this post was submitted on 11 Jul 2025
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I don’t remember seeing that before - must be humidity plus MDF trim. Neither wood nor MDF expands significantly from heat. Moisture, on the other hand, makes wood expand across the grain, not along it - so boards get thicker and wider, but not longer. MDF, however, swells in all directions when exposed to moisture. I'm surprised that this is the only piece affected though. Perhaps who installed it forgot to nail in the middle.