7 Best Metal Laths for Supporting Wall Masonry Projects

Successfully anchoring stone veneer or stucco to an exterior wall requires a reliable mechanical bond that stands up to seasonal temperature shifts. Without a proper metal lath foundation, masonry will eventually crack, crumble, or pull away from the studs, leading to expensive repairs. Choosing the right material ensures that the facade stays secure through years of freeze-thaw cycles and daily household wear.

ClarkDietrich Diamond Mesh: The All-Around Choice

For standard residential wall projects, diamond mesh serves as the industry workhorse. This material features a consistent pattern of small, uniform openings that allow plaster and mortar to flow through and key securely to the surface. It is the go-to solution for homeowners tackling small-to-medium DIY masonry repairs or simple foundation patching.

Because of its straightforward design, it remains one of the most cost-effective options on the market. While it lacks the high-end reinforcement features of heavy-duty lath, it provides more than enough stability for standard stone veneer or thin-brick installations.

• Best for: Standard stucco and thin masonry veneer applications.
• Bottom line: A reliable, budget-friendly selection that gets the job done without overcomplicating the process.

Structa-Lath Twin Trac: Best for Stucco Work

If the objective is a high-performance stucco finish, Structa-Lath Twin Trac offers distinct advantages over traditional flat mesh. The twin-trac design features a welded wire construction that adds structural integrity while remaining lightweight and easy to handle. This product is engineered specifically to prevent the sagging often seen with cheaper, thinner metal sheets.

Installation is notably faster due to the product’s rigidity, which requires fewer fasteners to keep it flush against the wall. For homeowners managing their own exterior renovations, this reduces the time spent on scaffolding or ladders.

• Best for: Projects where structural stiffness and time-saving installation are priorities.
• Bottom line: A premium choice that justifies the higher cost through ease of use and long-term durability against cracking.

AMICO Self-Furring: For A Faster, Easier Job

Self-furring lath is designed with integrated “dimples” or “V-grooves” that hold the mesh away from the substrate. This small gap is crucial because it allows the mortar to flow behind the wire, fully encapsulating the metal and creating a solid, reinforced slab. Without this feature, the installer would have to manually add spacers, which often leads to inconsistent gaps and weak spots.

This product is ideal for those who prefer an all-in-one solution that eliminates extra steps. It works exceptionally well over solid surfaces like concrete block or existing masonry that needs a fresh face.

• Best for: Users who want to ensure a professional-grade mechanical bond without complex spacing techniques.
• Bottom line: Excellent for ensuring the mortar reaches the necessary depth to keep heavy stone or stucco firmly anchored.

Gibraltar G-Rib Lath: For Extra Heavy Support

When the project involves heavy stone veneer or thicker mortar beds, standard diamond mesh may not offer enough support. The G-Rib lath features raised longitudinal ribs that act as structural beams, preventing the mesh from buckling under the weight of the masonry. It provides a rigid backer that resists compression during the troweling process.

This is the preferred choice for homeowners working on tall walls or heavy exterior chimney stacks. While it is more expensive than standard mesh, the added rigidity is essential for preventing the mortar from sagging before it cures.

• Best for: Heavy-duty applications where structural support is more important than material cost.
• Bottom line: When the masonry is heavy, prioritize this rib-reinforced option to avoid sagging and surface failure.

Master-Grade Paper-Backed: Added Moisture Barrier

Moisture intrusion is the greatest enemy of any masonry project, as trapped water can rust the lath and degrade the wall behind it. Paper-backed lath combines the metal mesh with a factory-applied asphalt-impregnated paper. This creates a secondary weather-resistant barrier that protects the building’s structural sheathing.

This is a smart choice for exterior projects in regions with high humidity or heavy rainfall. It effectively replaces the need to install a separate layer of building paper, effectively streamlining the workflow while adding a necessary layer of protection.

• Best for: Exterior walls in wet climates where moisture management is a high priority.
• Bottom line: The added protection against water damage is well worth the slight premium over non-backed lath products.

