This second edition of CSA Standard 0141 covers the principal trade classifications of 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 boards, dimensions, and timbers.
This Standard describes the responsibilities and functions of the Canadian Lumber Standards Division of Canadian Standards Association (Appendix A).
This Standard also lists the commercial and botanical names of the principal softwood species (Appendix B), the standard lumber abbreviations (Appendix C), definitions of terms used in describing grades of lumber (Appendix D), and the approved facsimiles of the Grade-Marks of the Associations and Agencies authorized to grade-mark Canadian lumber (Appendix F).
Standard terms and practices are defined and discussed to encourage and promote the use of uniform methods in the grading, inspection, measurement, and description of softwood lumber.
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 has been prepared by the Committee on Softwood Lumber Standards under the jurisdiction of the Sectional Committee on Timber, and has been formally approved by these Committees and the CSA Technical Council.
This Standard applies to Canadian softwood lumber and provides a common basis for uniform definitions, terminology, measurement, tally, classification, grading provisions and requirements for grade-marking.
Lumber conforming to the basic minimum size and grade provisions of this Standard and graded under approved rules may be designated CLS Lumber.
This Standard is not intended for use as a grading rule or purchase specification.