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Title: Section 2505  •  Size: 6060

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SECTION 2505 - INTERIOR LATH

2505.1 General. Gypsum lath shall not be installed until weather protection for the installation is provided. Where wood-frame walls and partitions are covered on the interior with cement plaster or tile of similar material and are subject to water splash, the framing shall be protected with an approved moisture barrier.

Showers and public toilet walls shall conform to Section 807.1.

2505.2 Application of Gypsum Lath. The thickness, spacing of supports and the method of attachment of gypsum lath shall be as set forth in Tables 25-B and 25-C. Approved wire and sheet metal attachment clips may be used.

Gypsum lath shall be applied with the long dimension perpendicular to supports and with end joints staggered in successive courses. End joints may occur on one support when stripping is applied the full length of the joints.

Where electrical radiant heat cables are installed on ceilings, the stripping, if conductive, may be omitted a distance not to exceed 12 inches (305 mm) from the walls.

Where lath edges are not in moderate contact and have joint gaps exceeding 3/8 inch (10 mm), the joint gaps shall be covered with stripping or cornerite. Stripping or cornerite may be omitted when the entire surface is reinforced with not less than 1-inch (25.4 mm) 0.035 inch (0.89 mm) (No. 20 B.W. gage) woven wire. When lath is secured to horizontal or vertical supports not used as structural diaphragms, end joints may occur between supports when lath ends are secured together with approved fasteners. Vertical assemblies also shall conform with Section 1610.2.

Cornerite shall be installed so as to retain position during plastering at all internal corners. Cornerite may be omitted when plaster is not continuous from one plane to an adjacent plane.

2505.3 Application of Metal Plaster Bases. The type and weight of metal lath, and the gage and spacing of wire in welded or woven lath, the spacing of supports, and the methods of attachment to wood supports shall be as set forth in Tables 25-B and 25-C.

Metal lath shall be attached to metal supports with not less than 0.049 inch (1.2 mm) (No. 18 B.W. gage) tie wire spaced not more than 6 inches (152 mm) apart or with approved equivalent attachments.

Metal lath or wire fabric lath shall be applied with the long dimension of the sheets perpendicular to supports.

Metal lath shall be lapped not less than 1/2 inch (13 mm) at sides and 1 inch (25.4 mm) at ends. Wire fabric lath shall be lapped not less than one mesh at sides and ends, but not less than 1 inch (25.4 mm). Rib metal lath with edge ribs greater than 1/8 inch (3 mm) shall be lapped at sides by nesting outside ribs. When edge ribs are 1/8 inch (3 mm) or less, rib metal lath may be lapped 1/2 inch (13 mm) at sides, or outside ribs may be nested. Where end laps of sheets do not occur over supports, they shall be securely tied together with not less than 0.049 inch (1.2 mm) (No. 18 B.W. gage) wire.

Cornerite shall be installed in all internal corners to retain position during plastering. Cornerite may be omitted when lath is continuous or when plaster is not continuous from one plane to an adjacent plane.

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