Low risk, no special construction needed.
Low risk, possible ember attack. Specific building rules apply.
Moderate risk, ember attack, burning debris, and heat exposure. Construction rules apply.
High risk, greater chance of ember attack, debris, and higher heat exposure. Special construction needed.
Very high risk, with increased danger from embers, debris, heat, and possible flame exposure. Construction rules required.
Extreme risk, with a high chance of flames, embers, debris, and intense heat. Strict construction requirements apply.