Should I Worry About Ukulele Humidity?

OK, something that kind of gets my goat this one, and in danger of descending into a famous Got A Ukulele rant... Do you need to worry about ukulele humidity?

Why only a  potential rant Baz? Well, I realise that we live on a BIG planet and for many people, humidity is indeed a BIG problem with solid wood instruments. I suppose what started to get the hackles up with me was when I see people in the UK or other temperate climates worrying about humidity and, worse, still, spending money on gadgets to solve a problem that some bright spark convinced them was really needed. Not only can it be that case that in many cases such gadgets are completely unnecessary, but they can also cause as much damage the other way.

OK, back to basics. Humidity, or to be more precise 'relative humidity' is a measure of how much moisture there is in the air. The term 'relative' is an important one as humidity is measured as a percentage and it is not a measure of liquidity. A high humidity is something like 60 plus percent, but that doesn't mean the air is 40% away from being total water. That would be ridiculous (but if the science interests you, relative humidity is to do with the ratio of the  pressure of water vapour to that of water....)  . So anyway, I will cut to the chase and a 'good' relative humidity for musical instruments made of wood is anywhere between about 40-55% relative humidity. At normal temperature. (And that last bit is hugely important too...) It's a range. If you hit 39 or 56 you don't need to hit alarm bells.

But why does this matter? Well - wood is a natural material and changes in temperature and relative humidity can affect how the wood behaves - mostly in terms of expansion and contraction of that wood. You see  a wooden ukulele absorbs and releases moisture and, being a very technically built thing that relies on build accuracy for tuning, that absorption and expansion can affect various parts  that matter. In the simplest cases, it will throw tuning out, but in the worst cases it can BREAK an instrument.. fatally. But here is the important thing. Most people bang on about the perils of low humidity - but high humidity can also be a problem! Humidify a uke that doesn't need it and you can also damage it.

Before we get into the details, first of all a couple of circumstances in which you probably don't need to read on with..

1. Laminate instruments - generally speaking, high or low humidity is not going to damage these instruments. Sure, I say 'generally' but by that I mean, 'so long as you don't leave them out in the Nevada sunshine or under the dripping leaves of an Amazonian rainforest'. Pretty much all other normal circumstance - you will be fine and don't need to buy a humidifier device. In fact, if you are prone to leaving your instrument in the Nevada sun or in a rainforest, you have bigger issues to deal with in your ukulele life... Humidity mainly affects solid wood instruments.. (and no, all plastic instruments are not affected either...). Saying all of that, humidity, both high and low CAN affect strings and throw them out of tuning or intonation temporarily. Still, there is no real need to worry about humidity with a laminate unless you are at the extremes.

2. If you live in a temperate environment with a natural humidity in the 40-55 range. There is NO need to worry so long as you keep them stored carefully (more on that later). Bear in mind that includes HUGE swathes of planet Earth, most of Mainland Europe and large parts of the USA. I've owned solid wood guitars and ukuleles for over 35 years and have NEVER bought a humidifying device. Guess what? Never had a problem.  Never. But then I have treated them carefully... PLUS I live in a very temperate zone.

So, for many people these devices are just not required, yet shops and would be 'experts' will instil fear and worry into players which lead to a  bunch of risks - either spending money you don't need to spend on more 'stuff' or damaging your instrument because someone online said so. Taylor Guitars famously started including leaflets with their instruments because (I believe) people were taking bad advice, over humidifying their guitars, warping them then trying to claim on the Taylor warranty for their utter stupidity.

Yet, it must be said, many people DO live in areas of genuine low humidity. What can happen to a solid wood instrument if it is kept in such a place for a long time with no care?

Classic symptoms of a dry instrument may include:

- Strings getting closer to the fretboard (low action)
- A sunken top - the bridge area dipping
- Sharp fret ends
- Joints in the wood showing cracks
- Splits in the top of (or anywhere) on the body.

So for those people at risk, devices are available to put moisture back into an instrument. They are basically sponges, foams or gels that hold water and release it slowly over time, sitting in the case or in the sound hole (when in the case). Kind of like cigar aficionados use to keep their smokes in tip top condition. If you live in an area of low humidity I would naturally recommend them. But that is not really why I am writing this. You see, there are some other things you should bear in mind. Bear in mind that leaflet Taylor wrote..

Firstly, applying humidification to an instrument that is normally kept in a temperate environment (and therefore doesn't need it)  can also damage it really badly. If you have been applying humidification when you didn't need to you may note things like:

- Strings raising high in action
- Strings themselves going out of whack
- Swollen top and back of the instrument
- Warped necks
- Bad neck angles
- Lifting bridges, frets, joints etc

In fact - the same sort of damage as for a dry environment, only without the cracking - but damage all the same, and damage that can be just as irreparable. And it is much harder to revive an instrument that has taken on too much moisture!

But there is another factor that comes in to play - and that is temperature or rapid changes in temperature. No matter where you live you should treat your ukulele carefully and follow some rules. Rapid changes in temperature can kill an instrument, regardless of humidity. The rules seem obvious, but they are worthy of repeating:

- Keep a ukulele in a case whenever you can
- Do not store them in direct sunlight or next to a central heating source
- Do not store them in hot cars
- Do not store them in cold environments

If you do any of those, no matter what steps you have taken to protect against humidity issues, you are likely to destroy or at least damage an instrument if you then move it to an extreme the other way. The classic error is leaving a uke in the boot of a cold car then carrying it into a warm house or venue. CRACK! I've seen (and heard) that happen first hand.

But I digress... This was about people shilling the need for humidifiers that are not always needed and people ignoring the damage that can be caused with over humidification. So to sum up...

- If you think you have a humidity problem - buy a humidity reader and test it before doing anything else. They are cheap to buy. Don't assume you have a problem just because 'Bob the ukulele expert' tells you that you do. Don't humidify an instrument for the sake of it! Ever.
- If you check your relative humidity over a period and it sits in the range of  40-55 (ish) you are fine so long as your storage choice is sensible
- Don't keep the uke next to a heat source
- Don't keep the uke in extreme cold
- If you DO live in an area of low humidity - get a humidifier device. But DONT be tempted to if you don't.







© Barry Maz