The humidity in your garage will be part of the answer. The strings' pressure on the board are the limit on how much the board can swell upwards with additional moisture content. When the board continues to take on moisture content after hitting this limit, it will start swelling into itself (read, compression ridges). My guess is that with no string load, the board will be free to swell up as much as is wants to, given the available humidity. I see no harm in this, now that you don't have to worry about compression ridges. The rim will be happier as partner to the board (and its expansions), now that it's no longer restrained by the plate.
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William Ballard RPT
WBPS
Saxtons River VT
802-869-9107
"Our lives contain a thousand springs
and dies if one be gone
Strange that a harp of a thousand strings
should keep in tune so long."
...........Dr. Watts, "The Continental Harmony,1774
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Original Message:
Sent: 05-20-2024 17:47
From: Chris Chernobieff
Subject: Is it safe to store a Steinway M on its side with all the strings removed? (Thinking of the soundboard mostly here)
Hmm....I thought removing the strings had the opposite effect.
I guess it depends on what wanted vs unwanted is. I'd hate to commit to answer because of terminology police.
-chris