Metal Lath For Stucco: Types, Uses, And Installation

Metal lath is a crucial component in stucco systems, providing a durable base for the stucco to adhere to. It's a versatile material used in both interior and exterior wall construction. This comprehensive guide will cover everything you need to know about metal lath for stucco, from its types and uses to installation best practices.

What is Metal Lath?

Metal lath is a type of expanded metal or woven wire mesh used as a substrate for plaster or stucco. It's designed to provide a mechanical key for the stucco, ensuring a strong and lasting bond. The lath is typically made from galvanized steel to prevent corrosion, but other materials like stainless steel are also available for specific applications.

Types of Metal Lath

There are several types of metal lath, each suited for different stucco applications. The most common types include: — NYC Mayoral Election: Date & Key Info

• Expanded Metal Lath: This is the most widely used type, made by slitting and stretching sheets of metal to create a mesh pattern. It comes in various weights and designs, such as diamond mesh, rib lath, and self-furring lath.
• Woven Wire Lath: Made from woven wires, this type offers high tensile strength and is often used in curved surfaces or areas requiring extra reinforcement.
• Welded Wire Lath: This type consists of wires welded together, forming a rigid mesh. It's commonly used in veneer stone and thin brick applications.

Uses of Metal Lath in Stucco

Metal lath plays a vital role in stucco systems, serving several key functions:

• Providing a Mechanical Key: The mesh design of metal lath creates a rough surface that the stucco can grip onto, ensuring a strong bond. This mechanical key is essential for the longevity of the stucco system.
• Reinforcing the Stucco: Metal lath adds strength and rigidity to the stucco, helping to prevent cracking and other damage. It distributes stress evenly across the surface, enhancing the stucco's durability.
• Creating a Uniform Thickness: Metal lath helps maintain a consistent stucco thickness, which is crucial for achieving a smooth and even finish. This is especially important in multi-coat stucco systems.
• Supporting the Stucco During Application: Metal lath provides temporary support for the stucco while it cures, preventing it from sagging or slumping. This support is particularly important in vertical applications.

Applications of Metal Lath

Metal lath is used in a variety of stucco applications, including:

• Exterior Stucco Walls: Metal lath is a standard component in traditional three-coat stucco systems, providing the necessary reinforcement and mechanical key for the stucco.
• Interior Plaster Walls: Metal lath can also be used as a substrate for plaster in interior walls, offering a durable and fire-resistant finish.
• Veneer Stone and Thin Brick: Welded wire lath is commonly used in veneer stone and thin brick applications, providing a strong base for these materials.
• Curved Surfaces and Arches: Woven wire lath is often used in curved surfaces and arches due to its flexibility and high tensile strength.

Installation of Metal Lath for Stucco

Proper installation of metal lath is critical for the performance and longevity of the stucco system. Here are the key steps involved in the installation process:

1. Surface Preparation: Ensure the substrate is clean, dry, and free of any loose materials. Repair any damaged areas before installing the lath.
2. Cutting the Lath: Use tin snips or a metal cutting tool to cut the lath to the required size. Overlap the lath sheets by at least 1 inch on the sides and 2 inches on the ends.
3. Attaching the Lath: Secure the lath to the substrate using nails, screws, or staples. The fasteners should penetrate the framing members by at least 1 inch. Space the fasteners 6 inches apart vertically and 16 inches apart horizontally.
4. Overlapping and Tying: Overlap the lath sheets properly and tie them together using tie wire. This ensures a continuous and reinforced surface for the stucco.
5. Accessories: Install corner beads, casing beads, and other accessories as needed. These accessories provide clean edges and help control the stucco thickness.

Best Practices for Metal Lath Installation

• Use Galvanized Lath: Always use galvanized metal lath to prevent corrosion. In coastal areas or harsh environments, consider using stainless steel lath for added protection.
• Proper Fastening: Use the correct type and spacing of fasteners to ensure the lath is securely attached to the substrate.
• Overlap Correctly: Overlap the lath sheets according to the manufacturer's instructions to maintain a continuous surface.
• Install Accessories: Use corner beads, casing beads, and other accessories to create clean edges and control the stucco thickness.
• Inspect the Installation: Before applying stucco, inspect the lath installation to ensure it's properly attached and there are no gaps or loose areas.

Common Issues with Metal Lath and Stucco

While metal lath is a durable material, several issues can arise if it's not installed correctly or if the stucco system is not maintained properly. Some common problems include: — Homes For Sale In Aberdeen SD | Updated Daily

• Corrosion: If the metal lath is not galvanized or if the galvanization is damaged, it can corrode over time, weakening the stucco system. Proper installation and maintenance can help prevent corrosion.
• Cracking: Cracks in the stucco can occur due to various factors, including improper lath installation, inadequate stucco thickness, or building movement. Using metal lath can help minimize cracks in stucco.
• Delamination: Delamination, or the separation of the stucco layers, can occur if the stucco is not properly bonded to the lath. Proper surface preparation and lath installation are essential to prevent delamination.

How to Prevent Stucco Problems

To prevent issues with metal lath and stucco, follow these best practices: — Oglesby, IL Weather Forecast & Conditions

• Use Quality Materials: Choose high-quality metal lath and stucco materials.
• Proper Installation: Follow the manufacturer's instructions and industry best practices for lath and stucco installation.
• Maintenance: Regularly inspect the stucco for cracks or damage, and repair any issues promptly.
• Drainage: Ensure proper drainage around the building to prevent water from penetrating the stucco system.

Conclusion

Metal lath is an essential component in stucco systems, providing the necessary reinforcement and mechanical key for a durable and long-lasting finish. By understanding the different types of metal lath, their uses, and proper installation techniques, you can ensure a successful stucco project. Whether you're building a new home or renovating an existing one, metal lath is a reliable choice for creating beautiful and durable stucco walls. When properly installed and maintained, metal lath and stucco can provide decades of protection and aesthetic appeal.

FAQs About Metal Lath for Stucco

What is the primary purpose of metal lath in stucco?

The primary purpose of metal lath in stucco is to provide a mechanical key for the stucco, ensuring a strong bond. It also reinforces the stucco, helping to prevent cracking and other damage.

What are the different types of metal lath?

The most common types of metal lath include expanded metal lath, woven wire lath, and welded wire lath. Each type has unique properties and is suited for different applications.

How is metal lath installed for stucco?

Metal lath is installed by attaching it to the substrate using nails, screws, or staples. The lath sheets are overlapped and tied together to create a continuous surface.

What are some common issues with metal lath and stucco?

Common issues include corrosion, cracking, and delamination. These problems can be prevented by using quality materials, proper installation techniques, and regular maintenance.

How can I ensure proper drainage around stucco walls?

Proper drainage can be ensured by grading the ground away from the building, installing gutters and downspouts, and using a waterproof membrane behind the stucco.