Why would forcing a controlled 25% compression set (even if it were possible) reduce the tendency for the board to expand and contract with humidity changes? That's not what compression set is. David Love davidlovepianos at comcast.net www.davidlovepianos.com I do not want a board with a lower amount of compression. I want a board that does not (can not in this case) react to changes in RH as much as a fresh panel does. Terry, I can understand that a panel with much compression set might be more prone to cracking in to handling, but cracks in a ribbed panel are due to cross grain strains against the restraining force of the ribs as the panel reacts to RH changes. Lower reactiveness to RH would then imply lower propensity towards either compression ridges or tension cracks and higher stablity. All other kinds of crack causing stresses are countered nicely already by the ribbing. Or what ? Cheers RicB
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