Class B timber selection criteria

Class B timber selection criteria

Class B- is a strategic timber reserve intended for storage for50–100 yearsIts mission is to create material and cultural capital for children and grandchildren by preserving the best timber until their technical, historical, and artistic value increases significantly.

Class B does not include a single exceptional timber of class A, buthigh-quality, large and promising lots, suitable for architecture, restoration, furniture, shipbuilding, bridge structures, musical instruments and artistic processing.

Class B is the wood capital of the next century.

1. Main breeds

Top priority

The basis of class B should be:

oak;

larch;

the best batches of elm;

ash tree;

chestnut;

walnut.

2. Origin of wood

Class B timber is accepted primarily from sources that do not require special logging to create a reserve.

3. Minimum barrel dimensions

Dimensions are assessed relative to the tree species, region and age.

For walnut, pear, yew, maple and other valuable species, smaller sizes are allowed if the wood has high decorative or scientific value.

4. Barrel quality

5. Permissible defects

Class B shouldn't be reduced to a warehouse of only perfect logs. Some defects can enhance the artistic value of the wood.

Allowed:

moderate curvature;

curly grain;

burl formations;

wavy texture;

contrast nucleus;

old, overgrown lesions;

local mineralization;

inactive insect passages;

limited sapwood;

natural asymmetry.

Such wood is labeled as:

B-Art- artistic;

B-Figure- textured;

B-Curve- structurally curved;

B-Research- research.

6. Unacceptable defects

Class B does not include:

active deep rot;

destruction of a more significant part of the cross-section;

oil, chemical or radioactive pollution;

massive infestation of live pests;

large through cracks;

severe charring that destroyed useful volume;

unknown origin;

illegally harvested timber;

trunks that are of greater ecological interest in a river or forest than in a reserve;

wood that may pollute a water reservoir.

7. Age of the tree

Age is an important but not absolute criterion.

For class B, the combination of:

maturity;

the size;

density;

tree ring structures;

absence of critical defects;

Prospects after 50–100 years of storage.

8. Density of annual rings

Preference is given to wood:

with uniform growth;

without sharp multi-year jumps;

with a dense structure;

without prolonged periods of severe stress;

with a well-formed core.

However, very narrow rings do not always automatically indicate better quality. The following are evaluated:

breed;

place of growth;

mechanical properties;

proportion of late wood;

presence of tilt reactions;

internal stresses.

9. Genetic and historical value

Additional points are awarded to wood from trees:

disease resistant;

survived severe droughts;

survived fires or frosts;

grown up in extreme conditions;

belonging to a rare local population;

originating from the historical forest;

having a documented cultural history;

grown in a multi-generation agroforestry system.

However, the genetic value of a tree is not preserved by the timber alone. It is also necessary to preserve:

seeds;

fabrics;

DNA sample;

cuttings or grafts;

information about offspring.

10. Mandatory examination

Before including a barrel in class B, the following is performed:

11. Class B grading system

Each barrel gets points.

Solution

12. Class B subcategories

13. Storage Selection

Not every Class B wood is suitable for every swamp or pond.

The following are taken into account:

pH;

temperature;

oxygen content;

mineralization;

iron content;

depth;

water level stability;

sludge composition;

microbiological activity;

risk of flood runoff;

accessibility for inspection.

Example

14. Preparation of wood

Before bookmarking:

the trunk is identified;

a full examination is performed;

hazardous metal is removed;

the contaminated surface is cleaned;

the bark and sapwood are fixed;

the ends are documented;

a passive identification tag is installed;

the class and storage location are selected;

a fastening scheme is created;

floating, movement and friction of the barrels are eliminated.

Complete bark removal should not be automatic. The following batches are being compared:

with bark;

partially debarked;

completely debarked.

15. Digital passport

16. Control during storage

Controlled by:

water level;

oxygen;

temperature;

pH;

barrel position;

label state;

surfacing;

mechanical damage;

biological destruction;

change in mass and density of control samples.

17. Control samples

From each large batch the following are retained:

end sample;

cairn;

bark sample;

sapwood sample;

DNA;

dry control sample;

sample placed next to the trunks;

sample for periodic extraction.

This allows the material to be examined without raising the main shaft.

18. Decision on transfer between classes

Translation B → A

Possible if:

exceptional preservation confirmed;

the wood has acquired unique properties;

the trunk has historical significance;

the party demonstrates outstanding stability;

the shelf life is extended to 100–300 years.

Translation B → C

Possible if:

developing defects were identified;

storage conditions are unstable;

it is advisable to use the material earlier;

Further storage does not increase the value.

Exclusion from the reserve

Required if:

active destruction begins;

contamination detected;

the trunk threatens the ecosystem or structure;

traceability is lost;

storage became technically unsafe.

19. The main difference between classes

20. Final requirements of class B

Class B timber must:

come from a legitimate and documented source;

belong to a durable or particularly valuable breed;

have sufficient useful volume;

do not have critical active rot;

be compatible with the chosen storage method;

undergo an instrumental examination;

get a digital passport;

have control samples;

stored in a stable anaerobic environment;

be monitored regularly;

have a realistic prospect of use in 50–100 years.

The main principle

Class B is not a timber yard, but a managed portfolio of natural capital for 50-100 years.

It includes the finest lots of oak, larch, elm, ash, chestnut and walnut that are not exceptional enough for Class A but have a high probability of retaining or increasing their technical, artistic and cultural value over the next century.

DREVO Timber Reserve