ASTM C840-20 PDF Download

The ASTM C840-20 standard outlines the requirements for the methods of application and finishing of gypsum board. The standard covers various aspects of gypsum board construction, such as fire resistance, sound control, framing size, fastener spacing, substrate preparation, cutting, and installation application.

The document emphasizes the importance of obtaining construction details for specific assemblies from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories. It also highlights the need for complying with acoustical tests when sound control is required for a gypsum board assembly.

The standard categorizes different materials, including gypsum boards, gypsum wallboards, gypsum backing board and coreboard, water-resistant gypsum backing board, exterior gypsum soffit board, and gypsum ceiling board. It also specifies the use of various finishing materials such as compounds, joint tape, fasteners, nails, screws, and staples.

In addition, the standard provides guidance on the proper storage and handling of gypsum board, including protection from moisture and direct sunlight exposure. It also includes sections that detail different application systems for gypsum board installation, such as single-ply and two-ply gypsum board application to wood framing members, adhesive nail-on application, partitions, application to interior masonry or concrete walls, application to rigid foam insulation, application to steel framing and furring, tile adhesive application, exterior application, floating interior angles, control joints, foil-backed gypsum board, and vinyl-faced gypsum board.

It is important to note that the standard references various notes and footnotes for explanatory purposes, but these notes and footnotes are not considered requirements of the specification. The standard also includes specific precautionary statements for safety considerations.