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Закрити книгу / close this bookCarpentry for Vocational Schools - A Teacher's Handbook (GTZ; 252 pages)
Перегляд документу / View the documentPREFACE
Закрити папку / close this folder1. TIMBER
Перегляд документу / View the document1.1. Growth of a tree
Перегляд документу / View the document1.2. Timber conversion
Перегляд документу / View the document1.3. The air-seasoning of timber
Перегляд документу / View the document1.4. Shrinkage of timber
Перегляд документу / View the document1.5. Defects in timber
Перегляд документу / View the document1.6. Commercial size of timber
Перегляд документу / View the document1.7. Common timber
Перегляд документу / View the document1.8. Specification of material
Перегляд документу / View the document2. SCALES
Вiдкрити папку i переглянути змiст / Open this folder and view contents3. CONCRETE
Вiдкрити папку i переглянути змiст / Open this folder and view contents4. CONCRETE FORMWORK
Вiдкрити папку i переглянути змiст / Open this folder and view contents5. FOOTINGS
Вiдкрити папку i переглянути змiст / Open this folder and view contents6. TOOLS USED ON BUILDINGS
Вiдкрити папку i переглянути змiст / Open this folder and view contents7. FASTENERS
Вiдкрити папку i переглянути змiст / Open this folder and view contents8. FOUNDATION
Перегляд документу / View the document9. JOINTS
Вiдкрити папку i переглянути змiст / Open this folder and view contents10. BRACING
Вiдкрити папку i переглянути змiст / Open this folder and view contents11. WALLFRAME
Вiдкрити папку i переглянути змiст / Open this folder and view contents12. CEILING
Вiдкрити папку i переглянути змiст / Open this folder and view contents13. ROOFING
Вiдкрити папку i переглянути змiст / Open this folder and view contents14. WINDOWS
Вiдкрити папку i переглянути змiст / Open this folder and view contents15. OUTSIDE CLADDING
Вiдкрити папку i переглянути змiст / Open this folder and view contents16. FLOORING
Вiдкрити папку i переглянути змiст / Open this folder and view contents17. ELECTRICITY
Вiдкрити папку i переглянути змiст / Open this folder and view contents18. PLUMBING
Вiдкрити папку i переглянути змiст / Open this folder and view contents19. INSIDE CLADDING
Вiдкрити папку i переглянути змiст / Open this folder and view contents20. DOORS
Вiдкрити папку i переглянути змiст / Open this folder and view contents21. SKIRTING, ARCHITRAVES, CORNERSTRIPS
Вiдкрити папку i переглянути змiст / Open this folder and view contents22. PAINTING
Вiдкрити папку i переглянути змiст / Open this folder and view contents23. STAIRS
Вiдкрити папку i переглянути змiст / Open this folder and view contents24. HARDWARE
Вiдкрити папку i переглянути змiст / Open this folder and view contents25. WATERTANKS
Перегляд документу / View the documentBIBLIOGRAPHY
 

1.3. The air-seasoning of timber

The sawn timber has to be stacked for drying until its moisture content goes down to 15 percent.

Drying is by evaporation: the air is able to absorb moisture, and moving air dries more effectively.

An open, well-drained site should be selected, the foundations solidly laid with provision for cross and end ventilation, and at least 450 mm above the ground.

The boards should be stacked 25 or 50 mm apart to form vertical flues.

Each layer of boards is separated by spacing strips set from 600 to 1200 mm apart to enable fresh air to enter from the side. The spacing strips have to be set in a vertical row.

The quality of the lumber depends a lot on how it was stacked for seasoning.

A waterproof covering should be placed over the stack to protect it from sun and weather.

The time taken for air seasoning depends upon several factors, such as type of timber, size of boards, time of the year, site on which the stack is built, and the method of stacking. Roughly it takes about twelve month for each 20 mm timber-thickness.

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