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The 45-50% humidity rule is a target, not a cliff

A close-up photo of a vintage acoustic guitar in a hard case, showcasing its elegant design and wood grain.

The belief: your acoustic guitar has to live at 45-50% relative humidity, and if the reading drops below that, the wood is about to crack. The reality: 45-50% is a target, not a cliff. Taylor and Martin both build their instruments in roughly 45-55% RH, and the practical safe zone is about 40-55%. A guitar sitting at 38% for a week is not in danger. What actually damages wood is extremes and rapid swings — a room that sits at 20-35% all winter, or a … Read the article