Defects in Timber

Defects due to Conversion and Defective Seasoning: the converted timber may warp and twist in various directions If seasoning is not uniform,. Sometimes honey combining and even cracks appear. In case of kiln seasoning this type of defects is more susceptible.

In the procedure of converting timber to commercial sizes and shapes the following types of defects are likely to arise: torn grain and chip marks etc.

Defects due to Fungi and Insects Attack: Fungi are minute microscopic plant organism. In wood they grow if moisture content is more than 20°C and exposed to air. rotting of wood occur Due to fungi attack. Wood becomes weak and stains appear on it.

Beetles, termites and marine borers (white ants) are the insects which eat wood and weaken the timber. Some woods such as teak have chemicals in their compositions and resist such type attacks. by chemical treatment Other woods are to be protected