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Random-length lumber futures and options are traded on the Chicago Mercantile Exchange, and western SPF is the type of lumber specified in the trading specs. [3] The term random length is used because even though all the boards are 2x4s, the lengths can be between 2.4 and 6.1 metres (8 and 20 ft).
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.
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 ...
Typically R-5.6 (RSI-0.99) [8] or slightly better after stabilization – higher values (at least R-7, or RSI-1.23) in stabilized boards. [9] Less flammable than polyurethane. Phenolic injection foam Such as Tripolymer R-5.1 per inch (ASTM-C-177). Known for its air sealing abilities.
In 2005, Canadian production was 10,500,000 m 2 (113,000,000 sq ft) (3 ⁄ 8 in or 9.53 mm basis) of which 8,780,000 m 2 (94,500,000 sq ft) (3 ⁄ 8 inch) were exported, almost entirely to the United States. [8] In 2014, Romania became the largest OSB exporting country in Europe, with 28% of the exports going to Russia and 16% to Ukraine. [9]
The most common dimension is 1.2 by 2.4 metres (3 ft 11 in × 7 ft 10 in) or the slightly larger imperial dimension of 4 feet × 8 feet. Plies vary in thickness from 1.4 mm to 4.3 mm. The number of plies—which is always odd—depends on the thickness and grade of the sheet. Roofing can use the thinner 16-millimetre (5 ⁄ 8 in