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Title: Section 2320  •  Size: 9515

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SECTION 2320 - EXTERIOR WALL COVERINGS

2320.1 General. Exterior wood stud walls shall be covered on the outside with the materials and in the manner specified in this section or elsewhere in this code. Studs or sheathing shall be covered on the outside face with a weather-resistive barrier when required by Section 1402.1. Exterior wall coverings of the minimum thickness specified in this section are based on a maximum stud spacing of 16 inches (406 mm) unless otherwise specified.

2320.2 Siding. Solid wood siding shall have an average thickness of 3/8 inch (9.5 mm) unless placed over sheathing permitted by this code.

Siding patterns known as rustic, drop siding or shiplap shall have an average thickness in place of not less than 19/32 inch (15 mm) and shall have a minimum thickness of not less than 3/8 inch (9.5 mm). Bevel siding shall have a minimum thickness measured at the butt section of not less than 7/16 inch (11 mm) and a tip thickness of not less than 3/16 inch (4.8 mm). Siding of lesser dimensions may be used, provided such wall covering is placed over sheathing which conforms to the provisions specified elsewhere in this code.

All weatherboarding or siding shall be securely nailed to each stud with not less than one nail, or to solid 1-inch (25 mm) nominal wood sheathing or 15/32-inch (12 mm) wood structural panel sheathing or 1/2-inch (13 mm) particleboard sheathing with not less than one line of nails spaced not more than 24 inches (610 mm) on center in each piece of the weatherboarding or siding.

Wood board sidings applied horizontally, diagonally or vertically shall be fastened to studs, nailing strips or blocking set at a maximum 24 inches (610 mm) on center. Fasteners shall be nails or screws with a penetration of not less than 11/2 inches (38 mm) into studs, studs and wood sheathing combined, or blocking. Distance between such fastenings shall not exceed 24 inches (610 mm) for horizontally or vertically applied sidings and 32 inches (813 mm) for diagonally applied sidings.

2320.3 Plywood. When plywood is used for covering the exterior of outside walls, it shall be of the exterior type not less than 3/8 inch (9.5 mm) thick. Plywood panel siding shall be installed in accordance with Table 23-I-M-1. Unless applied over 1-inch (25 mm) wood sheathing or 15/32-inch (12 mm) wood structural panel sheathing or 1/2-inch (13 mm) particleboard sheathing, joints shall occur over framing members and shall be protected with a continuous wood batten, approved caulking, flashing, vertical or horizontal shiplaps; or joints shall be lapped horizontally or otherwise made waterproof.

2320.4 Shingles or Shakes. Wood shingles or shakes and asbestos cement shingles may be used for exterior wall covering, provided the frame of the structure is covered with building paper as specified in Section 1402.1. All shingles or shakes attached to sheathing other than wood sheathing shall be secured with approved corrosion-resistant fasteners or on furring strips attached to the studs. Wood shingles or shakes may be applied over fiberboard shingle backer and sheathing with annular grooved nails. The thickness of wood shingles or shakes between wood nailing boards shall not be less than 3/8 inch (9.5 mm). Wood shingles or shakes and asbestos shingles or siding may be nailed directly to approved fiberboard nailbase sheathing not less than 1/2-inch (13 mm) nominal thickness with annular grooved nails.

The weather exposure of wood shingle or shake siding used on exterior walls shall not exceed maximums set forth in Table 23-I-L.

2320.5 Particleboard. When particleboard is used for covering the exterior of outside walls it shall be of the Exterior Type 2-M grades conforming to U.B.C. Standard 23-4. Particleboard panel siding shall be installed in accordance with Table 23-I-M-2 and Table 23-I-Q. Panels shall be gapped 1/8 inch (3.2 mm) and nails shall be spaced not less than 3/8 inch (9.5 mm) from edges and ends of sheathing. Unless applied over 5/8-inch (16 mm) net wood sheathing or 1/2-inch (13 mm) plywood sheathing or 1/2-inch (13 mm) particleboard sheathing, joints shall occur over framing members and shall be covered with a continuous wood batt; or joints shall be lapped horizontally or otherwise made waterproof to the satisfaction of the building official. Particleboard shall be sealed and protected with exterior quality finishes.

2320.6 Hardboard. When hardboard siding is used for covering the outside of exterior walls, it shall conform to Table 23-I-O. Lap siding shall be installed horizontally and applied to sheathed or unsheathed walls. Corner bracing shall be installed in conformance with Section 2326.7. A weather-resistive barrier shall be installed under the lap siding as required by Section 1402.1.

Square-edged nongrooved panels and shiplap grooved or nongrooved siding shall be applied vertically to sheathed or unsheathed walls. Siding that is grooved shall not be less than 1/4 inch (6.4 mm) thick in the groove.

Nail size and spacing shall follow Table 23-I-O and shall penetrate framing 11/2 inches (38 mm). Lap siding shall overlap 1 inch (25 mm) minimum and be nailed through both courses and into framing members with nails located 1/2 inch (13 mm) from bottom of the overlapped course. Square-edged nongrooved panels shall be nailed 3/8 inch (9.5 mm) from the perimeter of the panel and intermediately into studs. Shiplap edge panel siding with 3/8-inch (9.5 mm) shiplap shall be nailed 3/8 inch (9.5 mm) from the edges on both sides of the shiplap. The 3/4-inch (19 mm) shiplap shall be nailed 3/8 inch (9.5 mm) from the edge and penetrate through both the overlap and underlap. Top and bottom edges of the panel shall be nailed 3/8 inch (9.5 mm) from the edge. Shiplap and lap siding shall not be force fit. Square-edged panels shall maintain a 1/16-inch (1.6 mm) gap at joints. All joints and edges of siding shall be over framing members, and shall be made resistant to weather penetration with battens, horizontal overlaps or shiplaps to the satisfaction of the building official. A 1/8-inch (3.2 mm) gap shall be provided around all openings.

2320.7 Nailing. All fasteners used for the attachment of siding shall be of a corrosion-resistant type.

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