(A) Top plates shall be two 2 x 4s, and spliced at all corners.
(B) Floor joists:
Maximum Clean Span
| |
2 x 6 - 16 in. o.c. | 10 ft. - 2 in. |
2 x 8 - 16 in. o.c. | 13 ft. - 8 in. |
2 x 10 - 16 in. o.c. | 17 ft. - 3 in. |
2 x 12 - 16 in. o.c. | 20 ft. - 10 in. |
(C) Flat roof joist supporting finished ceiling - same as floor joist.
(D) Ceiling joists:
Limited Attic Storage - Maximum Span | No Attic Storage - Maximum Span | |
2 x 4 - 16 in. o.c. | 7 ft. - 4 in. | 10 ft. - 6 in. |
2 x 6 - 16 in. o.c. | 11 ft. - 2 in. | 16 ft. - 5 in. |
2 x 10 - 16 in. o.c. | 15 ft. - 2 in. | 21 ft. - 10 in. |
(1992 Code, § 7-40)