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Avoid it? You can't. Wood, though it may seem dead, is alive. It moves around with changes in temperature and humidity. You can mitigate it by sealing the wood with a finish or even resin stabilizing it, but drastic changes in humidity or temperature will still result in movement, just the nature of the beast.
Best thing you can do is use stabilized wood, it moves the absolute least. If that's not an issue, make sure whatever you're using is plenty dry to start with, apply a decent finish (I like oil finishes for woods, i.e boiled linseed oil), and try to avoid drastic environmental changes
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