SPF (spruce-pine-fir) consists of three species marketed together as a single group: Lodgepole pine, interior spruce, and subalpine fir. Kiln-dried SPF lumber is used as a structural framing material in all types of residential, commercial, industrial, and agricultural building applications.
SPF yields high-grade timber with relatively small, sound, tight knots. SPF is a distinctly white wood, with very little color variation between springwood and summerwood. The wood has a bright, clean appearance, ranging in color from white to pale yellow, with a fine straight grain and smooth texture.
The dimensional stability of SPF, and its superior gluing properties, make it a popular material within the prefabrication industry. This species group is frequently used in the manufacturing of flat-packed modular furniture; due to its high strength-to-weight ratio, SPF is ideal for use in modular houses, trusses, exterior decking, outdoor furniture, interior finishing, boxes, and packing cases.