Spruce Pine Fir
Spruce Pine Fir is a classification of lumber which actually consists of four different wood types. There are two different spruces, which are White Spruce (Picea Glauca) and Engelmann Spruce (Picea Engelmanni). There is also Lodgepole Pine (Pinus Contorta) and Alpine Fir (Abies Lasiocarpa). Abbreviated as SPF lumber, Spruce Pine Fir can refer to all four of the above woods, each of which contains very small knots in their lower grades.
SPF Lumber Grades
Higher grades are among the cleaner-looking species of wood, with evenly smooth grains and bright colors. The lower grades are more common around China, which processes the lumber themselves to improve its quality, while Japan invests in the higher grades and makes long-term commitments to shippers in order to keep the construction industry stable. South Korea is the other major importer, investing in higher grades of lumber cut to about twelve feet in length.
SPF Lumber and Logs Demand
It would not be possible to maintain such a specific importation guideline if the wood was not produced steadily, often by Canada and the United States. These four types of wood are commonly grown throughout North America, remaining high in stock due to the lumber’s heavy use and wide array of applications.
The products manufactured by such lumber, aside from standard logs and cuts of specific lengths, are mostly geared toward construction. There are pre-prepared housing elements as well as poles and trusses, not to mention railway ties. SPF lumber is easily dried in a kiln and treated with high temperatures. Since it holds up well, and can easily be used in wooden furniture. This furniture is largely meant for household interiors, though outdoor furniture is certainly not an impossibility.
The use of SPF for support structures extends far beyond the household, reaching into industrial projects as well. It can also be used for agricultural structures such as barns. Even without kiln treatment, the wood is relatively sturdy; preparation only increases its usefulness. Use of the wood in doors and window framing is even more common than its use in furniture. This is as much of a structural decision as it is a decorative one, as the brightly colored lumber can be easily stained or painted. While higher grades are generally used in framing, lower grades can be used in furniture depending upon the desired aesthetic.