Selection criteria for class C timber

Class C timber selection criteria

Class C— a reserve of high-quality and experimentally promising timber intended for storage for20–50 years.

The main objective of class C is to form material for the next generation, test the suitability of various breeds for long-term anaerobic storage, and prepare the best batches for possible transfer to class B.

Class C is a working reserve that combines scientific experimentation with the practical use of wood.

1. Class C assignment

Class C timber is intended for:

construction and repair in 20–50 years;

furniture manufacturing;

carpentry and art products;

restoration of historical sites;

production of landscape architecture elements;

studying changes in wood during long-term storage;

testing new breeds and training methods;

formation of future class B parties;

creation of a regional material reserve.

Class C should include not only ideal barrels, but alsohigh-quality mass-produced material, suitable for controlled long-term storage.

2. Main breeds

Base breeds of class C

3. Experimental breeds

Class C allows for the inclusion of limited quantities of breeds for which there is not yet sufficient storage statistics:

ale;

fir;

pine of different species;

cedar pines;

beech;

birch;

alder;

poplar;

aspen;

slave;

the view;

sucker;

fruit trees;

large shrubs;

regional and exotic breeds.

Each experimental batch must have:

control group;

samples for intermediate extraction;

separate marking;

inspection plan;

criteria for early termination of storage.

A breed, method, or storage location that has not yet been tested must first be classified as Class D. They are upgraded to Class C after the first positive results are obtained.

4. Wood sources

5. Minimum dimensions

For class C, the dimensional requirements are lower than for class B.

For walnut, pear, maple, cherry, yew, boxwood and other valuable ornamental species, the minimum dimensions can be significantly reduced.

6. Barrel shape

Class C allows for a wider range of geometries:

straight trunks;

moderately curved;

forks;

naturally curved elements;

large branches;

root parts;

butt areas;

mouthguards;

growths;

areas with unusual swirls.

The material is immediately distributed according to its future purpose:

7. Acceptable quality

8. Invalid state

Class C does not accept wood:

with active destruction of most of the trunk;

with deep spreading rot;

with infestation by dangerous pests without the possibility of treatment;

with unknown chemical contamination;

impregnated with petroleum products;

with radioactive contamination;

with large through cracks that preclude useful use;

without confirmed origin;

threatening the storage ecosystem;

having great ecological value in the form of dead wood, snags or tree habitat.

9. Ecological filter

Before removing timber, its material and environmental value must be compared.

Wood remains in nature if it:

is a large natural snag;

creates shelters for fish;

supports the shore;

serves as a habitat tree;

has active hollows;

used by rare birds or mammals;

is an important substrate for fungi and insects;

retains water and soil;

does not pose a threat to people or infrastructure.

Only that portion of the material whose removal does not degrade the ecosystem is sent to the reserve.

10. Age of the tree

For class C, age is a less strict criterion.

Of primary importance are:

quality of material;

useful volume;

origin;

suitability for a specific storage method;

future demand.

11. Mandatory examination

For class C, a more economical control system is allowed than for A and B.

Mandatory minimum

visual inspection;

photo recording;

measuring length and diameter;

breed determination;

humidity assessment;

metal detector;

description of defects;

origin verification;

Timber ID assignment.

Extended verification

Conducted for C+ and valuable parties:

acoustic examination;

resistograph;

ultrasound;

tomography;

density determination;

dendrochronology;

genetic sample;

chemical analysis.

12. Point system

Decision based on the total score

13. Class C subcategories

14. Formation of parties

Unlike class A, class C should be stored primarily in batches.

Recommended batch

one breed;

one place of origin;

similar age;

close sizes;

the same preparation;

one storage location;

control samples;

the same verification period.

Batch size

A large batch of a new breed should not be planted until a small experiment has been successfully completed.

15. Preparation for storage

Before bookmarking:

the material is sorted by type;

garbage is removed;

metal testing is carried out;

damages are recorded;

the debarking option is selected;

the initial humidity is measured;

control samples are created;

an identifier is applied or installed;

the method of fastening is determined;

a location map is created.

16. Experiments with bark

For class C it is appropriate to compare:

complete preservation of the bark;

partial debarking;

full debarking;

end protection;

open ends;

different harvesting seasons;

wood after natural drying;

wood loaded immediately after harvesting.

The results allow us to improve the rules of classes B and A.

17. Selecting a storage location

Class C can be placed in:

specially created anaerobic tanks;

restored oxbow lakes;

flooded quarries;

experimental ponds;

controlled areas of reservoirs;

degraded swamps after environmental assessment;

closed technical pools.

Natural undisturbed wetlands should not be used as storage areas without an environmental impact assessment.

18. Storage conditions

Basic requirements:

constant immersion;

no drying cycles;

low oxygen content;

stable water level;

absence of strong current;

no contact with contaminated sediments;

protection against surfacing;

possibility of control extraction;

preservation of markings.

19. Control samples

For each party the following are created:

dry sample;

water sample;

sample in bottom silt;

sample with bark;

debarked specimen;

samples for extraction after 5, 10, 20, 30 and 50 years.

This allows you to compare:

strength;

color;

density;

stability;

biological resistance;

suitability for drying and processing.

20. Control schedule

For stable production batches, the frequency may decrease. For experimental breeds, it may increase.

21. Post-extraction evaluation

The control material is examined for:

color change;

scent;

humidity;

density;

hardness;

bending strength;

compressive strength;

impact strength;

shrinkage;

cracking;

quality of mechanical processing;

gluing quality;

ability to accept finishing coatings;

resistance to fungi;

suitability for construction;

artistic value.

22. Transfer between classes

C → B

A party is transferred to class B if:

maintains high quality after 10–20 years;

demonstrates a positive change in properties;

has stable storage conditions;

has high future value;

the main trunks show no signs of destruction;

It was decided to extend the storage period to 50–100 years.

C → A

A rare translation is possible for individual exceptional trunks if discovered:

historical value;

unique texture;

exceptional preservation;

scientific uniqueness;

storage possibility for more than 100 years.

C → D

The batch is switched to experimental mode if:

the data is contradictory;

change of conditions required;

new risks have been identified;

further storage is possible only for research purposes.

Early use

The material is extracted if:

destruction begins;

storage conditions become unstable;

wood is needed for an important project;

further storage does not improve quality;

It is necessary to free up an ecologically valuable body of water.

23. Class C Digital Passport

24. Difference between class C and B

25. Final requirements of class C

Class C timber must:

have a legitimate and understandable origin;

maintain useful volume;

be free from hazardous contamination;

be suitable for storage or experimentation;

have a clear future application;

obtain an individual or party passport;

have control samples;

be checked regularly;

stored without harming the natural ecosystem;

have a realistic prospect of use in 20–50 years.

The main principle

Class C preserves not only the best trunks, but also the knowledge of what the wood will become in one generation.

This is the most flexible class.DREVO Timber ReserveIt allows for the simultaneous creation of a practical stockpile of material, testing of new species, improvement of anaerobic storage technologies, and selection of the best batches for subsequent transfer to strategic Class B.

DREVO Timber Reserve