GOST: softwood lumber, board sizes. GOST: softwood lumber, board sizes Main parameters and dimensions

INTERSTATE STANDARD

SOFTWOOD TIMBER

TECHNICAL CONDITIONS

Official publication

Standardinform

UDC 634.984.4:674.032:006.354

Group K21

INTERSTATE STANDARD

SOFTWOOD TIMBER

Specifications

Coniferous sawn timber. Specifications

MKS 79.040 OKP 53 3100

Date of introduction 01/01/88

This standard applies to lumber coniferous species and installs technical requirements to lumber intended for use in national economy and export.

The standard does not apply to resonance and aircraft lumber.

(Changed edition, Amendment No. 3).

1. MAIN PARAMETERS AND DIMENSIONS

1.1. Lumber is divided into edged, unedged, boards, beams and beams.

Terms and definitions - according to GOST 18288.

1.2. Nominal dimensions of lumber and maximum deviations from nominal dimensions are in accordance with GOST 24454.

By agreement with the consumer, lumber with gradations in length, size and permissible deviations established in GOST 9302 and GOST 26002 are allowed for the domestic market.

(Changed edition, Amendment No. 2).

1.3. Symbol should consist of the name of the lumber (board, block, timber), a number indicating the grade, the name of the wood species (coniferous or individual species - pine, spruce, larch, cedar, fir), a digital designation of the cross section (for unedged lumber - thickness) and designations of this standard.

Examples of symbols:

Board -2- pine - 32x 100- GOST 8486-86 Board - 2 xv.- 32- GOST 8486-86

2. TECHNICAL REQUIREMENTS

2.1. Lumber must meet the requirements of this standard and be made from the following wood species: pine, fir, larch and cedar.

2.2. Based on the quality of wood and processing, boards and bars are divided into five grades (selected, 1, 2, 3, 4th), and beams - into four grades (1, 2, 3, 4th) and must meet the requirements specified in table.

The purpose of various types of lumber is given in the appendix.

(Changed edition, Amendment No. 1, 3).

2.3. Sawn timber of selected, 1st, 2nd, 3rd grades is produced dry (with a moisture content of no more than 22%), raw (with a moisture content of more than 22%) and raw antiseptic. During the period from May 1 to October 1, the production of raw antiseptic and raw lumber is allowed by agreement with the consumer (customer).

The moisture content of grade 4 lumber is not standardized.

Antiseptic treatment - according to GOST 10950.

2.4. The quality assessment of lumber, with the exception of deck timber, should be made according to the layer or edge that is worst for a given board, and for square beams and beams - according to the worst side.

Official publication

Reproduction is prohibited

© Standards Publishing House, 1986 © Standartinform, 2007

2.5. The surface roughness parameter of Yat tah lumber should not exceed 1250 microns for selected, 1st, 2nd and 3rd grades, and for the 4th grade - 1600 microns according to GOST 7016.

2.4, 2.5. (Changed edition, Amendment No. 3).

2.6. Non-parallelism of faces and edges in edged lumber, as well as faces in unedged lumber, is allowed within the limits of deviations from the nominal dimensions established by GOST 24454.

2.7. Additional requirements for lumber intended for special shipbuilding

Norms for limiting vices

flat length on each side, no more than:

1.1. The fused healthy ones, and in the bars both partially fused and non-fused healthy:

Note. The number of knots in beams is not standardized.

1.2. Partially fused - Allowed in the total number of fused healthy knots measuring in fractions of the width of the fused and unfused sides and in quantity on any one-meter section of length on each side, not

The wood surrounding the tobacco knots should not show signs of rot.

Notes:

1. Knots less than half the maximum allowed size are not taken into account.

2. In lumber with a thickness of 40 mm or more (with the exception of selected grades), oblong and stitched knots with a minor axis size of up to 6 mm and a depth of up to 3 mm are allowed without limiting the size along the major axis.

