Using Drywall Using Gypsum Board for Walls and Ceilings. The Gypsum Association. Evanston, Ill., 1985. 37 pages. Single copies free from the Association at 1603 Orrington Ave., Evanston, Ill. 60201. by Paul Hanke An excellent short compendium, this booklet contains technical information and practical instruction on the use of gypsum board for walls and ceilings. It opens with a brief introduction to the manufacture and characteristics of gypsum board, plus a definition of terms, such as the difference between an "end" and an "edge." The different types (moistureresistant, fire code, foil-backed, backer board, and pre-decorated) are briefly presented, along with thicknesses, sizes, and edge conditions. The bulk of the booklet is devoted to using the material: site storage, cutting, single- and multilayer application, applying