Douglas Fir Lumber Grade Chart. To the left is an example of a grade stamp with each part numbered and defined. 4 square j grade produced in our spf mills located in alberta and southern british columbia our clean and bright spf 4 square j grade lumber sets the standard for north american lumber. First and most significantly the nhla grading system as its name implies is limited to domestic hardwood lumber.
First and most significantly the nhla grading system as its name implies is limited to domestic hardwood lumber. The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood.
Douglas fir structural timbers are available on a special order basis.
Structural wood lumber engineering properties chart 2 to 4 thick 2 and wider. Know all lumber s standard grades seasoned to the consumer s needs. Lumber manufacturer in canada produced for either the structural or the appearance market. Extreme fiber stress in bending f b psi tension parallel to grain f t horizontal shear f v compression perpendicular to grain.
