in.
Two 2 x 8s on edge
6 ft. - 0 in.
Two 2 x 10s on edge
7 ft. - 6 in.
 
(1992 Code, § 7-39)