ASTM C1177/C1177M-24

Annotation of standard text ASTM C1177/C1177M-24 :

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.


Keywords:
core, exterior substrate, fire-resistant classification, flexural strength, glass mat, glass mat gypsum substrate, gypsum, hardness, humidified deflection, nail pull resistance, noncombustible, sheathing, substrate, type X, water resistance, weather barrier ,, ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)