Why did medieval construction move from plank to panel?

• A. Oak and walnut are too heavy for plank construction
• B. Panels were cheaper to produce
• C. Planks were more prone to warping in damp conditions
• D. Carvers preferred the smoother surface of panels

Answer: (A)

Wood moves with humidity, and a flat, wide board tends to cup, twist, or warp when moisture levels change. Panel construction solves this by fitting a movable panel into a fixed frame. The frame holds the overall shape and joints the panel into place, but the panel itself can expand and contract within the grooves. This combination minimizes visible warping and cracking across the surface, which is why medieval craftsmen shifted from solid planks to framed panels. The weight of oak or walnut isn’t the decisive factor, and panels aren’t primarily chosen for cheaper production or a smoother surface—the practical benefit is better control of timber movement in damp conditions.