Wood Species
Duobalken® and Triobalken®beams are made of spruce wood as standard. However, it can also be supplied in fir, pine, larch and Douglas fir as well on request. The use of other species of softwood is also permitted for the production of Duobalken® and Triobalken®beams according to DIN 1052:2008, Annex H.2 (3), but is not usual.
| Color, grain pattern | Yellowish-white, darkens to yellowish-brown, develops distinctive grain patterns in both the sapwood and the heartwood |
| Density (kg/cbm) | (330) - 470 - (680) |
| Durability | Resistance class 4 in accordance with DIN 6836 |
| Resistance | Moderate shrinkage. Long moisture-change times, generally good resistance after drying. |
| Special characteristics | Most common softwood in central Europe |
| Color, grain pattern | Yellowish-white to almost white, develops distinctive grain patterns, without heartwood coloring |
| Density (kg/cbm) | (350) - 450 - (750) |
| Durability | Resistance class 4 in accordance with DIN 6836 |
| Resistance | Moderate shrinkage. Long moisture-change times. |
| Special characteristics | Fresh, fir-specific scent, which disappears as it dries; wetwood formation |
| Color, grain pattern | Develops pronounced dark-colored heartwood, yellowish-white to reddish-white sapwood, reddish-yellow heartwood, darkening to reddish-brown, decorative |
| Density (kg/cbm) | (330) - 520 - (890) |
| Durability | Resistance class 3-4 in accordance with DIN 6836 |
| Resistance | Low shrinkage, good resistance |
| Special characteristics | High risk of sap stain, easy to impregnate sapwood, high resin content makes processing and surface treatment more difficult |
| Color, grain pattern | Develops pronounced dark-colored heartwood, light-yellow to reddish-yellow sapwood, ruddy-red heartwood, darkening to intensive reddish-brown, decorative |
| Density (kg/cbm) | (440) - 590 - (850) heaviest domestic softwood |
| Durability | Resistance class 3 in accordance with DIN 6836 |
| Resistance | Propensity for cracking |
| Special characteristics | Relatively resistant to acid |
| Color, grain pattern | Develops pronounced dark-colored heartwood, white to yellowish-gray, light-yellowish-brown to reddish-brown heartwood, pronounced darkening in the light, decorative |
| Density (kg/cbm) | (500) - 650 - (700) |
| Durability | Resistance class 3 in accordance with DIN 6836 |
| Resistance | Good resistance, low shrinkage |
| Special characteristics | Hard, rather brittle softwood |