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In 1961, at a meeting in Scottsdale, Arizona, the Committee on Grade Simplification and Standardization agreed to what is now the current U.S. standard: in part, the dressed size of a 1-inch (nominal) board was fixed at 3 ⁄ 4 inch; while the dressed size of 2 inch (nominal) lumber was reduced from 1 + 5 ⁄ 8 inch to the current 1 + 1 ⁄ 2 inch.
Lumber is then grouped based on the grade. To create lengths of glulam longer than those typically available for sawn lumber, the lumber must be end-jointed. The most common joint for this is a finger joint , 1.1 in (2.8 cm) in length that is cut on either end with special cutter heads.
Five grades of OSB are defined in EN 300 in terms of their mechanical performance and relative resistance to moisture: [2] OSB/0 – No added formaldehyde; OSB/1 – General-purpose boards and boards for interior fitments (including furniture) for use in dry conditions; OSB/2 – Load-bearing boards for use in dry conditions
CLS was originally a product of Canada used in the construction of sturdy timber-framed houses as rated by the Canadian Lumber Standards Accreditation Board (CLSAB). [1] [2] Following the end of the Cold War it was increasingly used by manufacturers in Baltic countries as a reference grade for export to the UK and other Western European ...
The Central Committee on Lumber Standards was started in 1922 by Herbert Hoover when he was U.S. Secretary of Commerce at the request of the lumber industry. [4] Chaired by John W. Blodgett, the Central Committee was intended to be a way to create voluntary lumber standards without imposing formal government regulations, in order to solve the problem of lumber manufacturers selling lumber that ...
Cross-laminated timber (CLT) is a subcategory of engineered wood [1] panel product made from gluing together at least three layers [2] of solid-sawn lumber (i.e. lumber cut from a single log). [3] The grain of each layer of boards is usually rotated 90 degrees from that of adjacent layers and glued on the wide faces of each board, usually in a ...
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Black spruce stand at Arctic Chalet, Inuvik, NT Spruce-pine-fir (SPF) is a classification of lumber that can be traded on commodities exchanges.. In Canada, and parts of the United States, most of the spruce tree species, pine tree species, and fir tree species share similar physical and mechanical characteristics, to the point where lumber derived from any of these species are interchangeable ...