Expert knowledge

** Squared timber** is a solid sawn timber or construction timber obtained by sawing tree trunks along the trunk axis. It is square timber with a rectangular cross-section and a thickness-width ratio of no more than 1:3.

Two standards are decisive for the minimum thickness: squared timber must be at least 6 cm thick as sawn timber, at **least 4 cm** thick as **construction sawn timber with a defined load-bearing capacity**.

The strongest and most stable square timber after wooden beams is characterised by high load-bearing capacity and load-bearing capacity. Squared timber can be used in various ways, for example as ceiling beams, rafters or in combination with other square timber as part of trusses.

The weight of a squared timber depends on three factors: the type of wood, the volume and the moisture content of the wood. A typical spruce squared timber with dimensions of 3,000 x 80 x 80 mm and 20 percent moisture (air-dry), for example, weighs around 8.8 kg.

The designation of individual formats of coniferous timber is defined in **DIN 4074-1**:

**Squared timber**: d ≥ 40mm, b ≤ 3 * d- Screed: d ≥ 40mm, b ≥ 3 * d
- Board: d ≤ 40mm, b ≥ 80mm
- Slath: d ≤ 40mm, b < 80mm

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