Douglas Fir Lumber Properties

Machine stress rated msr and machine evaluated mel lumber grading of lumber in north america.

Douglas fir lumber properties.

Properties the wood of the douglas fir is medium weight and in comparison to other coniferous woods fairly hard. Engineering properties of visually graded structural lumber douglas fir larch hem fir spruce pine fir. Modulus of elasticity of wood wood engineering design data. Central city surrey photo credit.

The machine is easy to work with douglas fir wood. Having the right amount of moisture. 2 grade of douglas fir and maximum span floor joists imperial units. Civil engineering and design engineering material properties.

The wood is also resistant against fungal and insect infestation and exhibits good natural durability when exposed to the elements. Stress graded structural lumber is produced under two systems. It is subject to low shrinkage and has good stability. As we know douglas fir wood is the perfect wood for wooden work.

The tree itself grows to be very large and yields a large amount of usable lumber and veneer for plywood. It is strong and elastic. Properties of lumber products 6 121. Good strength and practicality.

Lumber weights weights of green kiln dried and pressure treated lumber boards. This wood native to the pacific. Coastal douglas fir is a much bigger tree than the interior species and it is generally lighter in colour with a more uniform texture. Maximum floor joist span no.

Douglas fir timber properties. 1 1 000 675 180 625 1 500 1 700 000. Modulus of elasticity also referred to as tensile modulus or young s modulus. Both have the same wood properties although interior douglas fir is less permeable to preservative treatments.

Curving grows well on this wood. Elastic ratios for various wood species at approximately 12 moisture content see bottom of webpage. Engineering properties structural lumber douglas fir larch hem fir spruce pine fir. Douglas fir is the type of fir most favored by builders of residential and small commercial buildings industrial and multi level structures and bridges.

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. 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. 1 and better 2 4 thick 1 200 800 180 625 1 550 1 800 000 wwpa no.

Douglas fir wood uses. Properties of lumber products by roland hernandez and david w. Excellent screw and nail holding. Visual grading and machine.