Douglas Fir Lumber Properties

Maximum floor joist span no.

Douglas fir lumber properties.

Modulus of elasticity of wood wood engineering design data. Elastic ratios for various wood species at approximately 12 moisture content see bottom of webpage. Visual grading and machine. 1 and better 2 4 thick 1 200 800 180 625 1 550 1 800 000 wwpa no.

2 grade of douglas fir and maximum span floor joists imperial units. The following table is structural lumber wood engineering properties. Douglas fir is technically not a true fir abies genus but is in its own genus. Coastal douglas fir is a much bigger tree than the interior species and it is generally lighter in colour with a more uniform texture.

The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood. Engineering properties of visually graded structural lumber douglas fir larch hem fir spruce pine fir. Central city surrey photo credit. Machine stress rated msr and machine evaluated mel lumber grading of lumber in north america.

Douglas fir wood uses. Properties of lumber products by roland hernandez and david w. Engineering properties structural lumber douglas fir larch hem fir spruce pine fir. Stress graded structural lumber is produced under two systems.

Good strength and practicality. Excellent screw and nail holding. Civil engineering and design engineering material properties. Modulus of elasticity also referred to as tensile modulus or young s modulus.

As we know douglas fir wood is the perfect wood for wooden work. Having the right amount of moisture. 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. Douglas fir is the type of fir most favored by builders of residential and small commercial buildings industrial and multi level structures and bridges.

Properties of lumber products 6 121. The wood is also resistant against fungal and insect infestation and exhibits good natural durability when exposed to the elements. It is strong and elastic. Douglas fir larch select structural 1 500 1 000 180 625 1 700 1 900 000 wclib no.

It is subject to low shrinkage and has good stability. The machine is easy to work with douglas fir wood. Curving grows well on this wood. 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.

This wood native to the pacific. Douglas fir timber properties. Lumber weights weights of green kiln dried and pressure treated lumber boards. Properties the wood of the douglas fir is medium weight and in comparison to other coniferous woods fairly hard.