Grip-Rite Expanded Lath: A Trusted, Reliable Pick

Grip-Rite is a household name for a reason, as its expanded metal lath is widely available and consistently manufactured to industry standards. It provides a clean, predictable grid that works well with most standard troweling tools. Many contractors rely on this product because it is easy to cut with tin snips and shapes well to corners.

For a homeowner who needs to pick up supplies at a local hardware store, this is a readily accessible choice. It doesn’t feature advanced innovations, but it functions exactly as expected for a wide range of basic masonry tasks.

• Best for: Common household projects that require widely available, trusted materials.
• Bottom line: A solid, no-nonsense pick for standard renovations where proven reliability is the main goal.

Woven Wire Lath: Ideal for Curved or Patch Work

Unlike rigid expanded sheets, woven wire lath is flexible and pliable. This makes it superior for projects involving curved walls, rounded corners, or small, odd-shaped patch work. It conforms to the surface rather than fighting against it, allowing for a smooth finish in areas where rigid metal would stick out.

Because it is so flexible, it requires more care during installation to ensure it stays tight against the studs. However, its versatility in tight spots is unmatched by any other lath type.

• Best for: Non-standard architectural features, curves, and awkward repair areas.
• Bottom line: Use this when the shape of the project prevents the use of rigid, sheet-based lath.

Expanded vs. Rib Lath: Which Is Right for You?

Expanded lath consists of a flat, perforated diamond pattern and is suited for general-purpose, thin-set masonry. It is lightweight, inexpensive, and easy to maneuver for a single person. Its main limitation is a lack of vertical stiffness, which can be an issue if the masonry is particularly heavy or the wall height is significant.

Rib lath includes deep, raised channels that provide significant structural depth and support. It is designed for applications where the mortar bed is thick and heavy, such as stone veneer or thick-coat stucco. The extra cost is justified by the prevention of structural sagging and wall deformation over time.

• Consideration: Evaluate the weight of your chosen masonry material before deciding; heavy stone requires the rib.
• Bottom line: Choose expanded for ease and budget; choose rib for strength and heavy loads.

Why Galvanized Steel Is Your Best Bet for Lath

Regardless of the mesh style chosen, the material must be hot-dipped galvanized steel. Rust is the primary cause of lath failure, as expanded metal buried within a mortar bed can corrode if exposed to moisture. Galvanization provides a zinc coating that acts as a sacrificial layer to prevent that oxidation from starting.

Avoid using plain carbon steel, even if the price is enticingly low. Rust will eventually expand and stain the finish of the masonry, while also compromising the bond that holds the wall together. Always check the label to ensure the product is rated for outdoor, moisture-exposed use.

• Best for: Any project that will be exposed to the elements or high-moisture environments.
• Bottom line: Never compromise on galvanization; it is the only way to ensure the longevity of the masonry.

How to Properly Fasten Lath to Your Wall Studs

Proper fastening is the secret to a professional result that will not rattle or crack. Always use galvanized roofing nails or screws with wide heads that effectively capture the mesh wires. The fasteners should be spaced no more than 6 inches apart vertically along the studs to prevent any “oil-canning” or movement.

Ensure that the sheets are overlapped by at least an inch to maintain a continuous, reinforced surface. If the mesh is not secured tightly, the entire wall will vibrate and crack under the weight of the mortar. Take the extra time to ensure every corner is pulled taut and every seam is secure.

• Pro Tip: Use a staple gun designed for lath if the surface is soft wood, but nails are better for long-term hold on hard studs.
• Bottom line: Tight, close-spaced fastening is just as important as the quality of the mesh itself.

By selecting the appropriate metal lath for the specific requirements of the project, a sturdy and long-lasting masonry finish is well within reach. Prioritizing galvanized materials and proper fastening techniques will prevent future headaches and costly maintenance. With the right foundation in place, the masonry work can provide both beauty and durability for years to come.