3. The stepson is allowed according to the norms of unfused knots. Not allowed in selected variety.

4. The size of a knot is determined by the distance between the tangents to the contour of the knot, drawn parallel to the longitudinal axis of the lumber. The size of an oblong and stitched knot on the faces of lumber and on all sides of the beams and beams is taken to be half the distance between the tangents drawn parallel to the longitudinal axis of the lumber.

5. In lumber longer than 3 m, it is allowed to have one knot of the size specified in the standards of the adjacent lower grade.

6. On a section of lumber with a length equal to its width, the largest sum of the sizes of knots lying on a straight line intersecting the knots in any direction should not exceed size limit allowed knots.

Continuation

Defects of wood according to GOST 2140

In lumber for load-bearing structures, the sum of the sizes of all knots located in a section 200 mm long should not exceed the maximum size of permissible knots

2. Cracks

2.1. Face and edge, including those facing the end

2.2. Plate through, including those facing the end

2.3. Face (except for shrinkage cracks)

Allowed lengths in fractions of the length of lumber, no more: Shallow Shallow and deep

V 6 I U 4 Knot

Deep

Uyu I U6

Allowed length in mm, no more:

U 2

Allowed provided that the integrity of the lumber is maintained

Not allowed

Allowed total length in fractions of the length of lumber, not more than:

Ub

at 4

Allowed at one end length in shares Allowed width of lumber, no more: subject to

storage whole-

U.

Uz

U 2

lumber density

Note. The permissible crack sizes are established for lumber with a wood moisture content of no more than 22%; at higher humidity, these crack sizes are halved.

3. Defects in the structure of wood

3.1. Fiber inclination

3.3. Pockets

No more than 5% is allowed

Not allowed

3.4. Double core

Single-sided on any one-meter length section are allowed in the amount of 1 piece. no more than 50 mm long

Not allowed

3.5. Sprouting

Not allowed

No more than 20% of the area of ​​the lumber face is allowed

Allowed on any one-meter length of lumber in pieces, no more

Allowed

Allowed

Allowed

U zo

Not allowed

Allowed Allowed

without peeling and radial cracks only in lumber with a thickness of 40 mm or more

Allowed one-sided width in shares of the corresponding side of the lumber, not more than:

У,0 I Vs I V 4

and length in fractions of the length of lumber, no more:

Uyu I Uyu

Allowed to extend in fractions of the length of lumber up to

Vs I Uz

but not more than 1 m

Allowed

Allowed

Continuation

Notes:

1. Bark on wane of export lumber is not allowed.

2. Edged lumber that meets the requirements of a certain grade in all respects, but with wane exceeding the established norm for this grade, is allowed to be converted to unedged lumber while maintaining the grade.

6.3. Bevel cut

In lumber, one end (in export lumber, both ends) must be sawn perpendicular to the longitudinal axis of the lumber. Deviation from the perpendicularity of the end to the face and except is allowed up to 5% of the width and thickness of the lumber, respectively.

6.4. Risks, food, breakout

Allowed within the limits of deviations from the nominal dimensions established in GOST 24454

Allowed with a depth of no more than 3 mm

Allowed

Continuation

Note. In unedged lumber, longitudinal warping along the edge is not standardized.

7.2. Warping Allowed arrow deflection in fractions of the width of the lumber in%, Allowed transverse no more than:

1 I 1 I 1 I 2

Notes:

1. Warp standards are established for lumber with a moisture content of no more than 22%. With higher humidity, these norms are halved.

2. Wood defects not mentioned in this standard are allowed.

2.7.1. Lumber for plating parts and connections of sea boats, boats of seagoing vessels, gliders, high-speed lake and river boats and sports vessels of the 1st class must meet the requirements of selected grade with the following additions:

the core part in the middle of the length of the lumber should be on the inner layer: in the longitudinal cladding - at least 50%, in the diagonal - at least 25% of the width of the layer;

the dimensions of the fused, partially fused and unfused knots taken into account should not exceed 10 mm;

the number of fused knots taken into account should not exceed 1 piece. on any one-meter length of lumber, and partially fused, unfused - 1 piece. per 2 m length of lumber;

the knots taken into account are allowed no closer than 10 mm from the edges of the lumber; pockets on the outer layer of lumber are not allowed.

