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Shofiuddin Rhidoy, Lecturer, Department of Civil Engineering, Dhaka International University, Seasoning of Timber

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What is seasoning of timber?, When a tree is cut down the wood contains a large amount of moisture. It would not be wise to use the wood in this wet state. The moisture must be dried out and the controlled pro­cess of doing so is called seasoning.

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How does moisture affect timber?, The water will affect timber in many ways, for example, Strength properties will be reduce, Fungal attack is over likely, The timber is vulnerable to some species of wood destroying insects, There excessive weight due to the amount of water present , The surface finish is unsuitable to receive either paint or polish, Adhesives will have minimal holding properties

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Methods of seasoning, There are two methods of seasoning:, air seasoning, sometimes called natural seasoning, , kiln seasoning.

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Air seasoning

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Air Seasoning- Advantages, Advantages of Air Seasoning, No expensive equipment needed, Small labor cost once stack is made, Environmental friendly-uses little energy

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Air Seasoning- Disadvantages, Disadvantage of Air Seasoning, It takes much longer than kiln seasoning, Large area of space required for a lot of wood, it is notable to produce timber not dry enough for use in the dry, centrally­ heated air of modern buildings

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Kiln Seasoning

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Kiln seasoning

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Kiln seasoning, Advantages of Kiln Seasoning, It is dries quickly, It can be controlled, Achieve a lower moisture content, Defects associated with drying can be controlled

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Kiln seasoning, Disadvantage of Kiln Seasoning, It is an expensive method, Requires supervision by a skilled operator, Uses a lot of energy

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summary