Spruce
Spruce
Picea abies
Other names: Whitewood, Norway spruce
General description
The species is widely distributed throughout continental Europe and is a timber tree of major economic importance. The large tree usually has a straight, cylindrical trunk and grows to a height of about 30 m (up to 55 m), with a large diameter of about 60 cm (up to 1,5 m).
Wood description
The colours range from creamy white to light yellow and to red-brown. Heartwood is not distinct from sapwood. Spruce is straight-grained with thin and regular texture. Resin canals are rather common. The wood is soft, low in weight and has medium density. The strength properties are good.
Sawing and machining is easy, also assembling. Spruce has a slight tendency to split when nailed.
Common uses
The typical end-uses for spruce wood are for structural end uses, indoors and outdoors, thus it is the most important building and construction timber in Europe. It is also used for decorative plywood, decorative veneer, domestic flooring, factory flooring, general carpentry, interior construction, joinery (external). Spruce wood from Central and Eastern Europe shows exceptional resonance qualities and is used for musical instruments like sound boards of pianos and bellies of violins and guitars.
| Physical characteristics | |
|---|---|
| Density (at 12 % moisture content) | 441 kg⁄m3 |
| Total longitudinal shrinkage | 0.3 % |
| Total radial shrinkage | 3.6 % |
| Total tangential shrinkage | 7.8 % |
| Equilibrium moisture content | |
| (20° C⁄ 37 % rel. humidity) | 7.0 % |
| (20° C⁄ 83 % rel. humidity) | 16.4 % |
| Mechanical characteristics | |
| Modulus of elasticity under bending | 12500 N⁄mm2 |
| Modulus of rupture under bending | 77 N⁄mm2 |
| Tension strength | 95 N⁄mm2 |
| Compression strength | 44 N⁄mm2 |
| Brinell hardness perpendicular to the fibres | 44 N⁄mm2 |
| Janka Hardness | 1.6 kN |
| Nail withdrawal strength in N per mm depth and mm diameter | 5.5 N⁄mm2 |
| Natural durability and treatability (according to en 350-2) | |
| Fungi | Class 4 –poorly durable |
| Dry wood borers | susceptible |
| Termites | Class S susceptible |
| Treatability | 3-4 poorly or not permeable |
Natural durability is based on mature heartwood. Sapwood must always be considered as non durable against wood destroying agents.