2.7.2. Lumber for decking sea ​​vessels shall meet the requirements of select and first grades for external decks and first and second grades for internal decks with the following additions:

on the best faces of lumber with a width of up to 100 mm inclusive, intended for external decks, the sapwood part is allowed to be no more than 30 mm wide, and the surfaces of the faces must be sawn radially or close to it (without wedge cuts of annual layers);

the knots taken into account are allowed: fused - no closer than 10 mm, partially fused and unfused - no closer than 15 mm from the ribs of the outer face;

on the worst face and the lower halves of the edge area of ​​lumber, fused knots are allowed without limitation, and partially fused and unfused knots are allowed up to "/3 of the width of the face;

cracks are allowed in lumber for external decks up to a depth of D 4 thickness; for interior decks - “D thickness of lumber. The length of cracks in deck lumber is not limited;

blunt wane is allowed in deck lumber with a size of no more than 5 mm; cancer on the best faces in the upper halves of the edge area, and pockets on the best face of lumber for external decks are not allowed;

core within the bottom half of deck lumber is permitted. Note. The quality of deck lumber is assessed by the best face and the upper halves of the edge area.

(Changed edition, Amendment No. 1).

2.8. Lumber must be sorted by type of processing into edged and unedged, by size and grade (each grade separately).

At the request of the consumer, lumber can be sorted into groups of grades in accordance with the purposes established in the annex to the standard.

Lumber for export must be sorted in accordance with the purchase order of the foreign trade organization.

2.9. The grade, nature of processing, size and type of wood must be indicated in the consumer specification.

3. ACCEPTANCE RULES AND CONTROL METHODS

3.1. Acceptance rules and control methods - according to GOST 6564.

4, LABELING, TRANSPORTATION AND STORAGE

4.1. Labeling, packaging and transportation of lumber must be carried out in accordance with GOST 6564 and GOST 19041.

Dimensions of transport packages - according to GOST 16369.

4.2. Storage of lumber - in accordance with GOST 3808.1 and GOST 19041.

APPLICATION

Mandatory

Grades (groups of grades) of lumber

Main purposes of lumber

Special shipbuilding - for plating and bracing of sea boats, dinghies, seagoing vessels, gliders, high-speed lake and river boats and 1st class sports vessels, flooring of external and internal decks of sea vessels

Agricultural machinery - for the manufacture of wooden parts of agricultural machines

0, 1,2,3 Carriage manufacturing - for the manufacture of wooden parts for railway carriages

Shipbuilding

Automotive construction - for the production of wooden platform parts trucks, trailers and semi-trailers Motor industry, transport industry

1, 2, 3 Construction and repair and maintenance needs, elements of load-bearing structures

tions, parts of windows and doors, planed parts, parts of wooden houses, etc.

Production of various woodworking products, including furniture, staves for bulk and dry barrels, special containers

3, 4 Containers and packaging

For use on minor parts in construction, cutting into small workpieces for various purposes

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Forestry, Pulp and Paper and Woodworking Industry of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated September 30, 1986 No. 2933

3. INSTEAD GOST 8486-66

4. The standard fully complies with ST SEV 2369-80

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. The validity period was lifted according to Protocol No. 3-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 5-6-93)

7. EDITION (September 2007) with Amendments No. 1, 2, 3, approved in December 1987, September 1988, February 1990 (IUS 3-88, 1-89, 5-90)

Edged boards are a material that is quite common in the construction market. It is produced by a huge number of enterprises. To properly understand this material, it is necessary to study its main characteristics. What is an edged board? It received this name because of the manufacturing method. The log is freed from bark, sawn and uneven edges are removed. That is why the board is “edged”. Any edged log or board may contain wane. Wane is the remnant of irregularities. Let's consider the type of coniferous edged boards according to GOST.

Description of material

Standards have been established that indicate the percentage of wane content to the total area of ​​the edged board. Such irregularities should in no case reduce the performance characteristics of the material.

