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ASTM C1177/C1177M-24

Current Revision

Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing

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1.1 This specification covers glass mat gypsum substrate, which is designed to be used as an exterior substrate for a weather barrier.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


This specification covers the requirements for glass mat gypsum substrates designed to be used as exterior substrate or sheathing for weather barriers. The substrates shall consist of a noncombustible water-resistant gypsum core, surfaced with glass mat partially or completely embedded in the core. Materials shall be sampled, tested, and conform accordingly to specified physical property (flexural strength, humidified deflection, nail pull resistance, water resistance, and core, end, and edge hardness) and dimensional (thickness, width, length, end squareness, and edges) requirements.


SDO ASTM: ASTM International
Document Number C1177
Publication Date April 1, 2024
Language en - English
Page Count 3
Revision Level 24
Supercedes
Committee C11.01
Publish Date Document Id Type View
April 1, 2024 C1177_C1177M-24 Revision
Dec. 1, 2017 C1177_C1177M-17 Revision
Oct. 1, 2013 C1177_C1177M-13 Revision
Sept. 15, 2008 C1177_C1177M-08 Revision
June 1, 2006 C1177_C1177M-06 Revision
Jan. 1, 2004 C1177_C1177M-04E01 Revision
Jan. 1, 2004 C1177_C1177M-04 Revision
May 10, 2001 C1177_C1177M-99 Revision
May 10, 2001 C1177_C1177M-01 Revision