Humidity Factsheet

Guitars built with solid wood are sensitive to environmental humidity. Keep instruments in a stable environment to avoid structural movement and setup changes.

Recommended Range

• Maintain 45% to 55% relative humidity (RH).
• Keep temperature changes gradual whenever possible.
• Use a calibrated hygrometer in your room and in your case.

If Humidity Is Too Low (<40% RH)

• Top and back can shrink or crack.
• Frets may protrude (fret sprout).
• Neck relief and action can change quickly.

If Humidity Is Too High (>60% RH)

• Top and back may swell.
• Action can rise and intonation may drift.
• Long-term structural stress may increase.

Best Practices

• Store your instrument in its case when not in use.
• Use case humidification or room humidification during dry seasons.
• Avoid direct heat sources and direct sunlight.
• Schedule seasonal setup checks.