What specific bushfire attack level (BAL) ratings impact material selection for residential builds in regional Victoria?

In regional Victoria, all Bushfire Attack Level (BAL) ratings impact material selection, but the stringency increases significantly from BAL-Low. Specifically, BAL-12.5, BAL-19, BAL-29, BAL-40, and BAL-FZ (Flame Zone) directly mandate fire-resisting construction. BAL-12.5 typically requires elements like compliant external walls and sub-floor supports. BAL-19 and BAL-29 progressively demand greater fire resistance for external walls, roofs, windows, and doors, often requiring materials like treated timbers, non-combustible cladding, or toughened glass. BAL-40 necessitates substantial fire protection, including specific non-combustible or highly fire-resistant materials for all external elements. BAL-FZ, the most extreme, requires highly specialised construction techniques and materials designed to resist direct flame impingement and significant radiant heat flux.