This is the first edition of CSA Standard A82.27-MI977, Gypsum Board Products, written in SI le Système international d'unités). It is one of the CSA Series of Standards on Gypsum and Lime.
A82.27-M1977 now covers all types of gypsum board and it includes the requirements previously contained in CSA Standards A82.24-1962, Gypsum Lath; A82.27-1972, Gypsum Wallboard; A82.28-1962, Gypsum Sheathing Board; and A82.35-1966, Gypsum Backing Board and Coreboard. It therefore supersedes A82.24-1962, A82.27-1972, A82.28-1962, and A82.35-1966.
In addition, sections have been added to clarify terminology and types of gypsum board products and additional performance properties have been included for. core, end and edge hardness, nailhead pull resistance, and humidified deflection. The Appendices Include tables to assist the user in converting metric measurements to the yard/pound system so that In effect the Standard may be readily used with both systems of measurement.
This Standard was prepared by the Technical Committee on Gypsum and Lime under the jurisdiction of the Standards Steering Committee on Building Materials and Products and was formally approved by these Committees.
This Standard covers requirements for gypsum board designed for use with or without the addition of plaster, for walls, ceilings, and partitions.