Wood Moisture Content: An Introduction

Moisture Mapping is a valuable tool for identifying and addressing moisture issues in wood structures. It involves measuring the moisture content of wood to determine its susceptibility to rot, decay, and other problems. Understanding wood moisture content is crucial for proper maintenance and preservation of wooden structures.

Can Wood Contain Over 100% Moisture Content?

Yes, under certain conditions, wood can contain over 100% moisture content. This phenomenon is referred to as “bound water” or “fiber saturation point.” Bound water is tightly bound to the cellulose fibers of the wood and does not readily evaporate. It is the water absorbed into the cell walls of the wood, as opposed to free water, which is present in the cell cavities.

When wood absorbs moisture, it swells as the cell walls expand. Beyond a certain moisture content, typically around 25-30%, the cell walls become saturated and bound water content increases. This excess water can reach over 100% moisture content, but it remains tightly bound to the wood and does not affect its physical properties or strength significantly.