Sheet Metal Lath for Stucco and Plaster Reinforcing

Sheet Metal Lath – Diamond Metal Lath and Rib Metal Lath

Stucco, plaster and veneer would easily crack under types of stress and deflation in the process of building construction and residential living. Metal lath is used to prevent or decrease wall crackings in either pumped or troweled application. Sheet metal lath is slit and expanded into small diamond openings (approximately 11,000 per square yard).

We supplysheet metal lathin two types: diamond metal lath and rib meta lath. Flat diamond metal lath is nor used over solid surface like gypsum, concrete and wood sheathing. Because flat sheet will only cause the stucco to bond only to the sheathing and not complete the embedding process. Therefore expanded metal mesh is usually self-furred: dimpled and V-grooved. Diamond metal lath, for its unravel feature, is especially suitable for high strength needed architectures. Rib metal lath is expanded metal made sheet with ribs to increase the strength of it overall structure. Strip lath and corner lath are also available for installation convenience.

Diamond Metal Lath

Flat diamond metal lath could only bond to the sheathing but not complete the embedding process for covering a solid surface like gypsum, concrete and wood sheathing. Therefore self-furring metal lath came into being. Self-furred diamond metal lath is generally used as reinforcement of plaster for solid surface. And it is divided into two types: dimpled and V-grooved. The two kinds of diamond metal lath is showed below in DML-01 and DML-02.

Specification

• Material (conforming to ASTM A653/A653M):
  • G60 hot-dipped galvanized steel, G90 is available upon special request;
  • G60 cold-rolled galvanized steel;
  • Zinc alloy and vinyl coated.
• Weights (per sq. yd.):
  • 1.75 lbs./sq. yd.;
  • 2.5 lbs./sq. yd.;
  • 3.4 lbs./sq. yd.
• Mesh size:5/16" × 9/16", 6/16" (8.3 mm) × 3/4" (17.7 mm).
• Thickness:
  • Standard diamond metal lath: 1/8".
  • Depth of dimples and grooves: 1/4".
  • Overall depth of the lath: 5/16" (7.9 mm).
• Sheet size:27" × 96".
• Number of grooves per sheet:5.
• Weights per bundle:
  • 35 lbs./bdl (for 1.75 lbs./sq. yd.);
  • 50 lbs./bdl (for 2.5 lbs./sq. yd.);
  • 68 lbs./bdl (for 3.4 lbs./sq. yd.).
• Packaging:10 sheet (20 sq.yds) per bundle, 50 bundles/lift.

Application:

• Dimpled and v-grooved diamond metal lath is generally used in applications over solid surfaces such as gypsum, concrete and wood sheathing block.
• 5/16" × 9/16" for common interior plastering, 3/8" × 3/4" for stucco work or as a support for loose fill rock wool or similar insulation.
• 1.75 lbs./sq. yd. lath is not recommended for open frame use other than in tested proprietary one coat systems.

Rib Metal Lath

Rib lath is the most rigid for all sheet metal laths for its ribs running the whole length of the sheet added additional strength. Rib metal lath is commonly used for soffits and ceilings. Two types of rib metal lath are supplied: Hi-rib lath and flat rib lath, among which the most popular type is 3/8" high rib and 3.4 lbs./sq. yd.

Flat-Rib:1/8" for all ribs on the lath, spaced at 3" on-center. The 3" wider space is provided for wooden or metal supports. This lath is ideal for machine applied plaster, backed with 2 strips of backing papers.

Hi-Rib Lath:1/8" rib between two 3/8" ribs, spaced 4" every pairs of 3/8" ribs. Hi-Rib lath is used primarily in horizontal applications or for framing spaced no more than 24" on center. Strips of 3" backing paper should be attached to the spaces between the 3/8" ribs in order to minimize blow through of plaster when machine applied as showed below in pictureSML-09.This lath should be installed horizontally on vertical walls or ceilings.

Specification

• Material (conforming to ASTM A653/A653M):
  • Hot-dipped galvanized carbon steel;
  • Zinc alloy and vinyl coated.
• Weights (per sq. yd.):
  • 1.75 lbs./sq. yd.;
  • 2.5 lbs./sq. yd.;
  • 3.4 lbs./sq. yd.
• Mesh size:12.7 mm × 7.1 mm.
• Sheet size:
  • 27" × 96" for 1/8" & 3/8" ribs;
  • 29" wide, 5', 10', 12' length for 3/4" rib.
• Weights per bundle:
  • 35 lbs./bdl (for 1.75 lbs./sq. yd.);
  • 50 lbs./bdl (for 2.5 lbs./sq. yd.);
  • 68 lbs./bdl (for 3.4 lbs./sq. yd.).
• Packaging:10 sheet (20 sq.yds) per bundle, 50 bundles per lift.

Application

Made of expanded metal, rib lath is the ideal material as a background for plaster, render, stucco application in construction of suspended ceilings partition.

Strip lath and corner lath

Strip lathis expanded diamond metal lath formed into strips with smooth edge and used for reinforcing joints of solid based. It is normally attached diagonally at the corner of all openings as doors, windows or areas prone to crack for reinforcement. It may also be used to span pipe chases or reinforce other stress points such as the corners of openings in the stucco membrane within the lath system.

Specification:

Roll size:

• Short rolls:4" × 8', 6" × 8';
• Long rolls:
  • 2.5" - (20 m × 65 mm)
  • 4.5" - (20 m × 115 mm)
  • 7" - (20 m × 175 mm)
  • 9" - (20 m × 225 mm)
  • 12" - (20 m × 300 mm)

Packaging:

• 75 pcs/ctn., 600' ft/ctn., 39 lbs./pallet for 4" × 8';
• 75 pcs/ctn., 600' ft/ctn., 60 lbs./pallet for 6" × 8'.

Corner lathcame into being by strip lath bent into obtuse angle with smooth edges. It is used in where intersections happens—wall meet walls or ceilings and ground.

Table 1: Specification of corner lath

Design	Flange width	Length	Pieces per carton	Feet per carton	Galvanized weight per 1000 lineal. feet
CL-01	2"	96"	75	600	84 lbs.
CL-02	3"	96"	75	600	118 lbs.
CL-03	2"	48"	125	500	84 lbs.

Feature

• Cracking resistance
• Fire-resistance

Application

• Can be used for exterior and interior walls, ceilings, floor constructions as well as ornaments designs in other applications.
• Ideal for gypsum, concrete, wood based sheathing.
• For veneer plaster, render, stucco material reinforcement.

Accessories:

• Backing barrier:kraft paper and asphalt paper.
• Other accessories:expanded corner bead, expansion joints, soffit vent, foundation screed.

Installation

Metal lath products that include the water resistant barrier, shall be installed horizontally on vertical walls with the upper layer lapped over the lower layer not less than 2 inches and vertical joints overlapped no less than 2 inches.

Where paper-backed metal lath is applied over wood based sheathing for cement plaster (stucco) reinforcement, an additional layer of Grade D paper shall be installed on the sheathing.

Codes and standards

• Manufacture: ASTM C-847.
• Zinc-coated (galvanized): ASTM A641/A641M.
• Backing paper: Federal Specification UU-B-790.

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