Which is the optimal humidity level for a wood tub? Can I use one for outdoors?
You should pay attention to the following:
The wood is a natural material and is well preserved in a balanced environment. A moisture percentage of 50% is recommended.
- If there is scarce ventilation and the humidity is often over 70% your tub is likely to develop mold stains (which can quite easily be removed)
- On the other hand, if the environment is too dry (below 40% relative humidity) the tub may crack and cause leakings.
The dryness effects can be mitigated by using the tub daily or leaving it full of water when you leave home for longer periods. Dryness is harmful for wood. Avoid direct and prolonged sunlight exposure and if you have heating system in the bathroom, keep an eye on the hygrometer.
Yes, you can install the tub outdoors, but please avoid as much as possible direct sunlight exposure, expecially when the tub is empty.