Humidity and Your Guitar:
Digital Hydrometer
Classical Guitars are quite fragile instruments. They are even more fragile that their steel string cousins. If you pickup a steel string guitar and then a classical guitar, you will see what I mean. The classical guitar top, back and side plates are thinner, the structural bracing is lighter and the tone bracing (fan braces) is very fragile. Therefore as the steel string guitar, at least the quality solid wood version is subject to damage due to low humidity conditions, the classical guitar is even more suseptable.
How Dry Air Affect Classical Guitars:
Excessive dry atmosphere can cause the following problems to even a very well-made guitar:
Cracks in the solid wood tops, backs and sides.
Bridge separation from the top.
Braces either cracking or coming loose or both.
Top warping or bellying.
Neck warping.
Change in string action.
Frets sticking out of edge of fretboard.
Cracks developing in fretboard.
It matters not if you have a $1,500 Rodriguez or a $25,000 Ramirez, the discovery of a major crack or other symptom as described above can be a very intimidating experience.
Cause of Low Humidity:
Most often low humidity is the result of cold air being heated up to room temperature by means of a gas flame in the furnaces of our homes, shops or offices.
Even though the humidity can be very high outdoors, such as 65 to 70%, the gas flames dry out the air and take almost every bit of moisture out of the air. This not only is devastating to our fine wood instruments, it is hard on the wood trim in our homes and offices and it creates an unhealthy atmosphere for us to reside. You nose dries out, skin becomes dry and itchy and you are much more suseptable to viruses, such as colds and the flu. Not to mention a home that is humidified is easier to heat and feels warmer with adequate humidity than one that is not.
Humidity Gage
Your Very First Step:
Your first step in correcting the humidity level in your home is to get a baseline of what the humidity level is in the area your instrument will reside. Once you know the humidity level, you can take the appropriate corrective action.
First, purchase a quality hygrometer or humidity gage. I prefer to use several of them in different areas of the house where my guitar is stored and played. Buy one with large digital output, and also will store high and low point humidity levels. If you have no humidity control in your home and you have either a gas fired furnace, or electric heat, don’t be surprised to see humidity levels as low as 10 to 15%
Here Are Some Good Hydrometers That You Should Consider:
Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
HygroSet II Adjustable Round Digital Hygrometer
Oregon Scientific BTHR968 Wireless Baro-Thermo-Hygrometer
What is the optimum Humidity Level?
For human habitation, a comfortable level will run fro 25 – 45%. You have to be a bit careful though, as you introduce more humidity into the enclosed space you can get too much moisture. What I mean is if you don’t have thermal pane windows or adequate moisture barriers in your walls or ceilings you could be sending excess moisture into the structure of your home which is not a good thing either. If you suspect this, I would humidify the home to a moderate level of about 20-25% and boost the humidity to 35% to 40% locally by use of a case humidifier or a soundhole humidifier.
Your guitar was most likely built in a shop or factory with very carefully controlled humidity. Most shops keep the humidity at about 40% or close to that so the guitar can exist in either higher or lower humidity conditions without damage.
How To Change Humidity Levels:
There are 3 method for you to address low humidity levels in your home or office
Whole Home Humidifier: Newer, quality built homes often have a humidification system installed on the return air side of the ductwork, very near the furnace. If yours does not I would have one installed and connected to a water source to be as trouble free as possible. You could easily get your level into the twenties with this system and you would have a much healthier home as a result.
Room Humidifiers:A second method is to do local humidification with room humidifiers. These are build for either a shop location or one or two rooms. They need more attention and constant filling, but can quickly raise the humidity locally.
In-Case Humidifiers: These type of humidifiers require that you mainly store you guitar in the case, which is not a bad idea. The only problem with this is I prefer to keep you guitars out and accessible to pick up and play at any time.
Case and Guitar Humidifier Recommendations:
Oasis OH-1 Original Guitar Humidifier
Oasis Guitar Humidifier and Hygrometer
Kyser Classic Humidifier
Oasis 6 Case Humidifier
It is often quite difficult to bring the humidity levels for a whole house system much past 25%. If you desire a higher humidity level for yur guitar, you should investigate either in-case or sound hole humidification system.
Some of these systems, such as the Oasis also include an in-case hydrometer which helps you keep tabs of the local humidity.
So pamper your classical guitar this winter, especially if you live in a cold weather state. Do yourself and your guitar a favor and keep your home humidified and avoid the dry air that is damaging and unhealthy.