Western SPF comes from the Canadian provinces of
British Columbia and
Alberta, and the US states of
California,
Idaho,
Montana,
Nevada,
Oregon,
Washington, and
Wyoming. It consists of the following species: • White spruce (
Picea glauca) • Engelmann spruce (
Picea engelmannii) • Lodgepole pine (
Pinus contorta) • Alpine fir (
Abies lasiocarpa)
Random-length lumber futures and
options are traded on the
Chicago Mercantile Exchange, and western SPF is the type of lumber specified in the trading specs. The term
random length is used because even though all the boards are 2x4s, the lengths can be between . == Eastern SPF ==