Gypsum sheathing: keys for an acceptable installation.(All Things Gypsum) From: Walls & Ceilings | Date: March 1, 2004| Author: Gardner, Michael | COPYRIGHT 2004 BNP Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Paper-faced gypsum sheathing is a gypsum board that is used as a substrate for exterior claddings. It has a noncombustible core, composed essentially of gypsum and is faced with water-repellant paper on its back, front and wrapped edges. It is manufactured with either a square or a tongue-and-groove edge.

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Gypsum sheathing is manufactured to meet the requirements of ASTM C 79 (C 1396), "Standard Specification for Treated Core and Nontrea...