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Types of Plaster Metal Lath

This article explains lath-based plaster systems for building interiors.


Plaster metal lath is used to prevent or decrease wall crackings is either pumped or trowel application. Mesh metal lath used as support for plaster lath in ceilings and walls; this material is also used in building facades to support plaster finishes.

Metal lath is also sometimes used to support poured concrete ceilings (shown here) - unlikely to provide sufficient strength for thick pours unless additional reinforcement is used.

Depending on the age of the building, we may find a mixture of several types of plaster supports, wood lath, gypsum board lath, and metal lath. Wall or ceiling or plaster crack patterns may be present along the borders of metal lath segments, especially if the lath is not securely nailed in place.

Metal lath for plaster systems is divided into four groups with different properties for different applications.

Plaster Metal Lath

Plaster Metal Lath

1. Expanded metal lath

Diamond mesh gypsum lath made from metal sheets cut in a diamond pattern and drawn into an expanded shape.Modern diamond mesh lath is sold in a variety of metals, including galvanized, stainless steel, treated to ASTM 653, and in a variety of pre-formed shapes, including

 

  • Flat diamond mesh slats

Diamond mesh lath is used for exterior stucco and stonework on the exterior sheathing and as a plaster base for masonry walls

  • Corrugated Diamond Lath

  • V-Groove Diamond Mesh Lath - According to the current revision of ASTM C1063, metal lath applied to solid substrates must have a ¼" self-furred feature built into the lath panel. (AMICO 2019)

  • Paper-backed metal lath for factory applications (galvanized)


2. Extended rib lath 

Extended rib lath is similar to diamond mesh but with added reinforcing ribs. Lath is used to install stone and tile on walls or plaster on interior ceilings. The heavier ribbed slats allow for installation spans of 19" oc instead of the standard 16" oc.

Ribbed slats are currently sold as 1/8" flat ribbed slats and 3/8 high ribbed slats for ceilings and soffits per ASTM C1063.

3. Wire lath 

Wire lath (braided or welded wire - also known as "chicken wire")

Plaster Metal Lath

 Plaster Metal Lath

4. Slats 

Slats(popular early in the history of metal lathe use and often used in commercial projects when shot or gun-applied mortar or cement grout became common)

5. Spray-on slats

Spray-applied slats were used primarily on the West Coast [of the United States] where the mortar was sprayed onto the surface of the slats to increase the thickness of the mortar.

Kraft paper is used at the factory to prevent overspray of the mortar. The space between the kraft strips allows the paper to be visually aligned so that the ribs can be mechanically attached to the substrate.

Ribbed strips are typically attached directly to vertical framing members and do not include solid board substrates.

We supply sheet metal lath in two types: diamond metal lath and rib metal lath

Any inquiries please contact our sales department, email us sales@rt-ringmesh.com. Ordering any metal mesh products from us, you will get high quality material, and it will last long and reliably.


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