Fire requires three components: fuel, ignition, and oxygen. Stress-skin panels have no "air" within their solid cores of insulation. The fire cannot "run up the wall" cavity even when balloon framed. Stress-skin panels have passed every standard fire test required of wood based or type V construction. A key element of fire safety is protection of the stress-skin panels and any other underlying structure with 15-minute thermal barriers, such as gypsum wallboard.