Chapter 5--Commercial Lumber
Chapter 5 Commercial Lumber Kent A. McDonald and David E. Kretschmann n a broad sense, commercial lumber is any lumber Contents that is bought or sold in the normal channels of Hardwood Lumber 5–1 commerce. Commercial lumber may be found in a variety of forms, species, and types, and in various commer- Factory Lumber 5–2 cial establishments, both wholesale and retail. Most com- Dimension and Component Parts 5–2 mercial lumber is graded by standardized rules that make purchasing more or less uniform throughout the country. Finished Market Products 5–6 When sawn, a log yields lumber of varying quality. To Lumber Species 5–7 enable users to buy the quality that best suits their purposes, Softwood Lumber 5–7 lumber is graded into use categories, each having an appro- priate range in quality. Lumber Grades 5–7 Lumber Manufacture 5–10 Generally, the grade of a piece of lumber is based on the number, character, and location of features that may lower the Softwood Lumber Species 5–12 strength, durability, or utility value of the lumber. Among Softwood Lumber Grading 5–12 the more common visual features are knots, checks, pitch pockets, shake, and stain, some of which are a natural part of Purchase of Lumber 5–12 the tree. Some grades are free or practically free from these features. Other grades, which constitute the great bulk of Retail Yard Inventory 5–16 lumber, contain fairly numerous knots and other features. Important Purchase Considerations 5–17 With proper grading, lumber containing these features is entirely satisfactory for many uses.
[Show full text]