Dimensions and humidity

Humidity of the wood: 9%+-2%

Parquet floor: thickness: 22 mm width: 60/70 mm length: 240-500 mm

Plank floor: thickness: 20/22 mm width: 100-190 mm length: 900-2000 mm

Dimension tolerance: +-0,2 mm

Quality of the parquet flooring

General rules

Due to unavoidable differences during sorting up to 2% of wooden flooring of lower quality is acceptable (in according to DIN 280 paragraph 4.1). The quality is estimated according to the defects that occur on the right side. Grinning of the wood and the annual rings as well as knags less than 3 mm not to be taken into account. The core is acceptable on the left side. Advanced decay is not acceptable. Incipient decay is acceptable on the left side as belts of maximal depth of 5 mm and covering maximum of 10% of the total surface (excluding class Natur). All defects not mentioned in clause 3.2. or those which occur on larger scale are accepted on the left side.

Detailed requirements - acceptable wood defects

Oak parquet grading:

(according to class O – quality norm PN-EN 13226:2004)

  • no defects straight grained wood(straight annual rings)

(according to class O – quality norm PN-EN 13226:2004)

  • no defects natural color of wood

(according to class r – quality norm PN-EN 13226:2004)

  • sound knots, set, not larger than10 mm
  • partially decay knots, set, not larger than 5 mm
  • no sapwood
  • unnatural discolorations
  • shallow superficial cracks, not longer than 15 mm
  • sporadic front cracks, single, not longer than 5 mm, affecting the right(upper) side

(according to class r – quality norm PN-EN 13226:2004)

  • sapwood, no more than 50% of the right side
  •  sporadic sound knots, light, do not contrast with natural color of the wood, not larger than 5 mm varied wood color,
  • natural discolorations -  sporadic
  • superficial cracks, not deeper than 1 mm, not longer 20 mm

Grade 3
(according to class o – quality norm PN-EN 13226:2004)

  • sapwood
  • unnatural discolorations
  •  shallow superficial cracks, not larger than 30 mm
  •  front cracks, not longer than 10 mm
  •  sporadic sound knots, set, not larger than 15 mm
  •  sporadic decay knots, single, not larger than 10 mm
  •  sporadic worm holes

Oak parquet unclassified
(according “free class” – quality norm PN-EN 13226:2004)

  • all wood characteristics in any size or number (allowing to use at least 70% of the material) are acceptable
  • material provides ( is characterized with ) required durability of wooden flooring dimensional tolerance 10%
  •  sapwood – acceptable
  •  knots (sound, set, decay) – acceptable
  • yellow tint – acceptable
  • superficial cracks – acceptable
  • oblique fiber course – acceptable
  • sound heartwood (core) – acceptable
  • unnatural discoloration biodegradation sporadic front cracks not longer than 10 mm affecting the right side

The range of acceptable manufacturing defects:

right side: wavy finish not deeper than 0,3 mm; left plane: wood decrements up to 2 mm deep, width up to 5 mm and up to the 1/3 of the flooring unit length; sides: decrements and pulled grains up to 0,3 mm; fronts: the aberration of the axis of symmetry up to 0,5 % of the unit' s total width;

Tongues and grooves must ensure proper contact of the flooring units when laid on floors in order to prevent from slits in the surface.


The parquet needs to be stored in a dry, well-ventilated place not exposed to the sun. The packages should be isolated from the ground.


The parquet needs to be transported by covered means of transport. The packages should be secured to prevent any damage.


All suggestions concerning quality or humidity of wooden flooring should take place before installation. Any complaints about installed parquet will not be taken into consideration.