ASTM C1861 is the standard specification for lathing and furring accessories, and fasteners, used with interior and exterior Portland cement-based plaster. It defines a technical basis for identifying and evaluating the components that support plaster installation, helping ensure the assembly is suitable for the intended application. For contractors, specifiers, and purchasers, this standard is useful because it supports more consistent product selection and clearer compliance expectations across plaster system components.

Purpose of ASTM C1861

The purpose of ASTM C1861 is to provide a common specification for the accessories and fasteners used in lathing and furring applications for Portland cement-based plaster. By focusing on these supporting components, the standard helps establish a consistent technical reference for materials that contribute to attachment, spacing, and assembly performance. In practice, it gives project teams and suppliers a clearer basis for product evaluation, documentation, and conformance review.

Common use cases of ASTM C1861

This standard is commonly used when selecting or specifying lathing and furring accessories and fasteners for plaster systems in interior or exterior work. It is relevant to projects using Portland cement-based plaster where supporting components must be matched to the installation requirements and exposure conditions. ASTM C1861 is also useful in procurement and quality control workflows when comparing products, checking submittals, or confirming that the chosen accessories align with the project specification.

Why ASTM C1861 matters

ASTM C1861 matters because the performance of a plaster system depends not only on the finish material, but also on the accessories and fasteners that hold it in place. A clear specification helps reduce uncertainty during product selection, supports compliance with project documents, and can improve consistency across installations. For owners, contractors, and inspectors, it provides a practical reference for evaluating components and lowering the risk of mismatched or unsuitable materials.

• Lathing accessories
• Furring accessories
• Fasteners for plaster systems
• Interior and exterior use
• Portland cement-based plaster applications