Seasoning of timber and its necessity

Seasoning is the process of removing moisture (sap and water) from freshly felled timber to a suitable level (about 10-15% moisture content, or equal to the air-dry condition of the place of use) in a controlled way, so the timber becomes stable and durable.

Why seasoning is necessary

1. Reduces weight of timber, so it is easier to handle, transport and use.
2. Increases strength: dry timber is stronger, harder and stiffer than green timber.
3. Prevents shrinkage, warping and cracking after use: moisture loss is completed before fixing, so the shape stays.
4. Resists decay: fungi and insects need moisture (above about 20%) to live, so dry timber lasts longer.
5. Better for treatment: dry timber absorbs paint, varnish, polish and preservatives more easily and holds them.
6. Better for gluing and fastening: nails, screws and adhesives hold better.
7. Improves workability and finish; reduces electrical conductivity, and makes it lighter in colour.
8. Prevents fungal stains and gives a uniform appearance.

Thus seasoned timber is more economical, strong and durable.