ICC-ES AC191
Full Name
ICC-ES AC191 – Acceptance Criteria for Metal Plaster Bases (Lath)
Scope
ICC-ES AC191 outlines the acceptance criteria for evaluating metal plaster bases (lath) used in building construction. The criteria focus on ensuring the lath’s suitability and performance in various plastering applications.
Key aspects covered by AC191 include:
- Material requirements: specifying the acceptable types of metal (e.g., steel) and coatings (e.g., galvanized) for the lath, along with their required properties for strength, corrosion resistance, and compatibility with plaster.
- Physical properties: defining minimum requirements for the lath’s weight, dimensions, mesh size, and other physical characteristics to ensure adequate support for the plaster and proper keying.
- Performance testing: outlining standardized testing methods to evaluate the lath’s performance under various conditions, including bond strength, shear resistance, and impact resistance.
- Installation guidelines: providing recommendations for proper installation of the lath to ensure optimal performance and compatibility with different types of plaster and substrates.
By adhering to AC191, manufacturers can demonstrate that their metal plaster bases meet the necessary standards for quality, durability, and performance in plastering applications. This helps ensure the structural integrity and longevity of plastered walls and ceilings in buildings.
Resources
Keywords
metal plaster bases; lath; acceptance criteria; steel; galvanized coating; corrosion resistance; weight; dimensions; mesh size; bond strength; shear resistance; impact resistance