Lodgepole pine, interior spruce and subalpine fir are marketed together as a single species group: spruce-pine-fir (SPF). Kiln-dried SPF lumber is used as a structural framing material in all types of residential, commercial, industrial and agricultural building applications.
All yield 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 the superior gluing properties make it popular in the prefabrication industry. Due to its high strength–to-weight ratio, it is ideal for modular houses, trusses, exterior decking, outdoor furniture, interior finishing, boxes and packing cases. This species group is often used in the manufacturing of flat-packed modular furniture.