Extreme humidity

[Kristinn Leifsson]

I tuned a piano today that hadn´t been tuned for 10 years.
It was practically at A 440!
Many ligaments (I like that) were swollen and stiff.  Well, I would be 
swollen and stiff if I was made of wood and felt and lived less than 3 
meters from 15 large pot plants, duh!

How much does the sound board have to swell in order for this to happen, 
and what is the highest pitch on a piano that you have encountered due 
to  such adverse conditions?

Note : I will be expecting scientifically researched answers only ;)



Thanks,

Kristinn Leifsson,
Reykjavík, Iceland


P.S.  For those of you still interested in "ze zcientific mezod" Czech ziz 
oot!

http://www.twinkiesproject.com/