Active Standard: C1177 / C1177M - 13
The purpose of the revision is to specify that gypsum used in the manufacture of the gypsum panel products covered by this specification complies with ASTM C22, Standard Specification for Gypsum. The change adds the requirement to Section 4.1 and places a reference to C22 in the list of reference standards in Section 2.1. This change is consistent with the current language in C1396/C1396M. This change is being balloted for C318, C1177, C1177, and C1658.
Keywordscore; 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; Exterior gypsum substrate; Fire-resistant classification; Glass mat gypsum board; Gypsum products--specifications; Humidified deflection; Nail pull resistance; Sheaths/sheathing--specifications; Substrates; Water-resistant gypsum board--specifications;
Ballot Item Approved as C1177/C1177M-2013 and Pending Publication