This third edition of CSA Standard 0141, Softwood Lumber, supersedes the previous editions published in 1965 and 1959. It establishes voluntary standards for the size, grade and inspection of softwood lumber.
CSA Standard 0141 is intended to provide a common basis for the uniform industry-wide inspection and grade-marking practices for each piece of lumber which is produced and sold in accordance with the provisions hereof. It also provides a standardized working basis for the coordination of the grades of the various species of softwood lumber and for the preparation of grading rules applicable to each species. This CSA Standard is not intended for use either as a grading rule or as a purchase specification
This Standard describes the responsibilities and functions of the Canadian Lumber Standards Division of CSA (See Appendix A).
The grading of lumber is a difficult and involved matter, with species and size of logs being determining factors. In grading, factors affecting appearance and strength, as well as those determining suitability for specific uses, have all to be considered. In addition, there are economic considerations related to the satisfactory disposal of all the lumber sawn from the log. Grading must also be such as to meet the requirements of the producer, the distributor, and the consumer. This Standard was prepared by the CSA Committee on Softwood Lumber Standards under the jurisdiction of the Sectional Committee on Timber, and was formally approved by these Committees.
l. 1 Application
This Standard covers the principal trade classifications and sizes of softwood lumber for yard, structural, and shop use. It provides a common basis of understanding for the classification, measurement, grading, and grade-marking of rough and dressed sizes of various items of lumber, including, finish, boards, dimension, and timbers.
This Standard applies to such lumber as may be identified as a manufactured product derived from a softwood log in a sawmill, or in a sawmill and planing mill, which when rough shall have been sawed, edged, and trimmed at least to the extent of showing saw marks or other marks made in the conversion of logs to lumber on the four longitudinal surfaces of each piece for its overall length, and which has not been further manufactured other than by cross—cutting, ripping, resawing, joining crosswise and/or endwise in a flat plane, surfacing with or without end matching and working.
When hardwood species are used in applications for which softwood species are ordinarily employed they may be classified, measured, graded, and marked under the provisions of this Standard.
1.3 Supplementary Information and Requirements
This Standard also includes the following supplementary information and requirements:
(a) The organization and functions of the Canadian Lumber Standards Administrative Board and Industry Committee, hereinafter referred to as the Board (see Appendix A);
(b) The standard commercial and botanical names of the principal softwood species;
(c) The standard definitions of terms used in describing standard grades of lumber; and
(d) The standard lumber industry abbreviations.