Hardwood cabinet components like face frames, doors, and headers are made of a natural material — wood — which has great character and personality. But natural wood also has some inherent limitations that should be understood. This is true of all wood in the home: furniture, millwork and cabinetry.
Unlike synthetic material, natural wood is not dimensionally stable, meaning it will expand and contract under certain conditions. Complicating matters further, wood does not expand and contract in a uniform way. It can even warp in extreme cases.