Douglas Fir Lumber Properties

Engineering properties structural lumber douglas fir larch hem fir spruce pine fir.

Douglas fir lumber properties. Good strength and practicality. Douglas fir wood uses. Douglas fir timber properties. 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.

Machine stress rated msr and machine evaluated mel lumber grading of lumber in north america. Both have the same wood properties although interior douglas fir is less permeable to preservative treatments. Coastal douglas fir is a much bigger tree than the interior species and it is generally lighter in colour with a more uniform texture. Properties of lumber products 6 121.

Lumber weights weights of green kiln dried and pressure treated lumber boards. Visual grading and machine. 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. Modulus of elasticity of wood wood engineering design data.

The following table is structural lumber wood engineering properties. Maximum floor joist span no. 1 1 000 675 180 625 1 500 1 700 000. Douglas fir is technically not a true fir abies genus but is in its own genus.

This wood native to the pacific. Central city surrey photo credit. It is subject to low shrinkage and has good stability. The wood is also resistant against fungal and insect infestation and exhibits good natural durability when exposed to the elements.

Related lumber wood engineering data. The machine is easy to work with douglas fir wood. Having the right amount of moisture. Stress graded structural lumber is produced under two systems.

Curving grows well on this wood. Modulus of elasticity also referred to as tensile modulus or young s modulus. Properties of lumber products by roland hernandez and david w. As we know douglas fir wood is the perfect wood for wooden work.

Civil engineering and design engineering material properties. 2 grade of douglas fir and maximum span floor joists imperial units. 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.

Douglas fir is the type of fir most favored by builders of residential and small commercial buildings industrial and multi level structures and bridges. 1 and better 2 4 thick 1 200 800 180 625 1 550 1 800 000 wwpa no. Excellent screw and nail holding. The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood.