Moisture in timber can be present either in the cell cavities or in the cell walls. The former is known as moisture or free water and major part of moisture in timber is present as free water. The latter is known as bound moisture and it is closely associated with the body of timber.
When timber containing moisture is exposed to the atmospheric conditions, it starts losing moisture content. Free water is evaporated first the point at which the cell cavities no longer contain free water is known as fibre saturation point. After the fibre saturation point has been reached, the tendency of timber to shrink appears and it IS more or less proportional to the loss in bound moisture.
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