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Posts posted by Tom West
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Bob: The back has gone concave because of a drop in RH(Relative Humidity). The back plates lost moisture and shrunk. When that happens the plate has to go flat or even concave. When building one has to control RH at about 40% or so. If the braces were glued with RH at 40% and it is now much drier you may be OK. Check your RH now with back concave. If you are at 40% or so, the news is not good. The braces should come off and be re glued at the correct RH. Sorry.
Tom
Engleman Or Sitka
in Acoustic and Hollowbody Guitar Chat
Posted
Bob: Looks like I am a bit late for these posts. Spruce is the wood for braces. The reason.................best stiffness to weight ratio. Although Cedar appears to be a good candidate, it has a few things going against it. Lower stiffness to weight then spruce. A bit more likely to be fragile and more likely to peel off ,IMO.
Tom