This standard is being revised to amend paragraph 4.1 to require gypsum substrate for use as sheathing be made from gypsum governed by C22. The revision is being proposed to satisfy the requirements of H.R. 4212, the Drywall Safety Act of 2012 (the Act), which mandates the creation of a test method that would evaluate and set limits for the sulfur content of drywall. Another part of this Act required enhanced labeling requirements for drywall, which has been completed with a revision to C1264 in November 1, 2011. A copy of the Act is available as a supporting document in the Committee Documents area. Neither the act nor ASTM C11 provides a definition of the term drywall, thus, for the purpose of this revision to ASTM C471 Test Methods and other product standards, drywall will be construed to be equivalent to the generic term, gypsum panel products, as published in ASTM C1110a. Consultants for the Consumer Products Safety Commission (CPSC) identified an allotrope of elemental sulfur, known as S8, to be present in drywall products that exhibit the so-called Chinese drywall syndrome where a corrosive sulfur compound is emitted from the drywall that attacks various reactive metals, primarily copper. This test method has been proposed by the CPSC as the mechanism to identify drywall products that will be subject to the Act.
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;
Draft Under Development