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Unedged planks for further processing
Plank floor

Bohle , sometimes also plank, as well as post in Austria , is the name for an elongated sawn timber with a flat cross-section. Length and width dimensions correspond to a (wooden) board . However, a plank is thicker.

Standard formats

  • According to DIN 68252 (sawn timber in general), which has a thickness of at least 40 mm and a width of at least twice the thickness.
  • In contrast to this, the DIN 4074 standard (lumber for building construction) which is valid for the building industry defines the width as at least three times the thickness.
  • In Austria, posts are pieces of wood with a rectangular cross-section, thicker than a board (according to the standard, which in Austria is a maximum of 35 mm thick). By definition, a post has a thickness of at least 40 mm and a maximum of 100 mm rough sawn with a width of ≥18 cm. Planed posts can also be only 35 mm thick.

Colloquially, floorboards are also called planks.


Planks are used because of their greater rigidity compared to boards:

  • in construction as a walking surface on scaffolding ( Austrian scaffolding posts ), according to the standard of special wood quality, with chamfered corners and often with metal end pieces ( shoes ) for hanging and as splice protection;
  • as bedding for heavy machinery, guns and the like;
  • as scaffolding wood (aids in technical assistance or on construction sites) or for temporary small bridges (e.g. for loading a truck with a wheelbarrow).

Planks are especially used by joiners and carpenters . They are often used in shipbuilding (see plank ), timber construction as well as in construction site equipment and for (temporary) traffic structures :

Mainly the conifers spruce , fir and larch are processed into posts; Usual sales lengths are 300 to 500 cm.


A base board is a shorter board that is often slightly rounded on one side. The ends or only the corners can be protected from wear and fraying with metal fittings ( plank protection ). Alternatively, corrugated irons can be hammered into the end grain to prevent cracks from developing at the ends.

Base planks prevent them from sinking into soft ground, for example from stuck vehicles or when using jacks and lifting bags .

Wedge plank

A wedge plank is wood that has been cut at an angle in cross section. Wedge planks are used, among other things, as eaves or end boards for roofing . Typically, they taper from 5 or 6 cm to 2 cm.

Norms and standards

  • DIN 4074-1 (2003-06) Sorting wood according to load-bearing capacity - Part 1: Softwood lumber.
  • DIN 4074-5 (2003-06) Sorting wood according to load-bearing capacity - Part 5: Hardwood lumber .
    is also binding for Austria as ÖNORM DIN 4074-x
  • DIN 68252-1 Terms for sawn timber, shape and dimensions.