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It is a single span, with a total structure length of 180 feet (55 m) and a span length of 163 feet (50 m). Its total width is 30 feet (9.1 m), and it has a roadway width of 19 feet 3 inches (5.87 m). Its trusses are built out of Douglas fir, and its roof is corrugated metal. The exterior is clad in vertical board-and-batten siding. [2]
Douglas-fir is one of the world's best timber-producing species and yields more timber than any other species in North America, making the forestlands of western Oregon, Washington, and British Columbia the most productive on the continent. In 2011, Douglas-fir represented 34.2% of US lumber exports, to a total of 1.053 billion board-feet.
The building is constructed of Douglas Fir framing on twelve-inch (305 mm) centers holding smooth redwood plank tongue and groove siding with redwood sleepers, ground sills and redwood exterior ornamental features. It is founded on plastered brick which surrounds the dirt floor basement and forms a pedestal to support the rest of the framing.
Upper and lower girders held the vertical planks in position. Exterior siding was high quality, quarter-sawn, 1/2"x6" horizontal cedar lap siding with tight-edge grain and a 5 3/4" exposure attached with square iron nails. Rough-sawn corner boards were used on all building corners. [3] Windows were all of Douglas-fir (Pseudotsuga menziesii ...
Softwood plywood is usually made either of cedar, Douglas fir or spruce, pine, and fir (collectively known as spruce-pine-fir or SPF) or redwood and is typically used for construction and industrial purposes. [12] 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.
Timber is classified by tree species (e.g., southern pine, douglas fir, etc.) and its strength is graded using numerous coefficients that correspond to the number of knots, the moisture content, the temperature, the grain direction, the number of holes, and other factors.
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[citation needed] PSL can be made from any wood species, but Douglas fir, southern pine, western hemlock, and yellow poplar are commonly chosen [9] because of their superior strength. The product is manufactured as a 12-by-12-inch (300 mm × 300 mm) or 12-by-18-inch (300 mm × 460 mm) billet in a rectangular cross-section, which is then ...
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