ASTM C1242-21 PDF Download

The ASTM C1242-21 standard provides guidance for architects, engineers, and contractors involved in the design and installation of exterior stone cladding for architectural structures.

The standard serves as an industry benchmark for considerations in engineering design, documentation, material selection, anchor applications, and installation workmanship. It emphasizes the importance of ensuring compatibility between the stone and its support systems, such as curtain walls and the building's superstructure frame. Compliance with applicable building codes is essential for every stone work application.

While this guide does not supersede recommendations for specific stone types published by the dimension stone industry, it should be reviewed along with other industry publications to ensure project specifications and requirements are met. The expertise of a stone specialist may be required in certain conditions, such as when complex connections, unknown anchor performance records, multiple cladding materials, flexible supporting structures, extreme loading, or special building code requirements are present.

In terms of scope, the guide covers the design principles and requirements for the selection of anchors and anchoring systems that can resist gravity loads and applied loads. It addresses the anchoring of stone panels directly to the building structure, as well as to subframes or curtainwall components. The guide also includes provisions for the supervision and inspection of fabrication and installation processes.