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Why timber is used; seasoning method

Short answer

Timber is widely used because it is light, strong, insulating, renewable, workable, and economical. Seasoning lowers moisture to 10–15% by air drying (stacked with spacers under cover), water immersion, or kiln drying with controlled hot air, preventing decay and distortion.

Why and how is timber being widely used in all engineering works? Describe briefly the method of seasoning timber.

Why timber is widely used

Timber is used in all engineering works because it is:

  • readily available and renewable, and easy to cut, shape, join and finish with simple tools;
  • light in weight but has high strength-to-weight ratio, good in tension and bending;
  • a poor conductor of heat, sound and electricity, and so comfortable and insulating;
  • good at absorbing shock and vibration, and resistant to some chemicals;
  • cheaper than steel in many places (Nepal has plentiful forests), and attractive in appearance;
  • reusable and easy to repair, and suitable for doors, windows, roofs, floors, formwork, scaffolding, bridges and furniture.

Seasoning method (brief)

Seasoning removes moisture to 10-15% so that timber does not shrink, warp or decay.

  1. Natural (air) seasoning: the converted timber is stacked on raised platforms under a shed in a well-ventilated place, with spacers between the layers, for 6 months to 2 years.
  2. Water seasoning: logs are immersed in running water for 2-4 weeks to wash out the sap, then dried in air.
  3. Kiln seasoning: timber is stacked in a chamber with hot air of controlled temperature and humidity for 4-10 days; this is quick and controlled.
  4. Chemical and electrical seasoning are also used in special cases.

✓ Answer checked by Claude Opus 5.5 (high effort)

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