Douglas Fir Lumber Grades
Lumber of this grade is intended primarely for use in housing and light construction where it is exposed as paneling shelving and other uses where a knotty type of lumber with the finest appearance is required.
Douglas fir lumber grades. Specifying finish siding grades. Douglas fir is technically not a true fir abies genus but is in its own genus. Its strength combined with a superior strength to weight ratio high specific gravity for excellent nail and metal truss plate holding capability excellent dimensional stability giving green df products the ability to season well in service the.
First and most significantly the nhla grading system as its name implies is limited to domestic hardwood lumber. Select grade douglas fir. The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood.
Lumber is graded based on the quality and appearance of the wood. An overview of lumber grades and wood quality. 2x5 through 4x18 intended for engineering applications for lumber 5 and wider such as floor and ceiling joists rafters headers small beams trusses and general framing applications.
S dry means the lumber was kiln dried to a maximum moisture content of 19 percent before it was surfaced. Stud intended for vertical use in load bearing walls is stud grade. These depend on various factors like the type of wood used and the number and types of defects if any.
That means of course that it does not encompass exotic hardwood species such as ipe or mahogany or softwood species such as red cedar or douglas fir. All pictures are meant for a general grade description. In this example the grade is douglas fir e moisture content at the time of surfacing.
Clear vertical grain cvg douglas fir carries a c better grade because it is cut to accentuate the light and dark straight grain pattern of the wood fiber. Structural joists planks intended for use as joist rafters and beams 5 inches and wider includes. Wood that will be used for things like paneling flooring and trim is called appearance grade and as you might expect that means it s evaluated mainly on its looks.
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