It is wood, doing what wood does.
Wood is hygroscopic, meaning it will absorb moisture and it will lose moisture. When wood absorbs moisture the cells, sometimes called vessels, swell, also called expand. With a loss of moisture they shrink, also called contract. Humidity is moisture in vapor form. During acclimation of the flooring before installation, during the installation and long after the installation is complete, humidity plays an important roll in wood. In a consistent state of relative humidity, wood will not swell and it will not shrink. It does not gain or lose moisture content.
Acclimation of wood flooring requires the use of a calibrated invasive wood moisture meter to determine the wood flooring's moisture content upon delivery of the wood flooring to the jobsite also a thermal hygrometer to measure the jobsites temperature and humidity to verify it is not too dry or too moist, to allow proper acclimation to living conditions. Humans feel most comfortable with a temperature between 65º-75ºF and at a humidity level between 40%-55%RH. Acclimation of the wood flooring must take place within those perimeters, to achieve moisture content equilibrium, where it is no longer losing, or gaining moisture content.
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