Larch
Larch
Larix decidua
Other names: European Larch
General description
Larch is a typical tree found in the Alp mountains in Central Europe with a straight trunk. It grows to a height of about 40 m with diameters ranging from 40 – 70 cm.
Wood description
Sapwood is thin, from 1 to 3 cm and yellow. The clearly demarcated heartwood is light brown to dark red brown and can vary largely, depending on origin and growth conditions. The texture is fine to medium according to growing speed.
The resin canals are smaller than in Pine, but do occur as often.
Softwood shows medium to high density and very good strength properties. Gluing properties are good, if the wood is technically dried, but due to resins it can be more difficult, if the wood is not dried. Sawing properties are good, but due to resin clogging of saw blades may occur. Nailing and screwing properties are good, but pre-boring is necessary.
Common uses
Larch is used for heavy carpentry, exterior paneling, exterior and interior joinery and also for flooring.
| Physical characteristics | |
|---|---|
| Density (at 12 % moisture content) | 583 kg⁄m3 |
| Total longitudinal shrinkage | 0.3 % |
| Total radial shrinkage | 3.3 % |
| Total tangential shrinkage | 7.8 % |
| Equilibrium moisture content | |
| (20° C⁄ 37 % rel. humidity) | 8.4 % |
| (20° C⁄ 83 % rel. humidity) | 17.1 % |
| Mechanical characteristics | |
| Modulus of elasticity under bending | 13800 N⁄mm2 |
| Modulus of rupture under bending | 99 N⁄mm2 |
| Tension strength | 107 N⁄mm2 |
| Compression strength | 55 N⁄mm2 |
| Brinell hardness perpendicular to the fibres | 19 N⁄mm2 |
| Janka Hardness | 2,5 kN |
| Nail withdrawal strength in N per mm depth and mm diameter | 12 N⁄mm2 |
| Natural durability and treatability (according to en 350-2) | |
| Fungi | Class 3 – 4 moderately to poorly durable |
| Dry wood borers | durable |
| Termites | Class S susceptible |
| Treatability | 4 – not permeable |
Natural durability is based on mature heartwood. Sapwood must always be considered as non durable against wood destroying agents.



