Search results
Results from the WOW.Com Content Network
In the United States, pilings are mainly cut from southern yellow pines and Douglas-fir. Treated pilings are available in chromated copper arsenate retentions of 0.60, 0.80 and 2.50 pounds per cubic foot (9.6, 12.8 and 40.0 kg/m 3) if treatment is required.
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 ...
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.
Pseudotsuga japonica, the Japanese Douglas-fir, is a species of conifer in the pine family, Pinaceae, that is endemic to Japan. [ 1 ] [ 3 ] [ 4 ] It is a medium-sized tree growing to 25 m (82 ft) tall. [ 3 ]
Pseudotsuga menziesii var. lindleyana, commonly known as the Mexican Douglas-fir, is a conifer in the genus Pseudotsuga that is endemic to Mexico. [1] DNA sequence [2] and morphological [3] evidence suggests it is most closely related to Rocky Mountain Douglas-fir (P. menziesii var. glauca) and might best be treated as an additional variety within P. menziesii.
Within the USA fir, also known as Douglas fir, is inexpensive and common at local home centers. It has a characteristic straight, pronounced grain with a red-brown tint. However, its grain pattern is relatively plain and it does not stain well, so fir is commonly used when the finished product will be painted.
Pseudotsuga sinensis (Chinese Douglas-fir; in Chinese 黃杉, pinyin romanization: huáng shān) is a species of conifer in the family Pinaceae. It is a tree that grows up to 50 metres (160 ft) tall. [ 2 ]
Incisions made in sawed material usually are parallel with the grain of the wood. This process is common in North America (since the 1950s), where Douglas-fir products and pole butts of various species are prepared before treatment. It is most useful for woods that are resistant to side penetration, but allow preservative transport along the grain.