Petrifying process of wood

[Quentin Codevelle]

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Hi List,

Some months ago, we evoked the petrifying process of wood in the =
soundboard, resulting a loss of vibration ability, and thus a loss of =
power.

Where can I find another information about this?=20

Can this petrification be accelerated because of humidity and =
temperature conditions, or even because of the playing of the piano?

At what age can a soundboard be considered as "petrified", so that it =
has to be changed to get a good sound out of the piano?

Thanks,

Quentin

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