It is ember-proof. It is fire-proof if there is nothing hot enough to ignite the wood within 100 feet. It burns if you plant flammable shrubs right next to the house, or have a redwood deck that embers ignite. We have a fixation on defensible space here in California. If your house is not defensible, the firemen will just move on to the next house that is. They won't even try to save it because there talents are more useful at houses they can save.