The Ultimate Guide to Metal Lath for Stucco
Metal lath is an essential component in the construction industry, particularly for stucco applications. It provides the necessary support for plaster, ensuring durability and stability. This guide aims to provide a comprehensive overview of metal lath, its types, applications, and technical aspects to help you make informed decisions for your projects.
Types of Metal Lath and Their Applications
| Type of Metal Lath | Description | Common Applications | Advantages |
|---|---|---|---|
| Expanded Metal Lath | Made from sheet steel that is slit and expanded, forming a mesh with hundreds of “keys” per square yard. | Stucco, plaster, fireproofing, ceilings, and ornamental work. | Exceptional strength, flexibility, and excellent adhesion. |
| Diamond Mesh Lath | Features a diamond pattern that provides a sturdy base for plaster and stucco. | General-purpose applications, ceilings, soffits, and ceramic tile underlayment. | Multi-purpose, strong structure, and ideal for both flat and contoured surfaces. |
| 3.4# Galvanized Lath | Heavier gauge lath that offers superior strength and support. | High-stress areas, commercial buildings, and heavy-duty stucco applications. | Increased durability and resistance to weather elements. |
| 2.5# Galvanized Lath | Lighter gauge lath that is versatile and easy to handle. | Residential projects and light commercial applications. | Cost-effective and suitable for various stucco projects. |
| Wire Lath | Typically made from steel wire, this type is often used for thin coat stucco systems. | Thin coat stucco systems and small repairs. | Lightweight and easy to install; allows for a smooth finish. |
Understanding Metal Lath
What is Metal Lath?
Metal lath is a building material commonly utilized as a substrate for plaster or stucco applications. It is produced by expanding and perforating metal sheets to create a network of small, uniform openings. This rough texture facilitates secure adhesion of plaster or stucco, making it ideal for reinforcing various surfaces like walls and ceilings.
Benefits of Using Metal Lath
Metal lath offers several advantages, including:
- Strong Bonding: The textured surface enhances adhesion, ensuring a solid bond between the stucco and the substrate.
- Flexibility: Metal lath can easily conform to different shapes and surfaces, making it suitable for both flat and contoured applications.
- Durability: Galvanized options resist rust and corrosion, providing longevity in outdoor applications.
Installation Techniques for Metal Lath
Preparing the Surface
Before installing metal lath, it’s crucial to prepare the surface adequately:
- Clean the Area: Ensure the surface is free from dust, dirt, and debris.
- Check for Moisture: Make sure the substrate is dry to prevent mold and mildew.
- Install a Weather Barrier: If applying outdoors, a weather-resistant barrier should be installed first.
Installing Metal Lath
- Cutting the Lath: Use metal shears to cut the lath to the required sizes.
- Securing the Lath: Fasten the lath to the substrate using appropriate fasteners, such as screws or nails, ensuring it is tight against the wall.
- Overlap the Edges: Make sure to overlap edges by at least one inch to maintain a continuous surface.
- Apply Stucco: Once the lath is securely in place, the stucco can be applied, embedding it into the lath for a strong bond.
Common Mistakes to Avoid
- Inadequate Fastening: Ensure the metal lath is securely attached; loose lath can lead to cracking.
- Ignoring Weather Conditions: Avoid installing lath during wet or extremely cold weather to ensure proper adhesion and curing.
- Skipping the Weather Barrier: Always install a weather-resistant barrier beneath the lath for exterior applications to prevent moisture damage.
Technical Features of Metal Lath
| Feature | 2.5# Galvanized Lath | 3.4# Galvanized Lath | Diamond Mesh Lath | Wire Lath |
|---|---|---|---|---|
| Material | G60 Galvanized Steel | G90 Galvanized Steel | G60 Galvanized Steel | Steel Wire |
| Weight Per Square Yard | 2.5 lbs | 3.4 lbs | 2.5 lbs | Varies |
| Typical Applications | Residential projects | Commercial projects | General-purpose | Thin coat systems |
| Coating | Galvanized | Galvanized | Galvanized | Uncoated |
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Conclusion
Metal lath is a critical element in the construction of stucco applications, providing strength, flexibility, and durability. Understanding the different types of metal lath, their applications, and installation techniques is essential for ensuring successful stucco projects. Whether you are a contractor or a DIY enthusiast, using the right metal lath will significantly enhance the quality and longevity of your work.
FAQ
What is metal lath?
Metal lath is a building material made from expanded or perforated metal sheets, used as a base for plaster or stucco applications to enhance adhesion and support.
What types of metal lath are available?
The most common types include expanded metal lath, diamond mesh lath, galvanized lath, and wire lath, each suited for different applications.
How do you install metal lath?
Installation involves preparing the surface, cutting the lath to size, securing it with fasteners, and ensuring proper overlap before applying stucco.
What are the benefits of using metal lath?
Benefits include strong bonding, flexibility for various shapes, and durability against rust and corrosion.
Can metal lath be used for interior applications?
Yes, metal lath is versatile and suitable for both interior and exterior applications, including ceilings and walls.
What should I avoid when installing metal lath?
Avoid inadequate fastening, ignoring weather conditions, and skipping the installation of a weather barrier for outdoor projects.
Is metal lath resistant to weather?
Galvanized metal lath is designed to resist rust and corrosion, making it suitable for outdoor applications.
How does metal lath differ from metal mesh?
While both serve as reinforcement, metal lath is specifically designed with a rough surface for adhesive bonding with stucco or plaster, while metal mesh typically serves different structural purposes.
What is the weight difference between 2.5# and 3.4# galvanized lath?
The 2.5# lath weighs 2.5 lbs per square yard, while the 3.4# lath weighs 3.4 lbs per square yard, offering different levels of strength for various applications.
Where can I buy metal lath?
Metal lath can be purchased from home improvement stores like www.homedepot.com and www.lowes.com, as well as specialized suppliers like www.clarkdietrich.com and amicoglobal.com.