Many homes with adequate (or excessive) defensible space have still burned to the ground because embers have entered through attic vents,
ignited flammable materials around the home (litter in the gutter, wood stacks, wood fencing), or found their way under roofing materials.
Non-fire-retardant ACM cladding can potentially be a fire risk if the aluminium sheets are melted away by the fire, exposing a
flammable core
material that
ignites and spreads the fire more quickly.