Wood species

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Douglas Fir

Botanical name

Pseudotsuga menziesii

Origin

North America

Other names

Douglasie, Pin d'oregon, Douglas, Sapin De Douglas

Notes

Coming from North West of America, DOUGLAS FIR is often used for reaforestation in France and in Europe. Properties of european planted trees (young and with a rapid growth)which are mentioned in this sheet are different from those of the "Oregon pine" (old and with a slow growth) coming from its original growing area.

WOOD DESCRIPTION

Color:	pinkish brown
Sapwood:	clearly demarcated
Texture:	medium
Grain:	straight
Interlocked grain:	absent
Note:	Heartwood is pinkish brown with veins, the large sapwood is yellowish. Wood may show some resin pockets, sometimes of a great dimension.

PHYSICAL, MECHANICAL AND ACOUSTIC PROPERTIES

	Mean	Std dev.
Specific gravity *:	0,54	0,04
Monnin hardness *:	3,2	0,8
Coeff. of volumetric shrinkage:	0,46%	0,02%
Total tangential shrinkage (TS):	6,9%	1,2%
Total radial shrinkage (RS):	4,7%	0,4%
TS/RS ratio:	1,5
Fiber saturation point:	27%
Stability:	moderately stable

	Mean	Std dev.
Crushing strength*:	50 MPa	6 MPa
Static bending strength*:	91 MPa	6 MPa
Modulus of elasticity*:	16800 MPa	1550 MPa

(*: at 12% moisture content, with 1 MPa = 1 N/mm²)

Musical quality factor: 110,1 measured at 2971 Hz

NATURAL DURABILITY AND TREATABILITY

Funghi (according to E.N. standards):	class 3-4 - moderately to poorly durable
Dry wood borers:	durable - sapwood demarcated (risk limited to sapwood)
Termites (according to E.N. standards):	class S - susceptible
Treatability (according to E.N. standards):	class 4 - not permeable
Use class ensured by natural durability:	class 3 - not in ground contact, outside
Species covering the use class 5:	No
Note:	This species is listed in the European standard NF EN 350-2. Use class 3 is only for wood components without sapwood. According to the European standard NF EN 335, performance length might be modified by the intensity of end-use exposition. Heartwood is not permeable to preservative products. Wood is used most of the time with sapwood which is moderately to poorely permeable to preservative products.

SAWING, MACHINING AND ASSEMBLING

Blunting effect:	normal
Sawteeth recommended:	ordinary or alloy steel
Cutting tools:	ordinary
Peeling:	good
Slicing:	nood
Note:	Risks of clogging of saw blades and tools due to resin pockets.
Nailing / screwing:	good
Gluing:	correct
Note:	Slightly acid wood: risk of nail or screw corrosion if in contact with humidity.

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