Usually used if you need to build a temporary building, a change house, usually used for making pallets.

Fourth grade

The number of black spots increases to 6 per meter. Rot is allowed in an amount of 10% of the total area. The wane can be blunt or sharp, warping and winging are also allowed.

According to GOST, the external surface and linear parameters must have the following characteristics:

• the roughness of the ends should be no more than 250 microns, this also applies to the rough side;
• roughness of the front side, as well as longitudinal edges, no more than 40 microns;
• deviation in thickness of 1 linear meter is no more than 0.3 mm;
• in parallelism, the deviation of the edges from the side is no more than 0.3 mm;
• relative humidity or when selling from 12 to 15%.

How many edged boards 50x150x6000 in one cube can be found out from this

Material characteristics

Relative humidity is considered an important indicator. Depending on this, the materials can be:

• raw
• wet.

You can see what a 20x100x6000 edged board looks like

Damp boards made from fresh tree canes that have just been cut. The humidity of such material is 22% or more. Dry boards have a moisture content of 8 to 14%. Despite these parameters, you need to know that wood is a hygroscopic material. Therefore, during storage it can absorb more moisture, the percentage will change.

All scientific characteristics may not be understood by the average person. Therefore, you need to learn to understand and distinguish between certain types of coniferous boards.

Of course, all these methods are not a panacea. After all, sometimes even a professional cannot understand what quality of material he is offered to buy. No one will examine every board. Therefore, try to buy edged softwood boards from the most trusted suppliers. Study and read forums, consult with friends.

You can find out how many edged boards 40x150x6000 are in one cube in this

Dimensions of edged boards

The dimensions of edged boards are measured in millimeters. The width, length and height are determined. Examples of boards: 25 by 150 by 4000 mm, 50 by 200 by 3000 mm. If the height and thickness are the same, then it is already timber. The manufacturer is guided by the GOST application, which lists all acceptable values. But it is worth knowing that any manufacturer can deviate from the norms, making the sizes requested by the customer. To select what you need, you need to know the basic parameters of the product. Today, a length of 6 meters has become the standard. The width of the edged board can be 75, 100, 125, 150 to 275 mm. Material thickness 16, 19, 22.25, 32, 40, 44, 50, 60, 75 mm. Approximate prices are from 6,000 to 8,000 rubles per cubic meter.

Manufacturers

1. Lindexport LLC is a company that began to develop back in 2004. Now the lumber market is developing dynamically and conquering it. The company is located in Belarus, in the Minsk region, or rather 50 km from the highway. They are engaged in logging, woodworking and the production of various lumber. Of course, they also produce edged boards.
   
2. Private unitary enterprise "Khompil"– private enterprise in the woodworking industry. They have been working on the market for about 15 years. They supply their products to Belarusian markets and Western partners. The company produces lumber and assembles wooden containers. The company also engages in carpentry and timber cutting. The enterprise is located 30 km from the city of Brest.
   
3. Lestorg LLC– has been producing lumber for about 14 years. The company works directly with customers. Delivery is carried out anywhere in the world.
   
4. OJSC Sokolsky Woodworking Plant– produces not only lumber, but also produces finished houses. In 2008, 35 thousand square meters were produced.
   
5. AltaiForest LLC- an enterprise that produces lumber from coniferous trees in huge quantities. In the Altai Territory, he has the largest production facility.
   

Edged boards are used in a wide variety of applications. The base of the foundation, which rises 30 cm above the ground, may require formwork. But only if it is not a whole cast block. For subfloors, boards are also used, which are laid on pre-prepared joists. But edged boards can also be used for laying white floors. And hardboard or plywood sheets are laid on top. They are often used for cladding interior rooms. The next layer involves laying laminate or linoleum. Partitions with further cladding are also built from edged boards, which are cheaper. Here you can make thick walls, which can later be insulated, but first leave a distance between the boards.

