Expanded diamond-mesh metal lath products have long been a key component of stucco-clad building exteriors, which consist of plaster applied over wood or gypsum sheathing. Though expanded metal lath may appear to be a rather basic, uncomplicated building material, the expanded metal lath product specified, and the way it is installed, has a huge impact on the long-term stability of the plaster it supports. Since not all metal lath products are created equally in terms of quality, it is crucial to research the performance attributes of each product being considered before making a final decision.
Fortunately, there are several building codes and industry standards available today to steer specifiers toward a high-performance expanded metal lath product and installers toward proper installation steps. In this article, we will cover industry guidelines for selecting metal lath products that meet the requirements of current international building codes. In addition, we will share common metal lath installation errors and counter them with the proper installation techniques. Adherence to the guidelines in each of these disciplines can help building and design professionals produce stable, long-lasting exterior wall assemblies.