Douglas Fir Lumber Properties

Related lumber wood engineering data.

Douglas fir lumber properties.

Douglas fir timber properties. Excellent screw and nail holding. As we know douglas fir wood is the perfect wood for wooden work. It is subject to low shrinkage and has good stability.

Douglas fir is technically not a true fir abies genus but is in its own genus. 1 1 000 675 180 625 1 500 1 700 000. Engineering properties structural lumber douglas fir larch hem fir spruce pine fir. Lumber weights weights of green kiln dried and pressure treated lumber boards.

Engineering properties of visually graded structural lumber douglas fir larch hem fir spruce pine fir. Visual grading and machine. The wood is also resistant against fungal and insect infestation and exhibits good natural durability when exposed to the elements. Except as otherwise noted the values are computed in accordance with astm standards based on clear wood tests or on tests of full size pieces in specific grades.

Elastic ratios for various wood species at approximately 12 moisture content see bottom of webpage. 1 and better 2 4 thick 1 200 800 180 625 1 550 1 800 000 wwpa no. Modulus of elasticity also referred to as tensile modulus or young s modulus. Machine stress rated msr and machine evaluated mel lumber grading of lumber in north america.

The following table is structural lumber wood engineering properties. It is strong and elastic. Curving grows well on this wood. Properties of lumber products 6 121.

Having the right amount of moisture. This wood native to the pacific. Good strength and practicality. The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood.

Properties the wood of the douglas fir is medium weight and in comparison to other coniferous woods fairly hard. Douglas fir larch select structural 1 500 1 000 180 625 1 700 1 900 000 wclib no. The machine is easy to work with douglas fir wood. Both have the same wood properties although interior douglas fir is less permeable to preservative treatments.

Lumber design values design values provided herein are for western softwood species manufactured and shipped by mills in the 12 contiguous western states and alaska. Civil engineering and design engineering material properties. 2 grade of douglas fir and maximum span floor joists imperial units. Douglas fir is the type of fir most favored by builders of residential and small commercial buildings industrial and multi level structures and bridges.

Douglas fir wood uses. Stress graded structural lumber is produced under two systems. Modulus of elasticity of wood wood engineering design data. Maximum floor joist span no.