How many pieces of edged board 25x150x6000 fit in one cube can be found in this

The material can be used in a variety of fields using it various shapes. The most important thing is to know that raw materials made from natural ingredients require special careful care.

It is worth considering that the natural coating should be topcoated with fire-retardant varnishes and anti-bioaging agents.

6. The validity period was lifted according to Protocol No. 3-93 of the Mechanized State Council for Standardization, Metrology and Certification (IUS 5-6-93)

7. EDITION (September 2007) with Amendments No. 1, 2, 3, approved in December 1987, September 1988, February 1990 (IUS 3-88,1-89, 5-90)

Amendment made by database manufacturer

This standard applies to lumber of coniferous species and establishes technical requirements for lumber intended for use in the national economy and export.

The standard does not apply to resonance and aircraft lumber.

(Changed edition, Amendment No. 3)

1. MAIN PARAMETERS AND DIMENSIONS

1.1. Lumber is divided into edged, unedged, boards, beams and beams.

1.2. Nominal dimensions of lumber and maximum deviations from nominal dimensions are in accordance with GOST 24454.

By agreement with the consumer, lumber with gradations in length, size and permissible deviations established in GOST 9302 and GOST 26002 are allowed for the domestic market.

(Changed edition, Amendment No. 2).

1.3. The symbol must consist of the name of the lumber (board, block, timber), a number indicating the grade, the name of the wood species (softwood - coniferous or individual species - pine, spruce, larch, cedar, fir), digital designation of the cross section (for unedged lumber - thickness) and designations of this standard.

Examples of symbols:

Board - 2 - pine - 32x100 - GOST 8486-86

Board - 2 pieces - 32 - GOST 8486-86

2. TECHNICAL REQUIREMENTS

2.1. Lumber must meet the requirements of this standard and be made from the following wood species: pine, spruce, fir, larch and cedar.

2.4. The quality assessment of lumber, with the exception of deck timber, should be made on the face or edge that is the worst for a given board, and for square beams and beams - on the worst side.

2.5. The surface roughness parameter of lumber should not exceed 1250 microns for selected, 1st, 2nd and 3rd grades, and for 4th grade - 1600 microns according to GOST 7016.

2.4, 2.5. (Changed edition, Amendment No. 3).

2.6. Non-parallelism of faces and edges in edged lumber, as well as faces in unedged lumber, is allowed within the limits of deviations from the nominal dimensions established by GOST 24454.

2.7. Additional requirements for lumber intended for special shipbuilding

Norms for limiting vices

Notes:

1. Knots less than half the maximum allowed size are not taken into account.

2. In lumber with a thickness of 40 mm or more (with the exception of selected grades), oblong and stitched knots with a size along the minor axis of up to 6 mm and a depth of up to 3 mm are allowed without limiting the size along the major axis.

3. The stepson is allowed according to the norms of unfused knots. Not allowed in selected variety.

4. The size of a knot is determined by the distance between the tangents to the contour of the knot, drawn parallel to the longitudinal axis of the lumber. The size of an oblong and stitched knot on the faces of lumber and on all sides of the beams and beams is taken to be half the distance between the tangents drawn parallel to the longitudinal axis of the lumber.

5. In lumber longer than 3 m, it is allowed to have one knot of the size specified in the standards of the adjacent lower grade.

6. On a section of lumber with a length equal to its width, the largest sum of the sizes of knots lying on a straight line intersecting the knots in any direction should not exceed the maximum size of permitted knots.

Continuation

Notes:

1. Warp standards are established for lumber with a moisture content of no more than 22%. With higher humidity, these norms are halved.

2. Wood defects not mentioned in this standard are allowed.

2.7.1. Lumber for plating parts and connections of sea boats, boats of seagoing vessels, gliders, high-speed lake and river boats and sports vessels of the 1st class must meet the requirements of selected grade with the following additions:

the core part in the middle of the length of the lumber must be on the inner face: in the longitudinal sheathing - at least 50%, in the diagonal - at least 25% of the width of the face;

the dimensions of the fused, partially fused and unfused knots taken into account should not exceed 10 mm;

the number of fused knots taken into account should not exceed 1 piece. on any one-meter length of lumber, and partially fused, unfused - 1 piece, per 2 m length of lumber;

the knots taken into account are allowed no closer than 10 mm from the edges of the lumber;

pockets on the outer face of lumber are not allowed.

