15th September 2025 How Do I Choose The Right Skirting Thickness for Curved Walls? Match skirting thickness to the curve’s radius – thinner boards bend more easily. 18mm polyurethane: bends to 400mm radius 24mm polyurethane: bends to 500mm radius MDF options require larger radii (500mm–1800mm). For tight curves, polyurethane is the most reliable choice.