Expanded Metal Laths Definition (Official & Technical)

Expanded Metal Laths Definition: Expanded metal laths are lightweight, ribbed expanded metal sheets manufactured by slitting and stretching cold-rolled steel, galvanized steel, or stainless steel coils into a uniform diamond pattern. They are designed to reinforce plaster, stucco, and cement coatings, improve adhesion, and prevent cracking in construction surfaces.

Also known as metal lath, expanded lath, or plaster lath, this product is a core construction material for masonry and plastering applications. Unlike welded mesh laths, expanded metal laths are made from a single sheet of metal (no welds), making them stronger and more durable.

Our expanded metal laths are manufactured in strict compliance with ASTM C1063 and EN international construction standards for professional building use.

Core Characteristics of Expanded Metal Laths

Based on the standard expanded metal laths definition, these products feature unique structural properties:

• Single-Piece Construction: No welding or joining – made from one continuous metal sheet
• Diamond Pattern Openings: Uniform diamond holes for maximum mortar adhesion
• Self-Furring Ribs: Raised ribs that create space for plaster to lock behind
• Lightweight & Flexible: Easy to bend, cut, and install on curved or flat surfaces
• High Tensile Strength: Prevents plaster cracking and surface damage
• Corrosion Resistance: Galvanized coating for long-term indoor/outdoor use
• Breathable Structure: Allows moisture escape to extend wall life

Standard Specifications of Expanded Metal Laths

All expanded metal lath sizes and materials can be customized to meet your specific construction project requirements.

Primary Uses of Expanded Metal Laths

Following the expanded metal laths definition, this product is used for professional reinforcement in construction:

• Plaster Reinforcement: Interior wall and ceiling plaster base layers
• Stucco Application: Exterior wall stucco reinforcement for buildings
• Concrete Repair: Repair and resurfacing of concrete columns and beams
• Masonry Support: Reinforcement for brick, block, and stone walls
• Curved Surfaces: Ideal for arches, columns, and curved walls (flexible design)
• Fireproofing: Base layer for fire-resistant coatings on structural steel

Expanded metal laths are also used as a lightweight base material for decorative wall panels and exterior facade systems in modern architecture.

Types of Expanded Metal Laths (By Definition)

There are several types of expanded metal laths classified by material and design:

1. Galvanized Expanded Metal Lath
The most common type, with zinc coating for rust resistance. Used for both interior and exterior construction.

2. Stainless Steel Expanded Metal Lath
Highest corrosion resistance, used in wet areas, swimming pools, and coastal construction.

3. Self-Furring Expanded Metal Lath
Features raised ribs to create a 1/4″ gap for plaster locking – the industry standard for stucco.

4. Flat Expanded Metal Lath
Smooth, flat surface used for thin interior plaster and lightweight applications.

Our Manufacturing & Quality Control

With over 20 years of experience in metal mesh manufacturing, we produce premium expanded metal laths that fully match the official expanded metal laths definition and international standards:

• CNC automatic expanding machines for precise diamond openings
• High-tensile thin-gauge steel coils for professional lath production
• Hot-dip galvanizing line for long-lasting corrosion resistance
• Full dimensional and strength inspection for every batch
• ISO 9001 & ASTM C1063 certified production system

Our expanded metal laths are trusted by contractors, builders, and construction companies worldwide for reliable performance and consistent quality.