> A house can be thirty feet from an entire forest on fire and never burn down.
In zero wind. The fires in Santa Rosa were driven by 60 mph (100 kph) winds. Even 30 mph winds will pick up the top 15 meters of a burning Ponderosa Pine and carry it 400 meters away and start a new fire.
After the Santa Rosa fires I saw newspaper photos of melted barbeque grills. A fire hot enough to melt cast iron is going to light or melt any roofing material I can think of.
In zero wind. The fires in Santa Rosa were driven by 60 mph (100 kph) winds. Even 30 mph winds will pick up the top 15 meters of a burning Ponderosa Pine and carry it 400 meters away and start a new fire.
After the Santa Rosa fires I saw newspaper photos of melted barbeque grills. A fire hot enough to melt cast iron is going to light or melt any roofing material I can think of.