2.7.2. Lumber for decking of marine vessels must meet the requirements of select and first grades for external decks and first and second grades for internal decks with the following additions:

on the best faces of lumber with a width of up to 100 mm inclusive, intended for external decks, the sapwood part is allowed to be no more than 30 mm wide, and the surfaces of the faces must be sawn radially or close to it (without wedge cuts of annual layers);

the knots taken into account are allowed: fused - no closer than 10 mm, partially fused and unfused - no closer than 15 mm from the ribs of the outer face;

on the worst face and the lower halves of the edge area of ​​lumber, fused knots are allowed without limitation, and partially fused and unfused knots are allowed up to 1/3 of the width of the face;

cracks are allowed in lumber for external decks up to 1/4 of the thickness; for internal decks - 1/3 of the thickness of lumber. Cracks in deck lumber are not limited in length;

blunt wane is allowed in deck lumber with a size of no more than 5 mm;

cancer on the best faces and upper halves of the edge area, and pockets on the best face of lumber for external decks are not allowed;

core within the bottom half of deck lumber is permitted.

Note. The quality of deck lumber is assessed by the best face and the upper halves of the edge area.

(Changed edition, Amendment No. 1).

2.8. Lumber must be sorted by type of processing into edged and unedged, by size and grade (each grade separately).

At the request of the consumer, lumber can be sorted into groups of grades in accordance with the purposes established in the mandatory annex to the standard.

Lumber for export must be sorted in accordance with the order issued by the foreign trade organization.

Special shipbuilding - for plating and bracing of sea boats, dinghies, seagoing vessels, gliders, high-speed lake and river boats and 1st class sports vessels, flooring of external and internal decks of sea vessels

Agricultural machinery - for the manufacture of wooden parts of agricultural machines

Car manufacturing - for the manufacture of wooden parts for railway cars

Shipbuilding

Automotive industry - for the production of wooden parts for truck platforms, trailers and semi-trailers

Bridge construction, road transport

Construction and repair and maintenance needs, elements of load-bearing structures, parts of windows and doors, planed parts, parts of wooden houses, etc.

Production of various woodworking products, including furniture, staves for bulk and dry barrels, special containers

Container and packaging

For use on minor parts in construction, cutting into small workpieces for various purposes

Electronic document text
prepared by Kodeks JSC and verified against:
official publication
Lumber. Specifications:

Sat. GOST. - M.: Standartinform, 2007

6. The validity period was lifted according to Protocol No. 3-93 of the Mechanized State Council for Standardization, Metrology and Certification (IUS 5-6-93)

7. EDITION (September 2007) with Amendments No. 1, 2, 3, approved in December 1987, September 1988, February 1990 (IUS 3-88,1-89, 5-90)


An amendment was made, published in IUS No. 12, 2013

Amendment made by database manufacturer

This standard applies to lumber of coniferous species and establishes technical requirements for lumber intended for use in the national economy and export.

The standard does not apply to resonance and aircraft lumber.

(Changed edition, Amendment No. 3)

1. MAIN PARAMETERS AND DIMENSIONS

1.1. Lumber is divided into edged, unedged, boards, beams and beams.

Terms and definitions - according to GOST 18288.

1.2. Nominal dimensions of lumber and maximum deviations from nominal dimensions are in accordance with GOST 24454.

By agreement with the consumer, lumber with gradations in length, size and permissible deviations established in GOST 9302 and GOST 26002 are allowed for the domestic market.

(Changed edition, Amendment No. 2).

1.3. The symbol must consist of the name of the lumber (board, block, timber), a number indicating the grade, the name of the wood species (softwood - coniferous or individual species - pine, spruce, larch, cedar, fir), digital designation of the cross section (for unedged lumber - thickness) and designations of this standard.

