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Plank parquet

“Art Parquet Co.” manufactures parquet of the trade mark:

Basic Concepts:

According to the National standard 862.1-85 «Parquet product. Plank flooring. Specifications» plank flooring consists of floor planks t&g.

Floor plank is a detail of massive wood with tongues and grooves, by means of which it is linked with the similar plank during the installation.

Tongue is a protruding part of the floor plank linking the adjacent planks during the installation.

Groove is a hollow at the lateral and face edges of the floor plank, in which the tongue enters for the linking adjacent plank.

Wear layer is the top layer of the floor plank from the face side till the top part of the tongue or groove, whose wear determines the term of parquet flooring covering life.

Face side of the floor plank is the outer side of wear layer; backside is the side opposite the face side.

The right floor plank is the plank with the tongue on the right side (if you look at the face side), and with the tongue on the longitudinal edge (if you look from the watcher's side).

 

Main Requirements:

To grant the top quality level of ready-made plank flooring, not absolute dimensions of floor planks (length, width, thickness) are important, but, first of all the humidity index and admittance on their deviations from the nominal.

According to the National standard 862.1-85 maximum plank’s length deviation is ± 0,3 mm; width and thickness deviation is ± 0,2 mm; the tongue is 1 mm shorter than the depth of the groove, and admittance on their dimensions should be - 0.3 mm and + 0.3 mm (i. e. the tongue should never run into the face side of the groove). Maximum deviation from perpendicularity of adjacent edges composes 0.2 mm at the distance of 100 mm from the corner and is checked by the set square and probes.

Maximum deviations from planks’ flatness:

• Longitudinal — 0.6 mm at the length 1000 mm;
• Diametrical — 0.2 mm (not depending from plank width)

Maximum humidity: 9% ± 3% , i. e. from 6 till 12%.

 

Plank parquet selection according to its appearance and processing quality

As a rule, plank flooring is selected according to a certain set of parameters and to its appearance: presence or absence of knots, sapwood, color variation, sawn: flat, quarter/semi quarter (or as in russian — radial and tangential), etc.

According to the National standard 862.1-85, depending on the quality level, wood grades and processing, floor planks are subdivided into two grades: A (the highest category of quality) and B (the first category of quality).

	Radial — premium parquet (A category GOST 862.1-85) of radial (quarter/semi quarter) sawn only (the cut passes through the trunk’s radius or 60 degrees perpendicularly to the axis). It has an even structure. Medullar rays (marble) are present. Wood and mechanical defects are not acceptable.
	Radial Select — selected premium parquet (A grade GOST 862.1-85) of radial (quarter/semi quarter) sawn only (the cut passes through the trunk’s radius or 60 degrees perpendicularly to the axis. It has an even structure and even color tone (variation is possible but no more than 10%). Medullar rays (marble) are not acceptable. Wood and mechanical defects are not acceptable.
	Tangential — premium parquet of tangential (flat) sawn (A grade GOST 862.1-85) (the cut passes at the distance from the medullar or tangent to the annual layer of the trunk). It has live and rich structure, which is formed by annual layers crossing due to the trunk’s tapering. Wood and mechanical defects are not acceptable. Medullar rays are almost unseen.
	Standard — premium parquet (A grade GOST 862.1-85) without selection to the sawn. Sapwood, knots and mechanical defects are not accepted.
	Natural — parquet without selection to the sawn, having natural wood pattern. Sapwood is acceptable, but no more than 25%. Knots are acceptable, but no more than 3 and up to 3mm in diameter at the face side. The pitch of grains and wood veins are acceptable. Mechanical defects are not acceptable.
	Rustic — parquet without selection to the sawn corresponding to the 1 category of quality (B grade of the National standard 862.1-85). Big light and dark knots more than 3 mm in diameter but no more than 3 at the face side are acceptable. Sapwood and the pitch of grains are acceptable. Cracks not yielding onto the face side, and mechanical defects (no more than 1.5 mm in depth) are acceptable.

 

The comparative table of selection criteria

Direction of wood grains at the face side
Radial Select	Significant deviation from the longitudinal axis is not acceptable (no more than 10 mm at the plank width)
Radial Natural	Mainly longitudinal direction of grains. Some deviations from the longitudinal axis are acceptable.
Tangential	Is not under consideration. The cut passes through the trunk’s radius or 60 degrees perpendicularly to the axis
Standard	Is not under consideration
Natural	Is not under consideration
Rustic	Is not under consideration

Live light, dark and accrete knots
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	No more than 2 knots on the plank are acceptable: light knots– up to 5 mm in diameter, dark  knots– up to 3 mm.
Rustic	Light knots — up to 10 mm, dark knots — up to 5 mm are acceptable

The same. Partially accrete knots
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Are not acceptable
Rustic	Light knots — up to 10 mm , dark knots — up to 5 mm are acceptable

The same, but not accrete knots
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Are not acceptable
Rustic	Are not acceptable

Eyes
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Sole light and dark eyes up to 5 mm are acceptable
Rustic	Are not under consideration

Sapwood
Radial Select	Is not acceptable
Radial natural	Is not acceptable
Tangential	Is not acceptable
Standard	Is not acceptable
Natural	Insignificant, no more than 1/5 of corresponding length or width of the plank is acceptable
Rustic	Is not under consideration

The heart
Radial Select	Is not acceptable
Radial natural	Up to 40—45% is acceptable
Tangential	Is not acceptable
Standard	Is not acceptable
Natural	Up to 40—45% is acceptable
Rustic	Up to 40—50% is acceptable

Spots
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Small spots are acceptable
Rustic	Are not under consideration

Wormholes at the face side
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Are not acceptable
Rustic	Are not under consideration

Splits, cracks, chips, etc.
Radial Select	Are not acceptable
Radial natural	Are not acceptable
Tangential	Are not acceptable
Standard	Are not acceptable
Natural	Are not acceptable
Rustic	Are not acceptable

Undermilling
Radial Select	Is not acceptable
Radial natural	Is not acceptable
Tangential	Is not acceptable
Standard	Is not acceptable
Natural	Is not acceptable
Rustic	Is not acceptable

 

Note: According to geometrical parameters and humidity, floor planks are not subdivided into the grades. They either correspond to the standard or not, i.e. they are considered to be defective.

We produce under the order.