Benedetto The Signature of Jazz Guitar, Owner'S Manual & Warranty

Page: 8 / 28

6
Moisture Content & Humidity
Wood is a porous, organic material and is affected dimensionally by changes in the
amounts of moisture it contains. Fine guitars made from solid woods are, without
a doubt, more susceptible to the effects of changes in humidity than laminated
wood instruments and therefore require ongoing attention to their condition.
The moisture content of wood is determined by the relative humidity and
temperature of the surrounding atmosphere.
Relative humidity is expressed as a percentage of the air’s capability to hold
moisture. For example, 30% relative humidity means that the air is holding
30% of the moisture it could possible hold at a given temperature.
The moisture content for wood and the relative humidity for air are measured
quite differently. In wood, a 7% moisture content is present at 30% relative
humidity and 72° F temperature, (about 22.2° C).
Protection from Temperature & Humidity
The greatest threats to a fi ne wood guitar are extremes of, and rapid changes
in, temperature and humidity.
High humidity can cause softening of the glues used in the construction of
the instrument. Also, as the woods absorb moisture from the air, it can cause
the top and back to expand and rise — making string action high.