Examples of symbols:

Board - 2 - pine - 32x100 - GOST 8486-86

Board - 2 pieces - 32 - GOST 8486-86

2. TECHNICAL REQUIREMENTS

2.1. Lumber must meet the requirements of this standard and be made from the following wood species: pine, spruce, fir, larch and cedar.

(Amendment. IUS N 12-2013).

2.2. Based on the quality of wood and processing, boards and bars are divided into five grades (selected 1, 2, 3, 4th), and beams - into four grades (1, 2, 3, 4th) and must meet the requirements specified in the table .

The purpose of various grades of lumber is given in the mandatory appendix.

(Changed edition, Amendment No. 1, 3).

2.3. Sawn timber of selected, 1st, 2nd, 3rd grades is produced dry (with a moisture content of no more than 22%), raw (with a moisture content of more than 22%) and raw antiseptic. During the period from May 1 to October 1, the production of raw antiseptic and raw lumber is allowed by agreement with the consumer (customer).

The moisture content of grade 4 lumber is not standardized.

Antiseptic treatment - according to GOST 10950.

2.4. The quality assessment of lumber, with the exception of deck timber, should be made on the face or edge that is the worst for a given board, and for square beams and beams - on the worst side.

2.5. The surface roughness parameter of lumber should not exceed 1250 microns for selected, 1st, 2nd and 3rd grades, and for 4th grade - 1600 microns according to GOST 7016.

2.4, 2.5. (Changed edition, Amendment No. 3).

2.6. Non-parallelism of faces and edges in edged lumber, as well as faces in unedged lumber, is allowed within the limits of deviations from the nominal dimensions established by GOST 24454.

2.7. Additional requirements for lumber intended for special shipbuilding

Norms for limiting vices

Notes:

1. Knots less than half the maximum allowed size are not taken into account.

2. In lumber with a thickness of 40 mm or more (with the exception of selected grades), oblong and stitched knots with a size along the minor axis of up to 6 mm and a depth of up to 3 mm are allowed without limiting the size along the major axis.

3. The stepson is allowed according to the norms of unfused knots. Not allowed in selected variety.

4. The size of a knot is determined by the distance between the tangents to the contour of the knot, drawn parallel to the longitudinal axis of the lumber. The size of an oblong and stitched knot on the faces of lumber and on all sides of the beams and beams is taken to be half the distance between the tangents drawn parallel to the longitudinal axis of the lumber.

5. In lumber longer than 3 m, it is allowed to have one knot of the size specified in the standards of the adjacent lower grade.

6. On a section of lumber with a length equal to its width, the largest sum of the sizes of knots lying on a straight line intersecting the knots in any direction should not exceed the maximum size of permitted knots.

Continuation

Notes:

1. Warp standards are established for lumber with a moisture content of no more than 22%. With higher humidity, these norms are halved.

2. Wood defects not mentioned in this standard are allowed.

2.7.1. Lumber for plating parts and connections of sea boats, boats of seagoing vessels, gliders, high-speed lake and river boats and sports vessels of the 1st class must meet the requirements of selected grade with the following additions:

the core part in the middle of the length of the lumber must be on the inner face: in the longitudinal sheathing - at least 50%, in the diagonal - at least 25% of the width of the face;

the dimensions of the fused, partially fused and unfused knots taken into account should not exceed 10 mm;

the number of fused knots taken into account should not exceed 1 piece. on any one-meter length of lumber, and partially fused, unfused - 1 piece, per 2 m length of lumber;

the knots taken into account are allowed no closer than 10 mm from the edges of the lumber;

pockets on the outer face of lumber are not allowed.

