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Title: Section 2504  •  Size: 4079

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SECTION 2504 - HORIZONTAL ASSEMBLIES

2504.1 General. In addition to the requirements of this section, supports for horizontal assemblies of plaster or gypsum board shall be designed to support all loads as specified in Chapter 16 of this code.

EXCEPTION: Wood-framed assemblies meeting the requirements of Section 2326 need not be designed.

2504.2 Wood Framing. Wood stripping or suspended wood systems, where used, shall not be less than 2 inches (51 mm) nominal thickness in the least dimension, except that furring strips not less than 1-inch by 2-inch (25 mm by 51 mm) nominal dimension may be used over solid backing.

2504.3 Hangers. Hangers for suspended ceilings shall not be less than the sizes set forth in Table 25-A, fastened to or embedded in the structural framing, masonry or concrete.

Hangers shall be saddle-tied around main runners to develop the full strength of the hangers. Lower ends of flat hangers shall be bolted with 3/8-inch (9.5 mm) bolts to runner channels or bent tightly around runners and bolted to the main part of the hanger.

2504.4 Runners and Furring. The main runner and cross-furring shall not be less than the sizes set forth in Table 25-A, except that other steel sections of equivalent strength may be substituted for those set forth in this table. Cross-furring shall be securely attached to the main runner by saddle-tying with not less than one strand of 0.051 inch (1.30 mm) (No. 16 A.W. gage) or two strands of 0.040 inch (1.02 mm) (No. 18 A.W. gage) tie wire or approved equivalent attachments.

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