A large number of softwood trees that grow in Canada and the United States have virtually identical characteristics for constructional purposes. These trees are sawn, planed and graded for strength all together. The major group is referred to as spruce pine fir (SPF). This is the lumber from:
Abies div. spec. Picea div. spec. Pinus div. spec.
Canada and the United States.
Height generally 20-60 m with a diameter of 0.4-1.2 m
Squared, rectangular wood planed to measure.
It’s colour is light yellow to light brown. SPF is graded into construction wood in accordance with American Lumber Standards (ALS) and Canadian Lumber Standards (CLS). These standards set requirements of the exactness of dimensions and the selection of the produced wood into strength classes based on the natural imperfections. Stamping each piece of the selected class makes checking for the right strength far easier. SPF construction wood is generally rectangular, planed to measure, with rounded-off corners.
Wood type: softwood
The SPF standard dimensions are eminently suitable for floors, beams and trussing in wooden frame constructions.