2.7.2. Lumber for decking of marine vessels must meet the requirements of select and first grades for external decks and first and second grades for internal decks with the following additions:

on the best faces of lumber with a width of up to 100 mm inclusive, intended for external decks, the sapwood part is allowed to be no more than 30 mm wide, and the surfaces of the faces must be sawn radially or close to it (without wedge cuts of annual layers);

the knots taken into account are allowed: fused - no closer than 10 mm, partially fused and unfused - no closer than 15 mm from the ribs of the outer face;

on the worst face and the lower halves of the edge area of ​​lumber, fused knots are allowed without limitation, and partially fused and unfused knots are allowed up to 1/3 of the width of the face;

cracks are allowed in lumber for external decks up to 1/4 of the thickness; for internal decks - 1/3 of the thickness of lumber. Cracks in deck lumber are not limited in length;

blunt wane is allowed in deck lumber with a size of no more than 5 mm;

cancer on the best faces and upper halves of the edge area, and pockets on the best face of lumber for external decks are not allowed;

core within the bottom half of deck lumber is permitted.

Note. The quality of deck lumber is assessed by the best face and the upper halves of the edge area.

(Changed edition, Amendment No. 1).

2.8. Lumber must be sorted by type of processing into edged and unedged, by size and grade (each grade separately).

At the request of the consumer, lumber can be sorted into groups of grades in accordance with the purposes established in the mandatory annex to the standard.

Lumber for export must be sorted in accordance with the order issued by the foreign trade organization.

2.9. The grade, nature of processing, size and type of wood must be indicated in the consumer specification.

3. ACCEPTANCE RULES AND CONTROL METHODS

3.1. Acceptance rules and control methods - according to GOST 6564.

APPENDIX (required)

APPLICATION
Mandatory

Electronic document text
prepared by Kodeks JSC and verified against:
official publication
Lumber. Specifications:

Sat. GOST. - M.: Standartinform, 2007

Revision of the document taking into account
changes and additions prepared
JSC "Kodeks"

This standard applies to lumber of coniferous species and establishes technical requirements for lumber intended for use in the national economy and export.

By agreement with the consumer, lumber with gradations in length, size and permissible deviations established in GOST 9302 and GOST 26002 are allowed for the domestic market.

1.3. The symbol must consist of the name of the lumber (board, block, timber), a number indicating the grade, the name of the wood species (softwood - coniferous or individual species - pine, spruce, larch, cedar, fir), digital designation of the cross section (for unedged lumber - thickness) and designations of this standard.

2.1. Lumber must meet the requirements of this standard and be made from the following wood species: pine, spruce, fir, larch and cedar.

2.2. Based on the quality of wood and processing, boards and bars are divided into five grades (selected 1, 2, 3, 4th), and beams - into four grades (1, 2, 3, 4th) and must meet the requirements specified in the table .

2.3. Sawn timber of selected, 1st, 2nd, 3rd grades is produced dry (with a moisture content of no more than 22%), raw (with a moisture content of more than 22%) and raw antiseptic. During the period from May 1 to October 1, the production of raw antiseptic and raw lumber is allowed by agreement with the consumer (customer).

2.4. The quality assessment of lumber, with the exception of deck timber, should be made on the face or edge that is the worst for a given board, and for square beams and beams - on the worst side.

2.5. The surface roughness parameter of lumber R mmax should not exceed 1250 μm for selected, 1st, 2nd and 3rd grades, and for 4th grade - 1600 μm according to GOST 7016.

2.6. Non-parallelism of faces and edges in edged lumber, as well as faces in unedged lumber, is allowed within the limits of deviations from the nominal dimensions established by GOST 24454.

Norms for limiting vices

2. In lumber with a thickness of 40 mm or more (with the exception of selected grades), oblong and stitched knots with a size along the minor axis of up to 6 mm and a depth of up to 3 mm are allowed without limiting the size along the major axis.

4. The size of a knot is determined by the distance between the tangents to the contour of the knot, drawn parallel to the longitudinal axis of the lumber. The size of an oblong and stitched knot on the faces of lumber and on all sides of the beams and beams is taken to be half the distance between the tangents drawn parallel to the longitudinal axis of the lumber.

6. On a section of lumber with a length equal to its width, the largest sum of the sizes of knots lying on a straight line intersecting the knots in any direction should not exceed the maximum size of permitted knots.

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