Humidity of air in workshop.

[Sergy]

In my region abnormal high temperature.
Humidity of air the critical...
Yesterday's values of digital humidity gauge in workshop -

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It already today -

IMG_1952.JPG (44.63 KiB) Viewed 4882 times

What negative consequences can be for a tonewoods?

[charangohabsburg]

Hi Sergy,

Negative consequences may be splitting, if at all.

If the tonewood is already dry there will no be any issues. Ebony fretboards and bridge blanks are probably most prone to split when brought immediately from a humid environment to such a dry place. But dryness should not be a problem for already dry wood, it is the quick and big changes from humid to dry which are dangerous. In the room where Florinett (tonewood.ch) are grading their spruce tops, 6% RH is a good average in wintertime, but when it gets "really cold" (for Switzerland), RH drops even more, of course. Hardwoods are more problematic regarding RH changes, sealing the ends may be a must, depending on the type of wood and the place where the wood gets stored. Keep an eye on your ebony parts, especially bridge blanks which are critical regarding structural defects.

[Taffy Evans]

In Central Australia where I built I guitars, mandolins and dulcimers for over 20 years, the simple meter I had often did not even read on the scale. I f the guitars stay in the environment they were built in, not too much of a problem, it's when you send them to other climates and conditions that problems can occur.
I used to send instruments to Darwin on the coast and never had any problems reported. Drying out I feel is more damaging than absorbing moisture although any extremes and sudden changes will cause problems. I have always thought that building in and around 50% mc allows for movement either way when the instrument is transported.

[kiwigeo]

Drying out I feel is more damaging than absorbing moisture although any extremes and sudden changes will cause problems. I have always thought that building in and around 50% mc allows for movement either way when the instrument is transported.

This is the philosophy I adopt when adjusting humidity in my workshop.

[Sergy]

Hi Markus, hi Taff, hi Martin!
Thanks for all answers. It is the interesting information, and it gives positive mood.

Today weather has started to change - humidity 22 %.